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IRC Log for 2011-08-02

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[00:03:26] * MrBabbage (dce9473f@gateway/web/freenode/ip.220.233.71.63) Quit (Quit: Page closed)
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[00:26:20] <gk__> what is the price of this panda board(OMAP4) in india/
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[00:30:36] <Henry_> Can someone direct me to the source code for Ubuntu 11.04?
[00:32:29] <prpplague> Henry_: try #ubuntu-arm
[00:32:47] <Henry_> Thanks.
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[01:07:29] <hank__> Hey,
[01:08:00] <prpplague> hank__: back again?
[01:09:10] <hank__> Yes, I am looking for Ubuntu 11.04 source code from the source tree but has no luck. Can you shine some light on that?
[01:09:42] <prpplague> hank__: join the #ubuntu-arm channel, you can also check the wiki pages on omapedia.org for links
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[01:34:43] <hank__> prpplague: what do you mean by 'join the #ubuntu-arm'? To create a login account?
[01:35:49] <prpplague> hank__: you are currently in #pandaboard, how did you join #pandaboard channel?
[01:37:26] <hank__> Oh, I am still in #pandaboard! My bad. I know how to get to #unbuntu-arm now. Thanks.
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[04:05:19] <Sonicadvance1> :|
[04:05:38] <Sonicadvance1> Is mmap memory access different on Panda than x86?
[04:10:22] <_av500_> why?
[04:13:49] <prpplague> Sonicadvance1: have a look at devmem2 - http://www.elinux.org/images/a/aa/Devmem2.c
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[04:14:45] <Sonicadvance1> _av500_, code not acting quite as I expect
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[04:33:46] <av500> prpplague: devmem2????
[04:33:49] <av500> Sonicadvance1: explain
[04:34:45] <prpplague> av500: as an example of using mmap from user space
[04:35:08] <av500> prpplague: how do you use mmap from kernel space? :)
[04:35:11] <ds2> devmem2 == the greatest security threat
[04:35:21] <av500> security?
[04:35:41] <ds2> with a carefully phrased set of arguements, one can destory hardware with the stroke of a carridge return
[04:37:14] <prpplague> av500: you don't but i wanted to be clear as to the purpose of the devmem2 example
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[04:45:40] <Sonicadvance1> av500, very complicated project, not entirely sure why it's failing atm actually >>
[04:46:12] <Sonicadvance1> Can only think of memory access differences
[04:46:49] <prpplague> Sonicadvance1: mmap really shouldn't be used other than for some serious debugging, other methods are available
[04:47:55] <Sonicadvance1> prpplague, porting a project that uses mmap in a similar way to the Windows function CreateFileMapping and it's sibling functions
[04:48:29] <prpplague> hehe, theres a problem from the very start, hehe
[04:50:05] <prpplague> Sonicadvance1: if you are trying to use a specific area of sdram for your application, you will need to set aside that area so that linux kernel knows not to use it
[04:50:52] <prpplague> Sonicadvance1: i assume you are wanting to deal with ram? is that correct?
[04:51:06] <av500> prpplague: what???
[04:51:13] <av500> prpplague: what is wrong with mmap?
[04:51:16] <Sonicadvance1> Of course :|
[04:51:42] <Sonicadvance1> mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
[04:51:59] <Sonicadvance1> and mmap(0, 0x31000000, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
[04:52:35] <Sonicadvance1> first using some temp space on a temp file in /tmp
[04:52:49] <av500> -1?
[04:53:41] <prpplague> Sonicadvance1: uh what?
[04:53:48] <prpplague> Sonicadvance1: none of that makes sense
[04:53:57] <Sonicadvance1> some implementations require fd to be -1 if MAP_ANONYMOUS (or MAP_ANON) is specified, and portable applications should ensure this
[04:53:58] <av500> CreateFileMapping looks just like mmap....
[04:54:41] <av500> Sonicadvance1: right
[04:55:00] <av500> basically you want to create shared memory?
[04:55:39] <Sonicadvance1> Indeed. This has been tested to work on x86 just fine :|
[04:55:55] <Sonicadvance1> and I had it working in a ARM VM at one time as well
[04:56:29] <av500> Sonicadvance1: but you are aware that you are trying to map 784MB?
[04:56:36] <av500> out of 1GB total mem
[04:56:39] <Sonicadvance1> right
[04:56:41] <av500> or maybe less
[04:56:50] <av500> right?
[04:56:55] <av500> does it work for less?
[04:57:10] <Sonicadvance1> would fail with less o_o
[04:57:16] <Sonicadvance1> the program that is
[04:57:28] <av500> but you expext linux to swap the mmaped region to disk or what?
[04:57:46] <av500> Sonicadvance1: well, then fix you program
[04:57:54] <av500> or solder more RAM
[04:58:32] <prpplague> Sonicadvance1: what are you setting as the offset?
[05:02:29] <TheSeven> btw, does anyone have an idea what the recent findings here could mean? https://bugs.launchpad.net/linux-linaro/+bug/709245
[05:02:36] <prpplague> Sonicadvance1: if you are setting it to 0 then it will map to the base of the all physical register space
[05:03:09] <Sonicadvance1> prpplague, Couple, 0x2000000, 0x40000, 0x2000000
[05:04:24] <Sonicadvance1> + couple mirrors
[05:04:26] <av500> prpplague: no
[05:04:59] <av500> prpplague: for MAP_ANON fd and ofs are ignored
[05:05:11] <prpplague> av500: ahh right
[05:05:31] <Sonicadvance1> We don't use offset for the mmap'ed space with MAP_ANON
[05:05:40] <prpplague> av500: i never use those options
[05:05:41] <Sonicadvance1> there are multiple spaces mapped here ;p
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[05:07:43] <prpplague> Sonicadvance1: what is this program suppose to do?
[05:08:31] <Sonicadvance1> http://dolphin-emu.googlecode.com
[05:09:00] <Sonicadvance1> trying to figure out what was so different between the Qemu ARM VM I ran vs pandaboard :/
[05:10:40] <prpplague> Sonicadvance1: got a link to the section of code you are working with?
[05:12:21] <Sonicadvance1> Basically the entire Interpreter CPU core >>
[05:12:22] <av500> Sonicadvance1: what about that tmp file?
[05:12:33] <av500> fd = open(ram_temp_file, O_RDWR | O_CREAT, mode);
[05:12:52] <av500> return mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, offset);
[05:13:19] <av500> if you only use that mem, linux will keep it in page cache anyway
[05:13:28] <av500> if not, you are out of mem anyway
[05:17:14] <Sonicadvance1> Well, it uses more. Most RAM it uses is virtual
[05:17:35] <Sonicadvance1> I think usually it caps at ~350MB of real RAM
[05:18:44] <Sonicadvance1> Running the program, I'm using 442MB/665.9MB
[05:19:06] <Sonicadvance1> Using Ubuntu 10.10 due to disk speed failure in 11.04 >>
[05:21:22] <av500> Sonicadvance1: so it works?
[05:21:48] <Sonicadvance1> eeehhh, it runs but is trying to HLE everything for some reason >>
[05:22:13] <Sonicadvance1> which is set via some bit or something? I can't remember
[05:22:31] <av500> HLE?
[05:23:19] <Sonicadvance1> High level Emulation
[05:24:02] <Sonicadvance1> It's what led me to believe that somehow memory access is slightly wonky
[05:27:10] <Sonicadvance1> Although maybe Panda is just slower than a QEmu ARM VM on a core 2 duo at 2.3Ghz :|
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[05:38:33] <TheSeven> hm, what's the difference between sudo ping -q -i.0099 localhost and sudo ping -q -i.0100 localhost?
[05:38:58] <av500> .0001
[05:39:18] <TheSeven> the first one causes a full core of CPU load, the latter one just 1%
[05:39:43] <TheSeven> the first one increases USB throughput by a factor of 5, the latter one just by a factor of 2
[05:40:14] <TheSeven> now what the hell is going on there?
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[05:41:18] <Sonicadvance1> at < 1/10second it requires high precision CPU work?
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[05:43:24] <TheSeven> the .0099 one sends roughly twice as many packets as the .0100 one
[05:45:59] <Sonicadvance1> low precision vs high precision?
[05:46:45] <TheSeven> also the packet count that the .0100 one produces is way too low
[05:47:17] <TheSeven> on x86, the packet counts seem to always be accurate, but .0200 uses 1% and .0100 uses 100% CPU
[05:47:43] <prpplague> TheSeven: the direction the debugging is going is that this is a thread issue, i suspect that the .0099 is just under the thread timing
[05:48:00] <prpplague> TheSeven: linaro folks and fedora folks are working on debugging this
[05:48:12] <prpplague> TheSeven: it doesn't appear to be panda or omap4 specific
[05:48:25] <prpplague> TheSeven: it has been recreated on the snowball and on a tegra platform
[05:49:22] <TheSeven> on x86 it's actually .0101 vs. .0100, which also auses a 30% jump in packet numbers and 100x jump in CPU usage
[05:49:49] <TheSeven> prpplague: any idea how this is related to the USB slowness issues?
[05:50:12] <TheSeven> a 100% CPU using ping seems to be a surefire way to improve USB speeds a lot
[05:50:45] <TheSeven> pinging the panda from some other machine with .0001 interval seems to help it as well
[05:50:46] <prpplague> TheSeven: like i said, right now the line of debugging is looking at some of the threads for usb operations
[05:57:02] <TheSeven> pinging it from a different machine with -i.01 already results in a 3x speedup, -i.001 results in a 5x speedup
[05:59:26] <TheSeven> .01 causes 1% cpu load, .001 causes 5% cpu load
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[06:00:39] <mturquette> prpplague: is CPUfreq enabled when you see this?
[06:01:12] <TheSeven> anything I could try to help debugging this?
[06:01:16] <TheSeven> nohlt didn't have any effect
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[06:01:48] <mturquette> i'd be curious if this same behavior was seen with performance CPUfreq governor.
[06:02:00] <mturquette> (versus some scaling governor like ondemand)
[06:02:24] <mturquette> i've observed that USB, WLAN and MMC throughput are all greatly affected by ARM frequency.
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[06:03:29] <koen> mturquette: ARM or L3?
[06:05:51] <prpplague> mturquette: i haven;t been following it too closely
[06:06:26] <prpplague> mturquette: https://bugs.launchpad.net/linux-linaro/+bug/709245
[06:06:39] <TheSeven> mturquette: how would I switch the governor? seems like the default kenrel is somewhat hardwired to ondemand
[06:06:47] <TheSeven> kernel*
[06:07:15] <mturquette> TheSeven: echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_governor
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[06:07:51] <Sonicadvance1> any news on getting SD card speeds faster? Compiling is terrible :/
[06:07:54] <TheSeven> there's no cpufreq in cpu, that's why i'm asking
[06:08:02] <TheSeven> er, in cpu??
[06:08:03] <mturquette> koen: ARM. You're right to think L3. I've seen all of the drivers I've mentioned hold bus tput constraints and still suck. Then ARM frequency goes up and *bam* good numbers.
[06:08:05] <TheSeven> cpu0*
[06:08:35] <mturquette> TheSeven: then how do you know that it is hardwired to ondemand?
[06:08:56] <koen> mturquette: I'm so used to omap3 where L3 gets outperformed by a piece of wet string
[06:09:38] <mturquette> optimized wet string.
[06:09:43] <prpplague> hehe
[06:09:43] * mturquette goes to bed.
[06:09:47] <prpplague> mturquette: laters
[06:09:53] <koen> 'night mturquette
[06:10:06] * prpplague should be sleeping as well
[06:11:00] <Sonicadvance1> Full recompile is agonizing
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[06:12:39] <koen> Sonicadvance1: crosscompile, much faster
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[06:14:15] <TheSeven> mturquette: hm, seems like cpufreq isn't supported at all with this kernel and freqeuency is fixed at 1GHz... so that can't be the culprit either
[06:14:22] <prpplague> in 10 years of doing arm dev under linux, i think i've done native compile maybe 5 times
[06:14:38] <prpplague> TheSeven: not nessarily true
[06:14:54] <prpplague> TheSeven: what kernel are you using? the old 2.6.35 ubuntu kernel?
[06:15:14] <TheSeven> $ uname -a
[06:15:14] <TheSeven> Linux panda 2.6.38-1208-omap4 #11-Ubuntu SMP PREEMPT Fri Apr 15 16:34:35 UTC 2011 armv7l armv7l armv7l GNU/Linux
[06:15:45] <prpplague> hmm, that should have had the scaling
[06:15:56] <prpplague> TheSeven: might try the 3.0 kernel and see how that performs
[06:15:57] <Sonicadvance1> koen, Thinking about setting up a shared folder and just compiling over the network >>
[06:16:03] <TheSeven> CONFIG_ARCH_HAS_CPUFREQ=y
[06:16:03] <TheSeven> CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
[06:16:09] <TheSeven> but nothing in /sys
[06:16:27] <TheSeven> prpplague: where can I find suitable 3.0 builds?
[06:16:52] <prpplague> TheSeven: on your harddrive after you download the source and compile it
[06:17:33] <prpplague> Sonicadvance1: why not just cross-compile?
[06:17:56] <Sonicadvance1> prpplague, sounds like a pain
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[06:18:03] <Sonicadvance1> distcc sounds easier >>
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[06:18:50] <prpplague> Sonicadvance1: hehe
[06:19:04] <Sonicadvance1> the six minutes of recompile time to test against something that I'm not quite sure how is failing is a bit annoying
[06:20:31] <prpplague> Sonicadvance1: cross compiling is pretty easy to setup
[06:22:43] <prpplague> Sonicadvance1: most people will setup a nfs share for your work area between your host pc and the target, cross compile on the host pc and drop the resulting binary over into the nfs share
[06:22:55] <prpplague> Sonicadvance1: then you just execute it on the target
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[06:25:59] <TheSeven> prpplague: hm, no testing packages somewhere?
[06:26:15] * dl9pf (~quassel@opensuse/member/dl9pf) Quit (Ping timeout: 252 seconds)
[06:26:19] <prpplague> TheSeven: i am sorry i did not understand your question
[06:27:20] <TheSeven> i had hoped to be pointed to some readily-made binaries... there just must be some of them somewhere :)
[06:27:37] <TheSeven> compiling linux myself isn't really fun, especially as I currently don't have the tools set up
[06:27:49] <prpplague> TheSeven: i am sure someone somewhere has some posted
[06:29:05] <TheSeven> but if cross compiling is easy to set up in your opinion, you can certainly point me to some howto?
[06:30:05] * rsalveti (~rsalveti@linaro/rsalveti) Quit (Ping timeout: 260 seconds)
[06:31:29] <prpplague> TheSeven: http://omapedia.org/wiki/Building_Android , http://www.elinux.org/Panda_How_to_kernel_new , http://omapedia.org/wiki/Ubuntu_kernel_for_OMAP4
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[06:33:00] <lnxy> Android even already has three toolchains installed. so you just need to adapt/set two envvars for compile
[06:34:00] <prpplague> TheSeven: http://omapedia.org/wiki/Android:_Configuring_the_Host_PC#ARM_Cross_Compiler
[06:34:20] <TheSeven> so i should use 2010q1 for 3.0 builds?
[06:34:23] <prpplague> TheSeven: those are easy to install and are good for newbies
[06:34:32] <prpplague> TheSeven: either one works
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[06:35:07] * prpplague has to get some sleep
[06:35:12] * prpplague is now known as prpplague_afk
[06:35:26] <TheSeven> which source would I use?
[06:35:43] <TheSeven> i'd assume that vanilla 3.0 would need some patches?
[06:35:59] <prpplague_afk> TheSeven: http://elinux.org/Panda_How_to_kernel_3_0_rel
[06:36:10] <TheSeven> thanks :)
[06:37:27] <LetoThe2nd> prpplague_afk: where can i get samples of this weeks ic? ;-)
[06:38:05] <LetoThe2nd> (gm BTW)
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[07:29:05] <kris> howdy
[07:29:51] <kris> is there a tutorial re: installing WLAN binaries in ubuntu?
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[08:04:26] <lnxy> av500: trying a kernel rebuild with code sourcery toolchain...
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[08:35:55] <janimo> Is anyone running Ubuntu Oneiric on their Panda and has graphics accelerarion (GLES2) working?
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[08:51:51] <TheSeven> hm, linux mainline with the patches from that wiki page applied fails to boot over here
[08:52:56] <TheSeven> both LEDs on, USB power off, no reaction on the serial port
[08:53:11] <TheSeven> the last thing i get is "Uncompressing Linux... done, booting the kernel."
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[09:01:14] <Sonicadvance1> _av500_, prpplague_afk, found the error. one of the mirrored virtual mem spaces were being offset a couple thousand bytes. Threw everything off
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[09:07:45] <Sonicadvance1> Three minutes per debug run. Doing pretty good I think
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[09:20:28] * Topic is 'OMAP discussion & development on PandaBoard Platform | Site: http://www.PandaBoard.org | Paste @ http://pastebin.pandaboard.org/ |Wiki: http://www.omappedia.com/wiki/PandaBoard | IRC logs: http://www.pandaboard.org/pbirclogs/ | IRC Guide: http://tinyurl.com/ircsurvivalguide'
[09:20:28] * Set by orbarron!~orb@nat/ti/x-ztoqabxrceydslsj on Mon Jun 06 15:00:23 UTC 2011
[09:23:27] <Sonicadvance1> dolphin-emu-nogui: tpp.c:63: __pthread_tpp_change_priority: Assertion `new_prio == -1 || (new_prio >= __sched_fifo_min_prio && new_prio <= __sched_fifo_max_prio)' failed
[09:23:32] <Sonicadvance1> libc derped
[09:29:44] <Sonicadvance1> ARM not support std::thread correctly or something?
[09:34:48] <mru> which libc and gcc?
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[09:37:45] <Sonicadvance1> oh, guess we are using pthread still. but lemme check
[09:39:45] <Sonicadvance1> libc 2.12 and gcc 4.4.4-14ubuntu5
[09:50:49] <koen> heh, gcc 4.4
[09:51:01] <Sonicadvance1> :|
[09:52:45] <Sonicadvance1> It's a mutex failing for some reason
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[10:09:13] <smspillaz> hmm
[10:09:29] <smspillaz> so now I've got neither status1 nor status2 when I stick in a power supply of some sort :/
[10:09:41] <smspillaz> probably fried it for good this time
[10:15:52] <lnxy> av500: kernel from gitorious/pandroid boots now. get still tons of HDMI plug-in events and not screen image, but Android initializes itself.
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[10:18:25] <lnxy> TheSeven check the load address (printenv) - this was one problem with my Pandroid boot, the u-boot default was 82000000 and my kernel needs 80000000.
[10:18:37] <Sonicadvance1> I find it strange that running my application from gdb is actually faster than running it by itself :|
[10:19:23] <TheSeven> smspillaz: what did you do to it? this thing doesn't exactly seem to be easy to fry
[10:19:43] <TheSeven> lnxy: nah, it was just a broken kernel
[10:19:49] <TheSeven> after picking the right source, it worked
[10:21:34] <smspillaz> TheSeven: dunno, was installing ubuntu, screen blanked for an extended period, hit pwron_reset and it died pretty much
[10:21:53] <smspillaz> though I noticed that in order to get it to boot I had to wiggle the sd card around a bit
[10:22:26] <TheSeven> so even after a full powerdown it doesn't come up again?
[10:22:35] <smspillaz> nope
[10:22:38] <smspillaz> even with the sd card removed
[10:22:40] <TheSeven> how are you powering it?
[10:22:51] <smspillaz> 5v ac adapter
[10:23:00] <smspillaz> though, I tried usb as well and got nothing there
[10:23:25] <TheSeven> can you do some measurements?
[10:23:35] <TheSeven> for example camera connector pin 29 vs. 1
[10:23:42] <smspillaz> with a voltmeter?
[10:23:47] <TheSeven> should read 4.22V
[10:23:50] <smspillaz> ok
[10:23:57] <smspillaz> hang on, I'll see if I've got one around
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[10:32:01] <smspillaz> TheSeven: eh, not one that works sadly
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[10:39:37] <smspillaz> TheSeven: I'll try to get a working voltmeter tomorrow I guess. I suppose the lesson here is "be more careful?" :p
[10:39:58] <TheSeven> tbh I've done way worse things with my panda, and it's still alive :)
[10:40:12] <Sonicadvance1> std::lock_guard fail
[10:40:53] <TheSeven> smspillaz: have you even done anything nasty to it?
[10:40:58] <smspillaz> TheSeven: nope
[10:41:15] <smspillaz> TheSeven: I've removed and inserted the sd card quite a lot though
[10:43:32] <TheSeven> smspillaz: has this board been disconnected from power for a couple of minutes after it died?
[10:44:59] <smspillaz> TheSeven: yeah
[10:45:02] <smspillaz> still no luck
[10:45:16] <TheSeven> another thing you could try would be shorting pin 11 or 12 to pin 7 (gnd) on expansion connector B
[10:45:24] <TheSeven> that are the power/reset "buttons"
[10:45:36] <smspillaz> TheSeven: I'll give that a try
[10:46:08] <smspillaz> TheSeven: I know at least that my power supply makes a kind of high pitched sound like a circuit is actually being formed
[10:46:20] <smspillaz> (like does during normal operation)
[10:47:06] <TheSeven> the pin next to the tiwi module is pin 2
[10:47:56] <TheSeven> so you'd need to short one of the pins in the 4th column counting from the tiwi module to one in the 6th column
[10:48:58] <TheSeven> if you have the tiwi on the left, the top pin of the lower connector in the 6th column is reset, the bottom pin is power
[10:49:53] <smspillaz> tiwi being the wifi module ?
[10:50:16] <TheSeven> yeah, being marked "TiWi01-R2" or something
[10:52:00] <smspillaz> okay
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[10:52:20] <smspillaz> shorting pin 7, 8, 9, 10, 11, 12 ?
[10:52:34] <TheSeven> hm?
[10:52:40] <TheSeven> 7/8 (4th column) is gnd
[10:52:58] <TheSeven> 11 is reset, 12 is power
[10:52:58] <smspillaz> (hm?)
[10:53:02] <smspillaz> oh ok
[10:53:23] <smspillaz> so we only want to short 12
[10:53:26] <TheSeven> so you would short 11 to 7/8 or 12 to 7/8
[10:53:37] <smspillaz> ah ok
[10:53:54] <smspillaz> so sticking a paper clip between 12 and 7 for example
[10:54:14] <TheSeven> yeah, but make sure that you don't accidentally touch any other pin with it
[10:54:22] <Sonicadvance1> Maybe I should run this GC emulator in Dual Core mode. FPS: 0 - VPS: 0 - Speed: 0
[10:54:22] <TheSeven> and better count pin numbers twice :)
[10:54:25] <Sonicadvance1> teehee
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[10:55:24] <smspillaz> TheSeven: so that pin marked J6 is pin 1 right?
[10:55:37] <TheSeven> exactly
[10:55:39] <smspillaz> and the one next to it (towards the tiwi) is pin 2
[10:55:40] <smspillaz> ok
[10:55:54] <smspillaz> and the one directly below pin 1 is pin2
[10:55:56] <smspillaz> right?
[10:55:59] <TheSeven> yes
[10:56:02] <smspillaz> err
[10:56:06] <smspillaz> ping3
[10:56:09] <smspillaz> pin3
[10:56:18] <smspillaz> so something like
[10:56:22] <TheSeven> pin 3 is to the right of pin 1
[10:56:30] <TheSeven> pins 1-8 are USB ports btw :)
[10:56:46] <smspillaz> ah
[10:56:48] <smspillaz> hang on
[10:56:55] <smspillaz> so it goes
[10:57:06] <smspillaz> tiwi | pin 2 | pin 1 | j6
[10:57:10] <smspillaz> then
[10:57:25] <smspillaz> | pin 4 | pin 3 |
[10:57:26] <smspillaz> right ?
[10:57:29] <TheSeven> yep
[10:57:36] <smspillaz> so 3 is below 1
[10:57:48] <TheSeven> if you have the connector on the right side of the board, yes
[10:57:58] <smspillaz> yeah
[10:58:01] <TheSeven> (ethernet etc. facing towards you)
[10:58:18] <TheSeven> or facing downwards, depending on your point of view
[10:58:23] <smspillaz> yeah
[10:58:28] <smspillaz> and I want to go from 7 to 11
[10:58:35] <smspillaz> err
[10:58:38] <smspillaz> 7 to 12
[10:58:50] <TheSeven> the first thing I did when I got my board was soldering headers into these ports and connecting two little pushbuttons to certain pins :)
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[10:59:04] <TheSeven> yeah, or 8 to 12, doesn't matter
[10:59:44] <smspillaz> ok
[10:59:46] <smspillaz> I've got 7 to 12
[10:59:51] <smspillaz> and now just ... power in ?
[11:00:18] <TheSeven> first power it, then connect those pins for a second
[11:00:25] <TheSeven> behaves like a pc's power button
[11:00:52] <TheSeven> short "press" does power on or signal an event to the OS, 8 seconds press does a hard power off
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[11:03:31] <smspillaz> TheSeven: hmm, nothing
[11:04:33] <TheSeven> yeah, disconnecting power for a couple of seconds would usually reset the pmic anyway
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[11:04:57] <TheSeven> so now you'll probably need a voltmeter...
[11:05:13] <smspillaz> yeah
[11:05:20] <student_> can anyone help me out in telling me where are the drivers files related to audio in panda (i.e. twl6040)
[11:05:31] <smspillaz> TheSeven: alright, I'll give that a try tomorrow
[11:05:38] <TheSeven> or you could keep those pins connected for ~10 seconds with 5v connected and check if your PSU suddenly gets silent :)
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[11:06:33] <TheSeven> student_: there's a couple drivers/mfd/twl6030-*.c files
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[11:07:02] <TheSeven> oops, mistyped the number
[11:07:10] <TheSeven> this one looks better: /sound/soc/codecs/twl6040.c
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[11:07:50] <smspillaz> TheSeven: yeah, the power supply goes silent after 10 sec
[11:07:56] <smspillaz> bbiab
[11:07:56] <student_> TheSeven : thanks a lot, but there are few more files in sound/soc/codecs/twl6040*.c , can u tell me what those files deal with?
[11:08:17] <TheSeven> smspillaz: so the voltage regulators are apparently still working
[11:09:01] <LetoThe2nd> student_: there's exactly one.
[11:09:39] * jojobest (~joffrey@192.93.161.12) Quit (Ping timeout: 255 seconds)
[11:10:15] <student_> LetoThe2nd : yes theres a file sound/soc/codecs/twl6040*.c so what does this deal with, because i found 2 more files in drivers/mfd/twl6040*.c
[11:10:41] <LetoThe2nd> student_: mfd stands for multiple function device. go figure. :-)
[11:10:59] <LetoThe2nd> student_: besides, why not just open the files and see what they do? ;-)
[11:11:35] <TheSeven> student_: the mfd ones are twl6030
[11:11:48] <LetoThe2nd> (which is the power companion, IIRC)
[11:12:25] <TheSeven> yes, it is
[11:13:07] <TheSeven> smspillaz: so everything up to the twl6030 seems to be working...
[11:14:03] <student_> TheSeven : in mfd also we have twl6040 files, Yes i tried to figure out the difference between these two files, but the problem is that both the files have module_init(twl6040_codec_init)
[11:14:15] <student_> TheSeven : so i am not able to understand which actually is the driver file
[11:14:46] <LetoThe2nd> student_: your tree must be whacked, because in mainline there certainly is no twl6040* in mfd.
[11:15:06] <LetoThe2nd> gnah, my bad.
[11:15:20] <LetoThe2nd> mentally blank what i just said, please.
[11:15:34] <TheSeven> smspillaz: are you sure that your PSU is working correctly and can handle enough current?
[11:15:53] <TheSeven> noise coming from a PSU doesn't exactly sound good
[11:16:13] <TheSeven> when powering it through USB it doesn't work either?
[11:19:07] <LetoThe2nd> student_: looking into the files suggests that -core does probing, general functions and initialization, -irq does the irq handling, and the one in sound is plain audio handling. :-)
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[11:22:45] <TheSeven> hm, I don't have any drivers/mfd/twl6040* stuff in my 3.0 tree
[11:23:09] <LetoThe2nd> TheSeven: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=tree;f=drivers/mfd;h=f5bc67133730d838709b698f7a8e13639f8a3de2;hb=c027a474a68065391c8773f6e83ed5412657e369
[11:23:56] <smspillaz> TheSeven: through usb it doesn't work, the PSU is rated at 1A
[11:24:13] <smspillaz> TheSeven: this is a really high pitched noise btw :)
[11:24:37] <TheSeven> that's usually a sign of a rather cheap PSU :)
[11:24:38] <Sonicadvance1> smspillaz, have a pregnant cap in your PSU?
[11:24:47] <Sonicadvance1> super easy fix >>
[11:24:49] <smspillaz> TheSeven: it is a cheap PSU :)
[11:24:54] <smspillaz> Sonicadvance1: err, not sure what you mean ?
[11:24:57] * ZeZu (null@c-69-245-160-65.hsd1.in.comcast.net) Quit (Ping timeout: 255 seconds)
[11:25:06] <smspillaz> Sonicadvance1: TheSeven: it's a variable voltage PSU
[11:25:14] <Sonicadvance1> Nevermind me, I'm a crazy person
[11:25:17] <smspillaz> (since that's the only one I could find locally)
[11:25:31] <smspillaz> so right now it's on 5V
[11:26:21] <av500> and you put it to 12V if the board is naughty?
[11:26:32] <smspillaz> heh
[11:26:40] <smspillaz> no I wouldn't do that :)
[11:26:42] <TheSeven> av500: actually the board seems to be designed to even survive that
[11:27:29] <Sonicadvance1> Maybe I should just hook the board to 120volt just to make it stop being a pain in my butt >>
[11:28:13] <smspillaz> TheSeven: short of checking the voltage between pin1 and pin 29 and hooking up a jtag cable, I'm guessing this board is busted ?
[11:28:59] * smspillaz is not really an expert on electronics
[11:29:00] <TheSeven> the voltage is likely to be OK if the boards is responding to the power button
[11:29:09] <Sonicadvance1> av500, Panda hates recursive std::lock_guard queues. I'm going to blame you now >>
[11:29:12] <smspillaz> TheSeven: so something just came loose I guess
[11:29:26] <av500> Sonicadvance1: sure
[11:29:43] <TheSeven> smspillaz: possibly a broken pcb trace somewhere if you say that wiggling around the sd card slot did help earlier
[11:29:56] <av500> Sonicadvance1: but I smell C++ and thus just shrug
[11:30:07] <Sonicadvance1> lol
[11:30:23] <smspillaz> TheSeven: yes, it was often failing to boot the SD unless I wiggled it around a bit
[11:30:32] <av500> Sonicadvance1: I guess you need to put another wrapper around this mutex wrapper
[11:30:56] <smspillaz> TheSeven: yeah, the hardware power button seems to work at least too
[11:31:12] <Sonicadvance1> av500, apparently
[11:31:27] * Sonicadvance1 uses recursive spinlocks
[11:32:25] <smspillaz> TheSeven: rma then ?
[11:32:42] <TheSeven> smspillaz: probably
[11:32:54] <smspillaz> okay
[11:33:02] <TheSeven> there seems to be no obvious reason for this failure...
[11:33:11] <smspillaz> TheSeven: thanks for your help then anyways, at least I know that I have some grounds for an rma now :)
[11:33:16] <smspillaz> rather than "oh shit I broked it"
[11:33:39] <TheSeven> well, as I said, I've done way worse things to mine, and it's still happy
[11:33:47] <smspillaz> TheSeven: like ?
[11:34:43] <TheSeven> all kinds of touching the board while powered (esd risk), reverse polarity power supply, fiddling with internal voltages, ...
[11:34:58] <koen> ESD is a myth invented by 3M
[11:35:09] <koen> isn't that right av500?
[11:35:17] <TheSeven> it even survived -4V on Vbat for a couple of seconds (damn, that just shouldn't have happened)
[11:35:26] <av500> koen: yes, to sell more plastic bags
[11:35:51] <TheSeven> av500: and all those wrist belts!
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[11:36:10] <smspillaz> TheSeven: ok, rma request submitted
[11:36:15] <av500> TheSeven: they are secret employee tracking devices
[11:36:30] <TheSeven> :)
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[13:17:42] <student_> hello, i have to work on ALSA i am not able to understand how to start? can anyone provide me any suggestions?
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[13:21:51] <av500> student_: google?
[13:21:57] <av500> or #alsa
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[13:28:57] <student_> av500 yes i am trying to google it...but i am not able to understand how to set the input, output audio paths using ALSA , can u kindly suggest any help?
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[13:49:27] <chris__> [Froyo] Is anyone having problems with java script in the browser? When I have java script enabled the browser shutdown after a fex seconds. This only happens when there is a internet connection avidable
[13:49:55] <av500> if you have no internet, what would you browse?
[13:51:15] <chris__> i have internet but when I dissconnect the cable the browser works fine(it won??t shutdown)
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[13:51:48] <chris__> but when I have the cabel inserted then I have to disable the java script. Otherwise the browser will shutdown
[13:52:01] <av500> chris__: yes, but then your javascript has nothing to ajax around
[13:52:18] <av500> and froyo is so yesterday
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[13:53:53] <chris__> well I guess you have??nt seen the problem I describing. I will try out gingerbread later.
[13:54:14] <av500> your problem is javscript crashing the browser
[13:54:36] <av500> dm8tbr: dint you have that v8 issue?
[13:55:41] <chris__> av500: I know. But I??m trying to fix it with out upgrading everything to gingerbread.
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[14:09:51] <dm8tbr> av500: IIRC we had a full blown kernel panic
[14:11:37] <lnxy> hm... _loads_ of "omapdss DISPC error: sync lost digit" with L27.8.2. Any pointers?
[14:11:51] <mru> only null pointers here
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[14:18:27] <av500> dm8tbr: right
[14:19:06] <prpplague> lnxy: 27.8.2 has a ton of dss issues
[14:19:11] <prpplague> lnxy: try something newer
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[14:31:51] <lnxy> Weird: no wake locks for kernel-omap branch L27.8.2_panda... _really_ weird...
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[14:32:30] <lnxy> prpplague: any branch recommendation? (gitorious/pandroid/kernel-omap)
[14:33:32] <prpplague> lnxy: L27.12 is a good start or try the linaro branch
[14:35:24] <lnxy> prpplague: wanted to build Pandroid to get debug symbols for a demo. Looks like a major undertaking now. Hrm.
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[14:41:05] <TheSeven> prpplague: 3.0 shows the same behavior
[14:41:30] <prpplague> TheSeven: sorry, what behavior?
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[14:41:50] <TheSeven> the usb slowness one we discussed tonight
[14:42:13] <prpplague> TheSeven: ahh ok
[14:43:30] <prpplague> TheSeven: how about creating a wiki page on elinux.org or omapedia.org with your test procedures and results
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[14:48:01] <lnxy> ...just found the 27.10.2-P1 relnotes on OMAPpedia
[14:48:58] <prpplague> lnxy: http://omapedia.org/wiki/PandaBoard_L27.12.1-P2_Release_Notes
[14:49:55] <lnxy> prpplague: thanks!
[14:51:02] * prpplague wonders why the releases notes are so hard to find
[14:52:36] * lnxy has found http://omapedia.org/wiki/Release_Notes - via "What links here"
[14:55:54] <prpplague> lnxy: it is linked from the main omapedia wiki page
[14:56:00] <prpplague> lnxy: right there on the front page
[14:56:21] <prpplague> http://omapedia.org/wiki/Main_Page
[14:58:44] <lnxy> http://omappedia.org/wiki/OMAP_Pandroid_Main - no link or reference. I'll get an account to fix it.
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[15:06:29] <student_> hello...sorry for troubling you guys, i am trying to boot crane board, can anyone suggest me site where i can post my doubts. I tried booting up the crane board but its not happening at all...plz help me
[15:07:48] <prpplague> student_: might try the #beagle channel
[15:10:27] <lnxy> prpplague: added a note at the "OMAP Pandroid Main" page. Can hopefully save others some wasted time and effort. Thanks again!
[15:10:56] <prpplague> np
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[15:31:15] * lnxy is happy about a booting Linux kernel without HDMI errors
[15:31:54] <prpplague^3> lnxy: dandy
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[15:35:03] <TheSeven> prpplague: according to the bug report, nosmp bypasses the USB issues... is that valuable information?
[15:36:31] <prpplague^3> TheSeven: yea
[15:36:57] <prpplague^3> TheSeven: you should get a wiki page together either on elinux.org or omapedia.org with the info you have collected
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[15:37:31] <TheSeven> most of it is in the launchpad bug report currently... where exactly should I post that?
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[15:42:08] <student_> @prpplague : thanks for your response....actually i am unable to boot the crane board, i found a couple of groups where they posted that they are also unable to boot the crane board, but none of them posted the solution...a bit worried about booting crane board last couple of days...any suggestion
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[15:44:29] <LetoThe2nd> oO( "boot the crane board" 3 times in 5 lines, in the pandaboard channel. impressive. )
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[15:46:23] <janimo> rsalveti, do you know if latest panda/oneiric kernel no longer has EDID support in the omapdss? I cannot see that file in sysfs
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[15:46:51] <janimo> I am trying to debug why my monitor won't work via HDMI. It very seldom does
[15:47:25] <av500> student_: how about asking the people where you got the crane from?
[15:47:55] <TheSeven> janimo: you can get at the EDID data using i2cdump
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[15:48:12] <TheSeven> you might need to plug the monitor into the DVI plug for that to work though
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[15:49:02] <prpplague^3> student_: like i said, try #beagle , since the crane is an off shoot of their product line
[15:49:06] <janimo> Well, I can get the monitor EDID data if I plug it to my laptop (VGA). But I thought the Panda had edid files exposed, that's what I saw on a wikipage dealing with debugging panda/hdmi
[15:49:24] <janimo> TheSeven, I have no DVI plug though
[15:49:44] <TheSeven> i meant the DVI port on the pandaboard, instead of the HDMI one (both are actually HDMI sockets)
[15:49:45] <prpplague^3> TheSeven: you can create a page on elinux.org or omapedia.org for this issue and post info there
[15:50:00] <av500> janimo: cat /sys/devices/platform/omapdss/display1/custom_edid_timing
[15:50:11] <av500> no?
[15:50:12] <janimo> TheSeven, av500 thanks, I'll try that
[15:50:35] <TheSeven> the file listed on the wiki has been gone for quite some time now IIRC
[15:51:37] <janimo> av500, I have a file called timings there with content like this 23500,640/48/80/32,480/3/7/4
[15:51:52] <janimo> but no file with edid in its name. This is 3.0
[15:52:41] <prpplague^3> TheSeven: which file?
[15:52:48] <janimo> display1 looks better, actually represents what the monitor can do : 119000,1680/48/80/32,1050/3/21/6
[15:54:27] <av500> janimo: good
[15:54:28] <janimo> no activity n dmesg when pluggin the hdmi cable in/out of the two panda sockets
[15:54:46] <av500> janimo: sorry, no idea for 3.0
[15:54:54] <av500> it works for me with the ti patched .35
[15:54:56] <TheSeven> prpplague: /sys/devices/omapdss/display0/edid IIRC
[15:55:06] <av500> TheSeven: thats raw edid, no?
[15:55:21] <janimo> right, maybe there's a regression or yet unported feature in 3.0
[15:55:29] <TheSeven> not sure if it was really that file, but I remember looking for a missing file that was supposed to contain my edid info some months ago as well
[15:55:44] <janimo> anyway, I sometimes got the monitor active when rebooting, but it happens rarely
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[15:56:03] <janimo> no way to test graphics this way, I may need to use the beagle :(
[15:56:49] <av500> janimo: plug a standard 1920x1080
[15:56:55] <av500> they tend to work
[15:57:09] <av500> unless they are LG
[15:57:22] <av500> or glare at TI to get HDMI fixed
[15:57:42] <janimo> well I only have on e monitor (Samsung), not gonna get one just for the panda :(
[15:57:47] <TheSeven> s/glare at TI/poke rsalveti/? :)
[15:58:11] <av500> TheSeven: yes, but that "fix" is a "rewrite"
[15:58:27] <janimo> I think rsalveti knows about the issues, but if they are bugs needing to be chased down and fixed there's no trivial solution
[15:59:12] <janimo> at this point I would have liked to help debug, but even the files mentioned in the debug page are missing :)
[15:59:25] <TheSeven> yeah, tracking down why it didn't like my SHARP tv was fun, he helped me a lot :)
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[17:20:40] <newguy> hello 4 all. I have one question regarding pandaboard and DPI->flatlink interface.
[17:21:20] <newguy> Did somebody made any interface that can take 1920x1200 res with even/odd lvds channels ?
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[17:45:52] <gnif> hi all
[17:46:28] <gnif> I have an early adopters board that I am trying to use the usbboot from omap4boot
[17:46:45] <gnif> works fine to the point of uploading the image
[17:47:10] <gnif> but if I printf the read data in usb_read on the device, its just junk
[17:49:16] <gnif> this is the data that it supposedly received "00 00 01 00 00 28 00 1d 00 00 01 00 00 24 00 44 00 00 01 00 00 28 00 1d 00 00 01 00 00 24"
[17:50:07] <gnif> anyone have any ideas?
[17:55:51] <gnif> I would say that the DDR was not initialised properly, or something since the stage1 loader uploads and runs fine
[17:56:13] <gnif> *2ndstage
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[18:24:22] <milbert> After successfully running Ubuntu 11.04 and 10.10 on the board, I now am not able to boot into either OS after re-imaging the SD card. Has anyone had similar issues?
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[18:54:19] <GrueMaster> milbert: I have seen this on occasion. I usually end up writing /dev/zero * 2G to the SD then reflashing it.
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[18:56:08] <ds2> ]
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[19:05:26] * jayabharath intrigued by the graphic at http://thedroidguy.com/2011/08/exclusive-does-new-ti-image-point-to-omap-processor-in-first-ice-cream-sandwich-phone/
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[19:10:39] <prpplague> jayabharath: that graphic is kind of freaky........
[19:11:10] <jayabharath> he he ... :D
[19:14:16] <gnif> ok, I have back-ported all the omap4 detection and sdram initialisation from x-loader into omap4boot, but still having limited success
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[19:16:10] <GrueMaster> gnif: What issues are you seeing? I use usbboot a lot, pushing either an ubuntu kernel blob or u-boot with pxe support.
[19:17:06] <gnif> GrueMaster, when the image is uploaded to the pb, it receives junk
[19:17:32] <gnif> i threw a printf into the usb_read method, and the data received is rubbish
[19:17:43] <GrueMaster> Very odd.
[19:18:14] <gnif> yeah, i figured it must be my pb since its an early adopter board
[19:18:30] <gnif> since the ddr is lower spec in it
[19:19:03] <GrueMaster> I have an ES2.0, EA1, A1, and A2. All work here.
[19:19:09] <gnif> :(
[19:19:13] <GrueMaster> Try rsalveti's branch.
[19:19:28] <gnif> have tried both already
[19:20:42] <gnif> btw, usbboot is clocking the ram at 400mhz on all boards, which is wrong
[19:21:25] <gnif> EA1 is only 200mhz, and ES2.0 is 380mhz AFAIK
[19:22:48] <prpplague> TheSeven: ping
[19:23:00] <TheSeven> prpplague: pong
[19:23:24] <prpplague> TheSeven: can you pastebin me the exact procedure you are using to do your tests?
[19:25:24] <TheSeven> prpplague: http://paste.ubuntu.com/657440/ and http://paste.ubuntu.com/657441/
[19:25:24] <prpplague> Bryanstein: any new posts on your oscon presentation?
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[19:28:13] <prpplague> TheSeven: ok so you are running both of these scripts?
[19:28:29] <prpplague> TheSeven: do you have two example outputs with comparison values?
[19:28:29] <TheSeven> prpplague: the first one is what I used for my most recent tests, the latter one is just trying different block sizes for 10 seconds, i used that previously
[19:29:24] <prpplague> ugh, why the heck does paste.ubuntu.com require you to login to download as text
[19:29:51] <ds2> it is ubuntu...the experts at making things completely useless
[19:30:08] <prpplague> TheSeven: ok so you run the first script after starting a ping?
[19:30:20] <TheSeven> the first script does do everything by itself
[19:30:27] <TheSeven> (trying various background jobs)
[19:30:47] <prpplague> i must of opened then in reverse order
[19:31:16] <TheSeven> ah, right, i mixed them up
[19:31:34] <TheSeven> let me do a quick run
[19:31:56] <TheSeven> for nosmp everything was ~25MB/s, but wifi wasn't working...
[19:32:16] <TheSeven> i'll paste the without-nosmp behavior in a minute
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[19:33:53] <prpplague> TheSeven: and what kind of file did you use for the input?
[19:34:03] <TheSeven> just /dev/sda
[19:34:53] <prpplague> ahh
[19:35:41] <TheSeven> prpplague: http://paste.ubuntu.com/657445/
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[19:36:39] <TheSeven> for comparison, with nosmp every single value is in the 22-28MB/s range
[19:37:08] <GrueMaster> wow. Some disparity.
[19:37:43] <gnif> GrueMaster, would you be kind enough to test my mods here -> git://github.com/gnif/omap4boot.git
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[19:41:12] <GrueMaster> Sure. Might be a while though (Friday?). We are in the middle of release week testing and I am a bit occupied.
[19:41:26] <GrueMaster> But I will pull it down and get it built now.
[19:45:20] <gnif> thanks, no rush
[19:45:34] <gnif> i am off to bed, almost 6am here, whoops :)
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[20:04:24] <djc_> does anyone know how to enable openGL hardware acceleration on the board with ubuntu 11.04? I've installed the omap graphics extras, but my program is still reporting very low framerates
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[20:20:36] <TheSeven> prpplague: so did these results provide some new insight? :)
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[20:23:01] <prpplague> TheSeven: i am getting prepared to so a ETM trace on the cores
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[20:23:56] <prpplague> TheSeven: and for the nosmp test, you just passed the nosmp bootarg?
[20:26:10] <TheSeven> yes
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[20:28:59] <TheSeven> would be interesting to know why that bootarg breaks wifi though...
[20:31:23] <prpplague> TheSeven: interesting, have you run this test on an x86 pc?
[20:31:38] <TheSeven> no, didn't do that yet... should I?
[20:31:47] <prpplague> i just did
[20:32:05] <prpplague> the ping of local host has a similar improvement in performance
[20:32:11] <TheSeven> weird
[20:32:29] <TheSeven> on my natty headless system the very same drive gets 30MB/s consistently
[20:32:48] <TheSeven> I have no idea if this would go even further up if I would ping it though :)
[20:35:41] <Sonicadvance1> :|
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[21:27:30] <prpplague> nothing like a little heat - http://www.weather.com/weather/today/Dallas/DFW+Intl+Arpt+TX+USTX0328
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[21:33:19] <jayabharath> prpplague: yuck... I wont be suprised if someone open's up an office in antartica as the temperatures have gone up :)
[21:33:34] <prpplague> hehe
[21:34:09] <prpplague> jayabharath: i just went around the corner to the post office(hope my package arrives before USPS goes bankrupt) and let me tell you, it is HOT
[21:34:48] <ds2> you are not suppose to ship HOT products w/o hazmat packing!
[21:34:51] <prpplague> jayabharath: richard is going to do some ETM traces on 4430sdp with my test case for the SMP issue tomorrow afternoon
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[21:35:10] <prpplague> ds2: hehe
[21:35:26] <jayabharath> prpplague: richardw?
[21:35:37] <prpplague> jayabharath: yea
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[22:00:32] <prpplague> Alison_Chaiken: greetings earthling
[22:01:05] <Alison_Chaiken> Greetings prpplague. I come to y'all with a build error that has plagued me for hours: http://pastebin.pandaboard.org/index.php/view/26577164
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[22:01:53] <Alison_Chaiken> I can't get the Pandroid userland to build following http://www.omappedia.com/wiki/PandaBoard_L27.12.1-P2_Release_Notes#Create_Android_Rootfs_Directory
[22:03:04] <prpplague> Alison_Chaiken: try restarting the build without -j10 and see if it is a poorly done dependency
[22:03:08] <Alison_Chaiken> Methinks I must do something in files with mydroid/devices/ti/pandaboard that is not described in the instructions, but reading the Makefiles and guessing has not yet produced a working result.
[22:03:58] <Alison_Chaiken> Excellent idea! I take your point. But the result is, alas, the same.
[22:04:00] <prpplague> indeed possible
[22:04:16] <prpplague> Alison_Chaiken: i'm in the process of setting up the same build
[22:04:39] <Alison_Chaiken> If I didn't annoy you with dumb questions, you'd finish and know the answer.
[22:04:49] <prpplague> hehe
[22:05:03] <prpplague> Alison_Chaiken: no most likely someone else would get in line ahead of you
[22:06:25] <Alison_Chaiken> Bryanstein, I hope your Panda session at OSCON went well. Do I owe you an iso or somesuch? Sorry for disorganization, which persists.
[22:06:42] <Alison_Chaiken> BTW Bryanstein, Mark Terranova has some great photos of you from OSCON.
[22:08:15] <prpplague> Alison_Chaiken: didn't see any pictures of you with adult beverages
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[22:08:54] <Alison_Chaiken> prpplague, I had plenty of beverages at the Nebula party, but I somehow managed to keep away from Mark then.
[22:09:02] <prpplague> hehe
[22:09:51] <riot> whats the best way to speak to an atmega thats supposed to do sensor input? I thought of using rs232. Any better suggestions? I'd need rather high bandwidth, like 400 kHz i2c would offer (where to best connect i2c to?)
[22:11:19] <prpplague> riot: need to explain what you are trying to accomplish a little better. are you connecting a sensor to an atmega and then to something else like a pc?
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[22:13:06] <riot> i'll connect lots of sensors (voltage, temperature, windspeed, humidity, 9dof) to an atmega that samples data via i2c/spi and should be connected to the pandaboard. I want to read data from that atmega (preferrably in python, somehow) and send instructions for PWM-Outputs to the same chip.
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[22:13:38] <tecdroid> hey there
[22:13:48] <prpplague> riot: if you can get by with polling, uart is fine
[22:13:48] <riot> hiho =)
[22:13:53] <tecdroid> hey riot
[22:14:07] <prpplague> riot: if you need irq based, you probably want to use something else
[22:14:15] <riot> no, polling should be fine
[22:14:23] <tecdroid> why this prpplague ?
[22:14:29] <prpplague> riot: have a look at the schematic for the trainer board
[22:14:34] <riot> i'll just ask the controller wether it has any new data every few ms and distribute it
[22:14:39] <prpplague> tecdroid: i am sorry i did not understand your question
[22:14:41] <riot> trainer board.. eh... okay
[22:15:03] <prpplague> riot: http://www.elinux.org/BeagleBoard_Trainer
[22:15:05] <tecdroid> why just polling with uart? ?
[22:15:08] <riot> prpplague: tecdroid's a friend, we're constructing together :)
[22:15:14] <riot> prpplague: thanks.
[22:17:37] <prpplague> tecdroid: you can use uart with an irq for incomming data, however if you need for instance, an irq to be triggered the instance a specific datapoint is available, doing this via uart alone can introduce a lot of delay
[22:18:34] <Alison_Chaiken> prpplague, if you look in mydroid/build/ and subdirs, there are a lot of .mk files. In device/ti/pandaboard there are many identically named .mk files. Some file must have to get linked or copied somewhere, methinks, but I haven't been able to guess which.
[22:18:38] <tecdroid> which is quite normal in an interrupt driven system
[22:19:04] <prpplague> Alison_Chaiken: yea getting setup to do the builds now, making notes as i go
[22:19:34] <tecdroid> but this delay can't be very large
[22:19:53] <prpplague> tecdroid: depends on how well you implement the uart protocol
[22:20:33] <tecdroid> on which side? panda or the slave board?
[22:21:44] <prpplague> tecdroid: well based on the information you have given me, you will need to implement a protocol for your specific configuration, which means you will need to have some sort of client and/or driver on the linux side as well as an implementation of the protocol in the avr
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[22:22:40] <riot> i'm on the pandaside; I'd rather prefer talking to the external component via linux devices/drivers...
[22:22:59] <tecdroid> yes, my plan was to use an uart as tty, so i just have to implement some kind of shell in my avr
[22:23:45] <prpplague> hehe, you are still implementing a protocol
[22:24:13] * prpplague has had this conversation many times before
[22:24:21] <tecdroid> yes but i don't have to build an extra driver
[22:24:42] <tecdroid> or.. better, i don't have to implement a kernel space driver
[22:24:55] <prpplague> tecdroid: correct, but you DO have to implement the protocol
[22:25:40] <tecdroid> okay, that's right.. i just don't want to implement some hadware abstraction on the panda board..
[22:26:25] <prpplague> tecdroid: techincally that is what you are doing, just not in kernel space
[22:26:33] <riot> tecdroid: jeedi says: we linewrite from the atmel into rs232 and pump that stream to the pandaboard, linux manages io, i do "open('/dev/ttyS0', 'r')" and am happy with a blabbering stream of sensor data
[22:26:40] <ds2> implement SLIP
[22:27:14] <tecdroid> is there any device node for usart4?
[22:27:23] <prpplague> tecdroid: yes
[22:27:36] <prpplague> riot: ok, but you have to do something with the data
[22:27:44] <prpplague> riot: you have to decide on the format of the data
[22:27:50] <riot> prpplague: run a regexp on each line i received ;)
[22:27:56] <prpplague> riot: you have to consider what happens if it gets out of sync
[22:28:01] <riot> i'd love to get nmea-data ;D
[22:28:07] <ds2> ;2A;2A;2A;2B;2B;2B;2B;2B;2B;2A;2A;2A;2A;2A;2AHDLC like framing
[22:28:07] <riot> out of sync? to what?
[22:28:23] <riot> i thought the kernel would handle that..?
[22:29:07] <tecdroid> okay.. if there's a node i can open we can communicate through usart4. that's all i need to know. my avr board doesn't need any level converter to rs232 level
[22:29:11] <ds2> use HDLC and it will
[22:29:13] <prpplague> riot / tecdroid you guys doing this as a school project?
[22:29:29] <riot> prpplague: haha, no
[22:29:33] <tecdroid> no, i'm too old for school.. just nerding around
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[22:29:57] <riot> i'm too young for school. We're building an ARNV (Autonomous Robotic Naval Vehicle)
[22:30:28] <riot> or, at least we're trying =)
[22:31:02] <prpplague> riot / tecdroid hehe, you guys are in for some fun, your questions and planning, are extremely common with folks who are trying to integrate microcontrollers to larger systems running an OS
[22:31:53] <prpplague> riot / tecdroid you can do a data stream, but understand that will be polling based, and you have very little margin for error in the data
[22:31:54] <tecdroid> no, i just had one question.. there is a /dev/usart4- however it's named. so riot can talk to my avr
[22:32:13] <ds2> bah...trivial stuff. use what is avialable and stop reinventing the wheel
[22:32:28] <prpplague> tecdroid: depending on the system it will normally be /dev/ttyO3
[22:32:36] <tecdroid> okay, thanks :)
[22:33:17] <ds2> or use a slave setup with I2C or SPI
[22:33:38] <prpplague> ds2: yea there is already an avr lib for that
[22:33:55] <tecdroid> yes, i'm using peter fleury's lib
[22:34:30] <ds2> for which? (sorry, I am lagging by about 2 minutes; saturated link)
[22:34:36] <prpplague> ds2: hehe
[22:34:41] <tecdroid> i??c
[22:34:53] <prpplague> tecdroid: avr to linux lib?
[22:35:22] <tecdroid> no, just for i??c com to devices
[22:36:04] <prpplague> tecdroid: there is an avr lib specific done with an i2c protocol implementation for working with linux
[22:36:20] <tecdroid> but my i??c is already in use..
[22:36:28] <ds2> that sounds like master support... you want slave support on the AVR side
[22:36:32] <prpplague> tecdroid: anyway, feel free to drop in for questions, have a look at the schematics for the trainer
[22:36:41] <ds2> or bitbang with Linux as the master on SPI
[22:36:53] <tecdroid> yes, i'll do.. but now i need some sleep..
[22:38:39] <tecdroid> gn8
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[23:52:09] <Sonicadvance1> yay for Droid Bionic having same components as panda? :P
[23:59:00] * prpplague^2 (~prpplague@ppp-70-242-126-3.dsl.rcsntx.swbell.net) Quit (Quit: Leaving)

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