--- Log opened Wed Mar 16 00:06:27 2011
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11:42 < bcoco85> Data abort
11:42 < bcoco85> at 0800064A8
11:42 < bcoco85> FSR 0x5
11:42 < bcoco85> (domain 0, fault 5)
11:42 < bcoco85> address 0x52D63E70
11:46 < bcoco85> oh
11:46 < bcoco85> i got this while unplugging usb
11:46 < bcoco85> sometimes i notice that rockbox freezes when changing volume
11:49 < TheSeven> bcoco85: which exact rockbox revision=
11:49 < TheSeven> s/=/?/
11:51 < bcoco85> the volume change freezes happened with latest versions
11:51 < bcoco85> vaious of them
11:51 < bcoco85> im now with latest rockbox build
11:51 < bcoco85> and minutes ago i touched the volume wheel and freeze
11:53 < TheSeven> i need to know the exact revision that produced that "data abort" message
11:53 < bcoco85> TheSeven im trying to see what is the cause, but its difficult to replay the freeze because its very random
11:53 < bcoco85> ah ok
11:53 < TheSeven> and the "latest build" changes every few minutes to hours, so that often isn't specific enough either
11:53 < bcoco85> yep sorry.
11:53 < bcoco85> i said that because i just updated
11:53 < TheSeven> freeze while changing volume strongly smells like i2c trouble
11:53 < bcoco85> to r29598
11:54 < bcoco85> yep, version r29598
11:54 < TheSeven> i've seen that previously, but it seemed to be fixed
11:54 < TheSeven> ok, so the data abort happened with this version, or before you updated?
11:54 < bcoco85> after updating
11:55 < TheSeven> ok, i'll check that
11:55 < bcoco85> but
11:55 < bcoco85> there are some conditions can have influenced:
11:55 < TheSeven> how exactly does the volume changing freeze behave? does only the user interface freeze, or also audio playback?
11:55 < bcoco85> the volume change freeze freezes all: it makes ipod to play rave music
11:56 < TheSeven> hm, that's not i2c then
11:56 < bcoco85> the DATA ABORT issue:
11:56 < bcoco85> i was listening music while charging (not mounted)
11:56 < bcoco85> and suddenly freezed
11:56 < bcoco85> then rebooted with usb plugged
11:57 < bcoco85> and realised that it would mount so i unplugged
11:57 < TheSeven> before or after it switched to usb mode?
11:57 < bcoco85> this with version r29598
11:57 < bcoco85> rebooted with usb plugged in and boot rockbox
11:58 < TheSeven> i mean when exactly did you unplug it
11:58 < TheSeven> before or after the usb logo was shown?
11:58 < bcoco85> just when the usb cable image appeared on the screen
11:58 < TheSeven> ok
11:58 < TheSeven> i've never seen that cause a data abort, but all kinds of different trouble
11:58 < bcoco85> maybe the suddenly mount interrupt caused that
11:59 < bcoco85> im gonna try to make that crash again
11:59 < TheSeven> plugging-unplugging-plugging usb within about two seconds will kill it with ~90% probability
11:59 < bcoco85> i tried again and no luck
11:59 < TheSeven> if it's already transitioning between USB and non-USB state, and another plug/unplug event fires during the process, it will almost always go nuts in various ways
12:00 < bcoco85> yep
12:01 < bcoco85> i noticed that
12:02 < bcoco85> what drives me crazy is the random freezes while playing
12:02 < bcoco85> i cannot see what makes the freeze
12:02 < TheSeven> hm, that data abort (assuming you typed a zero too much in the first number, otherwise it doesn't make any sense) was in the buffering code, and looks like some structures in memory were overwritten with garbage
12:03 < TheSeven> so that also can be pretty much anything
12:03 < bcoco85> i decided to copy the message just because was strange
12:03 < bcoco85> it normally freezes
12:03 < bcoco85> with no message
12:04 < bcoco85> is there any way to see what is happening when the random playback freezes?
12:05 < bcoco85> would be helpful, rockbox hangs everdays mone than once a day!
12:05 < TheSeven> if it would be a panic, i could write some code to catch that and do a memory dump or something
12:05 < TheSeven> but this one apparently crashes it in way that it doesn't even detect
12:05 < bcoco85> supercrash
12:05 < TheSeven> one could maybe hack something up using a watchdog timer, but that's a bit complicated
12:07 < bcoco85> i would collect a lot of crash information if there is a way to catch that
12:07 < bcoco85> (i dont know what is a watchdog timer)
12:09 < TheSeven> every possible way to collect more information would involve massive changes to the rockbox code, for which I currently don't have enough spare time...
12:11 < bcoco85> in the debug menus... is there ant screen to see what is happening while playing? i would put that screen and wait for the creeze and handcopy the message
12:13 < TheSeven> the problem is, that even if some of those screens might show relevant information, it isn't very likely that it updates in the probably very short time span between the root cause / trigger and the actual crash (after which it will hang as well)
12:14 < TheSeven> the only screen that is likely to be relevant is the buffering debug screen, to check if rockbox was rebuffering while it crashed
12:14 < TheSeven> also it might be valuable information whether the hard drive is spinning or not after the crashes
12:15 < bcoco85> well
12:15 < bcoco85> if it helps..
12:16 < bcoco85> how can i identify if its rebuffering in this screen?
12:19 < bcoco85> maybe i can notice that if the ipod is doing little vibrations/noises
12:20 < bcoco85> in the buffering thread, how do i identify the rebuffering?
12:20 < TheSeven> it's mainly the "usefl" bar that's relevant there
12:21 < TheSeven> that's the amount of data left in the buffer
12:21 < TheSeven> if that gets very low, rockbox will spin up the drive and re-fill the buffer
12:22 < bcoco85> ah i understand now
12:22 < bcoco85> well, i will do what i can
12:23 < bcoco85> looking for that rebuffering issues
12:24 < bcoco85> thanks TheSeven
12:25 < kyle6513> So, TheSeven can you point me to a small example of the arm driver coding?
12:28 < TheSeven> of what exactly?
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12:51 < kyle6513> not sure, I was thinking I may be able to contribute in that way somehow, I've learnt a fair amount of python now. Not sure if I'd be ready for arm/driver coding, I just wanted to take a gander to see how much work would be involved
12:57 < TheSeven> kyle6513: well, one of the relatively simple drivers would be http://websvn.freemyipod.org/filedetails.php?repname=freemyipod&path=%2Femcore%2Ftrunk%2Ftarget%2Fipodnano2g%2Fi2c.c
12:58 < kyle6513> thanks, is that coded in c?
12:58 < TheSeven> yes
12:58 < TheSeven> all ipod-side code is written in C so far
12:58 < kyle6513> oh, I've learnt a little amount of c :)
13:00  * kyle6513 looks at the nand code and cringes
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17:20 < bcoco85> TheSeven it freezed again
17:20 < bcoco85> but i cannot notice if the HDD is spinning
17:20 < TheSeven> if it would be spinning you should be able to hear that
17:22 < bcoco85> also this time i forgot to set the buffering debug screen...
17:22 < bcoco85> fukc
17:39 < bcoco85> it was not spinning
17:39 < bcoco85> unluckily have no more info
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--- Log closed Thu Mar 17 00:11:03 2011