On 09/23/2012 06:11 PM, Shilimkar, Santosh wrote:
On Sat, Sep 22, 2012 at 10:41 PM, Chris Hoffmann <chrmhoffmann@xxxxxxxxx> wrote:
On 09/22/2012 07:45 AM, Shilimkar, Santosh wrote:
On Sat, Sep 22, 2012 at 4:19 AM, Chris Hoffmann <chrmhoffmann@xxxxxxxxx>
wrote:
Hi,
We're trying to get a custom 4430 board (aka. nook tablet with OMAP4430
ES2.3 HS TWL6030 ES2.1) working with p-android-omap-3.0 on android jelly
bean. The board works quite well, but we experience random hangs and the
watchdog kicks the board to reboot.
On the same kernel, you should have support for the persistent log. You
might
want to check the output. That should give you pointers on what CPU was
doing before the freeze which resulted in reboot.
Hi,
I have some problems to provide logs. If I add -DDEBUG to cpuidle44xx.o the
problem doesn't seem to occur. It could be that printk-ing alleviates the
issue.
Also the watchdog seems to shutdown the device rather than rebooting it (or
it hangs?) and then I can't provide /proc/last_kmsg.
How could I provide more info?
Check if you have "/sys/kernel/debug/persistent_trace" available on
your kernel. This generally helps whenever there are hangs, the last
call stack is stored on memory and on the reboot it can be cat'ed to
see if some useful information about hang is available.
Hi Santosh, all,
the p-android-omap-3.0 doesn't have the persistent_trace but I was able
to backport it from 3.4 without major issues (only tricky part is that
in p-android-3.4 there's no apparent user of that device in omapzoom
kernel).
The problem is now that the omap-watchdog doesn't kick the device to
reboot but rather to shutdown, so I still have no trace. Soft-rebooting
shows that I can get persistent_trace.
Switching the persistent tracer to ecc=true does not help as it seems to
overload the device completely when activating the tracing.
Rgds,
Chris
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