Hi Wolfgang,
> Dear Stefan Roese,
>
> In message <[email protected]> you wrote:
>>
>> > Also I would like to determine in u-boot if a
>> > reset was caused by the watchdog timer using the TSR WRS field. If it
>> > was reset by the watchdog we will boot into a failsafe partition to
>> > protect against system update errors.
>> >
>> > Has anyone done something like this?
>>
>> Such a detection is not implemented for PPC4xx. Not sure if it's implemented
>> for any other architecture.
>
> I think lwmon5 performs such checking; eventually this is buryied
> somewhere in the POST code.
Well, at least I know that for mpc5121 we read the reser status register
at boot and copy it to global data
(arch/powerpc/cpu/mpc512x/cpu_init.c:64). The value is also output in
the U-Boot prompt (arch/powerpc/cpu/mpc512x/cpu.c:68) which is a nice
thing IMHO.
Checking a "git grep reset_status" one can see that something similar is
done for other PowerPC cpus as well, so I'd suggest reusing this method
for ppc4xx and providing a mechanism to access this information from a
script.
Cheers
Detlev
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