Re: (RPi) db> reboot -> cpu_reset failed

On 1/5/23 16:23, Bjoern A. Zeeb wrote:
> On Thu, 5 Jan 2023, Klaus Küchemann wrote:
> 
>> Hi Björn,
>> ( ..I had a JTAG setup on the PI, but didn’t use it for some time..)
>>
>> yes that was a  "live“ boot example from today of the cm4(on orig. 
>> I/O-board),
>> it hangs while initializing sdhci, while the boot partition is living 
>> on the emmc :
>> —
> 
> Ok, I am just wondering given reboot works fine why reset in db>
> wouldn't.  Given you have JTAG setup you can probably debug a lot better
> than me but also you seem to have a different problem ...  too many
> problems too short time *sigh*
> 
> 

The reason for the difference in behaviour here is that the ddb reset 
command doesn't execute the full list of registered shutdown handlers, 
it just calls cpu_reset() directly. For whatever reason your combination 
of RPI hw+fw doesn't support the PSCI shutdown interface, so cpu_reset() 
fails. I am guessing that it is the bcm2835_watchdog driver that handles 
the normal reboot.

I think it should be just fine to execute such handlers from ddb reset, 
so you can try my patch: https://reviews.freebsd.org/D37981

Cheers,
Mitchell