reset / watchdog on an imx7d soc

[Ahmad Fatoum]

Hello,

On 6/29/20 12:53 PM, Giorgio Dal Molin wrote:
> Hi,
> 
>> On June 29, 2020 at 10:44 AM Ahmad Fatoum <a.fatoum at pengutronix.de> wrote:
>>
>>
>> Hello Giorgio,
>>
>> On 6/23/20 5:11 PM, Giorgio Dal Molin wrote:
>>> Hi Fabio,
>>>
>>> thank you for your quick reply.
>>>
>>> I've already found the errata you linked in your mail but I had no success
>>> applying the suggestion there; maybe I'm doing it wrong.
>>> Let's take the Option 3 there:
>>
>> Does reset within Linux (with say the imx_v6_v7_defconfg) work?
> 
> No. I see the same behavior also with the kernel: after a 'shutdown -r'
> the system 'goes down' but doesn't reboot, it just hang:
> 
> ~ # shutdown -r
> system is going down for reboot NOW
> ...
> [   46.248222] 000: ci_hdrc ci_hdrc.0: remove, state 1
> [   46.248253] 000: usb usb1: USB disconnect, device number 1
> [   46.248263] 000: usb 1-1: USB disconnect, device number 2
> 
> 
> The same happens if I kill the 'watchdog' process: after ~2 seconds
> the system just hangs.
> 
> I'm sure there must be a solution because the original u-boot bootloader
> for the cpu module I'm using reboots the system as expected, through the wdog1;
> unfortunately it's not so trivial to find what makes the difference.

Linux probably attempts reset via PSCI. Check for psci_system_reset
in your vendor's U-Boot and transplant it into barebox.

> 
> giorgio
> 
> 
>>
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