reset / watchdog on an imx7d soc

[Giorgio Dal Molin]

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.

giorgio


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