reset / watchdog on an imx7d soc

[Giorgio Dal Molin]

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:

  Use the SNVS LPCR register to turn off the system power

It suggests to set the SNVS_LPCR[TOP] bit together with SNVS_LPCR[DP_EN], this
would mean something like:

# mw -l 0x30370038 0x00000060

But the effect of this write is to hang the soc.

The same happens with the Option 2 in the errata:

   Use SRC_A7RCR0[A7_CORE_POR_RESET0] to reset the ARM A7.

To do this I use:

# mw -l 0x30390004 0x00000003

but again the soc just hangs as with the watchdog.

giorgio

> On June 23, 2020 at 3:53 PM Fabio Estevam <festevam at gmail.com> wrote:
> 
> 
> Hi Giorgio,
> 
> On Tue, Jun 23, 2020 at 10:48 AM Giorgio Dal Molin
> <giorgio.nicole at arcor.de> wrote:
> 
> > Can anyone confirm that the current barebox is able to restart an imx7 soc without
> > using external signals ?
> 
> You really need to use the WDOG_B pin to trigger the reset due to an
> i.MX7 erratum.
> 
> Please check the i.MX7 errata document:
> https://www.nxp.com/docs/en/errata/IMX7DS_3N09P.pdf
> 
> Search for "e10574 Watchdog: A watchdog timeout or software trigger
> will not reset the SOC"
> 
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