[PATCH 2/2] Add two architectures which can detect the reset source

[Juergen Beisert]

Hi Sascha,

Sascha Hauer wrote:
> On Thu, Jun 21, 2012 at 11:16:18AM +0200, Juergen Beisert wrote:
> > These are examples how to provide the reset source. Not really tested on
> > the corresponding hardware yet.
>
> I did. On i.MX1 it does not work. The reset source register is not
> inside the watchdog module, but at 0x0021b800 (Reset source register,
> RSR)

Hmm, in my old MC9328MX1 manual the watchdog register at 0x201008 (=Watchdog 
Status Register) reports in bit 0 (=TOUT) if the watchdog timed out.

But the RSR seems a more reliable source to read the status.

> On i.MX27 it correctly detects a watchdog reset but not a power on
> reset. On i.MX27 it must be:
>
> #  define WDOG_WRSR_EXT (1 << 3)
> #  define WDOG_WRSR_PWR (1 << 4)

Ups, sure. "not really tested"...I told you so ;)

> i.MX51 does not seem to have a power-on-reset bit, at least not in the
> watchdog module. I didn't check the other i.MXs

Time for a #ifdef hell?

jbe

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