[U-Boot] enabling watchdog timer

[piper.guy1]

Much appreciated Alessandro. Some good info to go on. I forgot that u-boot
is a second stage bootloader under the 9260 environment, and that the
AT91 bootstrap program runs before it.

Regards,
/carl h.

On Thu, Feb 11, 2010 at 3:11 PM, Alessandro Rubini <rubini-list at gnudd.com>wrote:

> > I'm using an at91sam9260ek board. I configured a watchdog driver in my
> > kernel only to find out that u-boot turns it off.
>
> The problem with 9260 and friends is that the watchdog can be
> configured once only.  In my experience the best thing to do is
> leaving it unconfigured (it triggers in 13 seconds, more or less) so
> the kernel or application can configure it (either enable at a
> different timeout or or disable it).
>
> > The big top level README files says I need to define CONFIG_WATCHDOG, but
> > [...]
>
> I think you should grep around yourself. I did it with 1.1.5 and things
> are different now.
>
> > Also in 'README.at91', reference is made to make sure that the watchdog
> in
> > AT91Bootstrap is not disabled.  Where's 'AT91Bootstrap'?
>
> It is a separate package. An initial program loader that loads the
> real boot loader from nand or dataflash. You may be using it or not,
> you have to check that on your setup.  If u-boot is not programmed
> to offset 0 of your nand, you most likely have at91boot there.
>
> The stock sources of at91boot disable the watchdog, so you most likely
> want to change it.
>
> I used
> http://www.at91.com/repFichier/Project-209/at91bootstrap-2.3.tar.bz2
> and removed line 84 of board/at91sam9260ek/at91sam9260ek.c .
>
> After that, you'll want u-boot to trigger the watchdog without
> configuring it, unless you need a shorter timeout since the beginning.
>
> Hope this helps.
> /alessandro
>