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-l...@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 >
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