On Sun, Oct 09, 2022 at 09:12:25PM +0200, Pali Rohár wrote:
> Hello! Watchdog code seems to be broken in u-boot master branch.
> On Nokia N900 I'm getting following message in qemu:
> 
> cyclic function rx51_watchdog took too long: 10000us vs 1000us max, disabling
> 
> Seems that watchdog core code is not prepared for "slower" watchdogs
> which communicate over slower i2c bus, like it is the case for N900.
> 
> Disabling slower watchdog is a bad idea as it would result in reboot
> loop instead of slower - but working code.

So, looking at this in more detail, we have
CONFIG_CYCLIC_MAX_CPU_TIME_US as a configuration option (which is where
the too long comes from). And picking a random CI run:
https://source.denx.de/u-boot/u-boot/-/jobs/511177
I do see we hit this in CI once, but not every time, QEMU runs here. Is
that the max time is configurable enough to satisfy your concerns here?

-- 
Tom