On Tue, 29 Jun 2021 at 17:00, Tom Rini <tr...@konsulko.com> wrote: > On Tue, Jun 29, 2021 at 02:23:15PM +0200, Heinrich Schuchardt wrote: > > On 6/29/21 12:48 PM, François Ozog wrote: > > > Hi > > > > > > Following a discussion with Civil Infrastructure Project TSC, there is > > > a watchdog protection issue with EFI: the time between the call to > > > ExitBootService and Linux kernel takes over watchdog service is not > > > covered by any watchdog protection. > > > > The UEFI specification requires a watchdog. So this must be an > > implementation specific problem. Which firmware-hardware combination are > > you referring to? > > > > U-Boot provides hardware watchdogs. > > Without side-tracking things too much, I do want to note the last time > within U-Boot we talked about watchdogs and UEFI specification, I > believe there was still some doubt how hardware watchdogs are handled vs > the notion of a software watchdog, and it should probably be clarified > which things we're talking about here. > My reading is that implementation may choose between "soft" are hardware watchdog. But the watchdog is active only up until ExitBootService: "Resets and sets a watchdog timer used during boot services time.". So I can understand some implementations that use hardware watchdog enhance the behavior and keeps active after ExitBootService is called: but that is a platform specific behavior. I'd like a specification and implementations for it.
> > -- > Tom > -- François-Frédéric Ozog | *Director Business Development* T: +33.67221.6485 francois.o...@linaro.org | Skype: ffozog _______________________________________________ boot-architecture mailing list boot-architecture@lists.linaro.org https://lists.linaro.org/mailman/listinfo/boot-architecture
