On Fri, Sep 25, 2020 at 01:29:18PM +0200, Heinrich Schuchardt wrote: > On 25.09.20 10:36, Wolfgang Denk wrote: > > Dear Tom, > > > > In message <20200924131931.GF14816@bill-the-cat> you wrote: > >> > >> I'm talking about the case where we say we've enabled the WDT to > >> supervise OS, but then bootefi something and have disabled the watchdog > >> (to meet UEFI requirements) but didn't tell the user we've turned off > >> the WDT that we had told them is on. > > > > Any so-called "watchdog" that can be disabled / switched off by > > software is not really woth this name. As such, the concept of > > disabling a watchdog in software, is misleading at best and should > > never ibe implemented. > > If we want to boot UEFI payloads, we will have to follow the UEFI > specification even if we think it is not perfect.
I really really want to know what the UEFI specification says about hardware watchdogs. Especially given the push to use a subset of UEFI for embedded. Most modern SoCs include a watchdog IP block and it can be used for a traditional watchdog and it's also used for reset. Or simply must be serviced periodically. -- Tom
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