On 12.07.21 16:19, Cedric Hombourger wrote: > > On 7/12/2021 3:57 PM, Jan Kiszka wrote: >> On 12.07.21 15:37, Cedric Hombourger wrote: >>> SIMATIC IPCs 227E/277E share the same external watchdog (SCH5347) >>> than the IPC 4x7Es we already support. Initialization of the >>> SAFE_EN_N line differs a bit and was therefore moved to separate >>> setup functions. Programming and enabling of the timeout is the >>> same and is now handled in set_timeout(). With this change, both >>> Linux and efibootguard would use the same chip and no longer >>> depend on the built-in iTCO watchdog. >> The 4x7E had a hard requirement to use platform watchdog rather than >> iTCO - because the latter was unable to actually reset the device. This >> limitation does not exist on the 2x7E series. Your commit message is >> lacking a reasoning why a user should use that special watchdog, rather >> than the working and widely supported iTCO? > > Well I do not have a reason other than the Simatic IPC team "insisting" > on us using the external one via their simatic-ipc-wdt driver. We have > indeed found both watchdogs to be working just fine. However having > efibootguard initializing the built-in watchdog (iTCO) and Linux > blacklisting iTCO and using simatic-ipc-wdt (as instructed) is simply > asking for troubles (IMO).
That is true - but also not the problem of EBG but rather of the Linux configuration (no need to prioritize the platform watchdog there as well). > > If you believe we can push back and use the iTCO across the board, I am > all for it and both of us could talk to Florian S and maybe have his > team update the simatic-ipc-lsp documentation to make it clear that the > iTCO driver may safely be used on 227E (as we both found) > > Let me know if you have other ideas or suggestions Already ping'ed Henning on this internally, now here as well, as he is managing the IPC driver upstreaming. We have to tell the Linux community the same story like here. If there is a technical reason to favor platform over standard, we share that in EBG, obviously. Jan -- Siemens AG, T RDA IOT Corporate Competence Center Embedded Linux -- You received this message because you are subscribed to the Google Groups "EFI Boot Guard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/efibootguard-dev/443446fd-d9f9-7fad-cbcd-298d7da7efd9%40siemens.com.
