Updating Talos II firmware to IBM PNOR V2.18?

[JeremyRand]

According to this IBM documentation (thanks awilfox for the pointer), PNOR v2.18 contains the following change:

HIPER/Pervasive:   A problem was fixed for a processor core checkstop with SRC BC70E540 logged with Signature Description " ex(n0p1c4) (NCUFIR[11]) NCU no response to snooped TLBIE".  This problem is intermittent and random but occurs with relatively high frequency for certain workloads.  The trigger for the failure is one core of a fused core pair going into a stopped state while the other core of the pair continues running.

Is it possible to get the Talos II firmware bumped to upstream IBM v2.18? I believe I may be running into this bug.

[tle]

AFAIK no, Talos firmware is not synced with upstream however it does not stop people from using a modified version of upstream kernel. Perhaps you should have a read at https://www.flamingspork.com/blog/2020/05/25/op-build-v2-5-firmware-for-the-raptor-blackbird/ and see if you could adapt anything from his work

[tle]

Having said that, I am unsure if using custom firmware would void warranty or not. That I have to leave the answer to official response from RaptorCS

[ejfluhr]

I believe that all OpenPOWER/OPAL-based systems use SMT4 cores, not SMT8 (i.e. "fused") cores.    So that may mean you aren't seeing the same problem.

Do you get the same fault callout?