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Re: [PATCH 00/15] ppc/ppc405: decade cleanup


From: Cédric Le Goater
Subject: Re: [PATCH 00/15] ppc/ppc405: decade cleanup
Date: Sat, 18 Dec 2021 10:33:38 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0

Don't know if this is the reason of our problems but I think there is
something to investigate around timer interrupts:


/ # cat /proc/interrupts
             CPU0
   16:         68       UIC   1 Level     serial
LOC:          0   Local timer interrupts for timer event device
LOC:          0   Local timer interrupts for others
SPU:          0   Spurious interrupts
PMI:          0   Performance monitoring interrupts
MCE:          0   Machine check exceptions

Any idea what the problem can be ? How does QEMU generates timer
interrupts ?

The ppc405 timers were trashed by ddd1055b07fd ("PPC: booke timers").
I guess at the time, in 2011, there were no possible ways to test
regressions :/

This is addictive. I will look into it, I hope it's only a question
of adding back the TSR and TCR store helpers.

Thanks,

C.





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