Christian wrote:
Hmm, I really think so...:
May I brought up a wrong reason with the command cmpxchg64.
But disabling CONFIG_X86_CMPXCHG64 helps.
Hi,
I found some time to investigate. My resume is:
- kernel/verify_cpu.S causes the stop at boot time
Cause the required flag for CMPXCHG8B is not set.
- boot/setup.S did not print "PANIC: CPU too old for this kernel"
( not visible, also the message did not match )
- VIA C3_2: CMPXCHG8B should work always. Via C3 EBGA Datasheet R1.90 page 30 (3-4)
But the bit is not set cause of some early Win NT bugs.
- X86_CMPXCHG64 can be set and used. Just verify_cpu.S requires a change
to ignore the missing indicator at boot time.
My suggestion for the fix is:
- kernel/verify_cpu.S should be more tolerant if CONFIG_MVIAC3_2 is set
( see patch below )
- boot/setup.S should be fixed to print out a proper error message
( see below )
- X86_CMPXCHG64 patch(earlier mail in thread ) should not be used.
- Important: somebody to check other CPU types if the same behavior happens.