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    SubjectRe: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64
    Christian Volkmann wrote:
    > 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.

    I applied the patch on rc2, changed 'if CONFIG_MVIAC3_2' in if
    CONFIG_MVIAC7' and build a working VIA C7 kernel.

    --
    Hans
    -
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