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    SubjectRe: Geode LX boot fails after x86 microcode revision change
    On Tue, Nov 08, 2011 at 01:59:40PM -0600, Daniel Drake wrote:
    > Hi,
    > Linux-3.1 works fine on OLPC XO-1 (Geode LX) but latest linus master
    > fails to boot. It hangs so early on that we don't even receive any
    > output over serial.
    > git bisect tracked it down to:
    > commit bcb80e53877c2045d9e52f4a71372c3fe6501f6f
    > Author: Borislav Petkov <>
    > Date: Mon Oct 17 16:34:36 2011 +0200
    > x86, microcode, AMD: Add microcode revision to /proc/cpuinfo
    > Enable microcode revision output for AMD after 506ed6b53e00 ("x86,
    > intel: Output microcode revision in /proc/cpuinfo") did it for Intel.
    > Signed-off-by: Borislav Petkov <>
    > Any thoughts?


    it might be that the Geode doesn't have the patch level MSR.., can you
    send /proc/cpuinfo from a working kernel please, say 3.1?

    Although, I have rdmsr_safe in the patch there so it actually shouldn't
    be an issue, theoretically.

    Can you also install msr-tools and do

    $ rdmsr 0x8b

    as root on the working kernel? If it hangs there too, then we know why.

    Also, can you boot if you comment out the rdmsr_safe line in
    early_init_amd(), line 477:

    // rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);




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