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    SubjectRe: Math-emu kills the kernel on Athlon64 X2


    On Tue, 19 Sep 2006, Jesper Juhl wrote:
    >
    > If I enable the math emulator in 2.6.18-rc7-git2 (only version I've
    > tried this with) and then boot the kernel with "no387" then I only get
    > as far as lilo's "...Booting the kernel." message and then the system
    > hangs.

    I'm wondering if it tries to use the MMX/XMM stuff for memcpy and friends.

    I'm also wondering why you'd be doing what you seem to try to be doing in
    the first place ;)

    Basically, "no387" doesn't seem to disable any of the fancier FPU
    features, even though it obviously should. If you ask for math emulation,
    you'll get emulation faults for _all_ of the modern MMX stuff too (which
    we don't do).

    It's entirely possible that nobody has ever tested this combination.

    Linus
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