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    SubjectRe: Math-emu kills the kernel on Athlon64 X2


    On Tue, 19 Sep 2006, Jesper Juhl wrote:
    >
    > Booting with: vga=normal no387 nofxsr
    > gets me no forther. These are all the messages I get:
    >
    > boot: 2.6.18rc7git2 vga=normal no387 nofxsr
    > Loading 2.6.18rc7git2...................................
    > BIOS data check successful
    > Uncompressing Linux... Ok, booting the kernel.
    >
    > And then the system hangs and requires a power cycle.
    >
    > So unfortunately that does't help much :-(

    Ok. The next phase is to try to figure out where it hangs, and since it
    happens very early, that's most often most easily done the hard way: add
    some code that reboots the machine, and if the machine hangs, you didn't
    reach it.

    These days there's a slightly easier approach: if you enable PM_TRACE
    support (you need to enable PM and PM_DEBUG and EXPERIMENTAL to get it),
    you can do

    #include <resume-trace.h>

    at the top of a file, and add a sprinkling of "TRACE_RESUME(x)" calls
    (where "x" is some integer in the range 0-15 that you can use to save off
    the iteration count in a loop, for example - leave at 0 if you're not
    interested).

    And then, when it hangs, once you reboot into the same kernel (without the
    "no387", so that it works ;), it should tell you where the last
    trace-point was fairly early in the bootup dmesg's.

    (It _will_ screw up your time-of-day clock in the process, though, which
    is why tracing is so hard to enable on purpose ;)

    Linus
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