With 2.6.36-rc1 from the mainline git tree, my x86_64 system running on an AMD
Turion 64 x2 TL-60 has required pressing keys to get booting to advance. This
behavior begins as soon as the kernel is loaded. I bisected the problem to:

commit 9d8888c2a214aece2494a49e699a097c2ba9498b
Author: Hans Rosenfeld <hans.rosenfeld@amd.com>
Date:   Wed Jul 28 19:09:31 2010 +0200

    x86, cpu: Clean up AMD erratum 400 workaround

    Remove check_c1e_idle() and use the new AMD errata checking framework
    instead.

    Signed-off-by: Hans Rosenfeld <hans.rosenfeld@amd.com>
    LKML-Reference: <1280336972-865982-2-git-send-email-hans.rosenfeld@amd.com>
    Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Reverting this patch allows the current 2.6.36-rc1+ to boot normally.

This problem is entered into the Kernel Bugzilla as Bug #16636.

Larry
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