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    SubjectRe: [PATCH] x86-64: disable the GART before allocate aperture
    On 6/22/07, Eric W. Biederman <> wrote:
    > Alan Cox <> writes:
    > For a normal kexec we should shut everything down before the kernel
    > transition so it should not be an issue.
    > YH do you think you can look at simply reserving a portion of the iommu?
    > And having the kexec on panic kernel use the reserved portion?
    two copy region: one for first kernel, and one for second kernel? it
    should work.
    first kernel is using [64M, 128M), and the second will get assign to
    [64M,128M) again.
    when it try to memset to clear that region it will cause restart.
    in that region, only first 256K can not touched, even read. rest could
    be accessed.

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