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    SubjectRe: [PATCH 2/4] x86: ioremap: fix physical address check
    On Fri, 11 Jun 2010 10:43:27 -0700
    "H. Peter Anvin" <hpa@zytor.com> wrote:

    > On 06/11/2010 02:20 AM, Kenji Kaneshige wrote:
    > > If the physical address is too high to be handled by ioremap() in
    > > x86_32 PAE (e.g. more than 36-bit physical address), ioremap() must
    > > return error (NULL). However, current x86 ioremap try to map this too
    > > high physical address, and it causes unexpected behavior.
    >
    > What unexpected behavior? It is perfectly legitimately to map such a
    > high address in PAE mode. We have a 36-bit kernel-imposed limit on
    > *RAM* in 32-bit mode (because we can't manage more than that), but there
    > is no reason it should apply to I/O.
    >

    I'm sorry for lack of study.
    How to access it via mapped area by ioremap() ?

    Thanks,
    -Kame



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