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    Subjectioremap_nocache problem?
    ioremap_nocache does the following:
    return __ioremap(offset, size, _PAGE_PCD);

    However, in drivers/char/mem.c (2.4.0), we see the following:

    /* On PPro and successors, PCD alone doesn't always mean
    uncached because of interactions with the MTRRs. PCD | PWT
    means definitely uncached. */
    if (boot_cpu_data.x86 > 3)
    prot |= _PAGE_PCD | _PAGE_PWT;

    Does this mean ioremap_nocache() may not do the job?

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