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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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