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SubjectRe: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported regressions from 2.6.24)
On Sat, 22 Mar 2008, Linus Torvalds wrote:
> On Sat, 22 Mar 2008, Stefan Richter wrote:
> >
> > Can an MMIO region reside above 0x1'0000'0000 on x86-32? ... Apparently yes,
> > if CONFIG_RESOURCES_64BIT=y.
>
> Hmm. It would only work if PAE (HIGHMEM64G) is enabled too.
>
> And obviously the hardware has to have working 64-bit BAR's.
>
> AND no, I don't think our x86-32 ioremap() actually works for this case,
> because while the resource data may have the full 64 bits, when the
> ioremap() happens it gets truncated to 32 bits.
>
> Ingo/Thomas - should ioremap*() perhaps take "resource_size_t" or a "u64"
> for the address (and then "__ioremap()" should probably take a PFN, not a
> physical address, and that one can remain just a "unsigned long"?)

Hmm. No idea. I look into that on monday (tomorrow is family
day). Right now I'm too tired to provide any useful input.

> Has anybody ever had a working 64-bit BAR on x86? Ivan? Maybe I'm missing
> something..

Same here.

Thanks,

tglx


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