Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reportedregressions from 2.6.24)

[Ivan Kokshaysky]

On Tue, Mar 25, 2008 at 09:29:54PM +0100, Ingo Molnar wrote:
> OTOH, before this system worked for you before, i start to suspect that 
> ioremap is a red herring here and that it's the code that gets to that 
> physical address (which is ioremap-ed) is at fault here.
> 
> the hard hang might be your southbridge totally dumbfounded by the host 
> OS attempting to do an MMIO access to an above-4GB address?

The Intel 94x chipsets must be OK wrt >4Gb MMIO accesses, as far as I know.
You should just get all 1s on read of non-existent MMIO address, as usual.
Not a hard hang.

So I suspect something is still broken in 64-bit ioremap... It would be nice
to sort that out, even though it seems to be unrelated to this particular
problem.

Ivan.
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