Messages in this thread | | | Date | Wed, 26 Mar 2008 14:12:04 +0300 | From | Ivan Kokshaysky <> | Subject | Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported regressions from 2.6.24) |
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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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