forked from luck/tmp_suning_uos_patched
c1f343028d
There's a problem on some embedded platforms when we re-assign everything on PCI, such as 44x. The generic code tries to avoid assigning devices to addresses overlapping the low legacy addresses such as VGA hard decoded areas using constants that are unfortunately no good for us, as they don't take into account the address translation we do to access PCI busses. Thus we end up allocating things like IO BARs to 0, which is technically legal, but will shadow hard decoded ports for use by things like VGA cards. This works around it by attempting to reserve legacy regions before we try to assign addresses. NOTE: This may have nasty side effects in cases I haven't tested yet: - We try to use FW mappings (ie. powermac) and the FW has allocated a conflicting address over those legacy regions. This will typically happen. I would expect the new code to just fail with an informative message without harm but I haven't had a chance to test that scenario yet. - A device with fixed BARs overlapping those legacy addresses such as an IDE controller in legacy mode is in the system. I don't know for sure yet what will happen there, I have to test :-) Ideally, we should change PCIBIOS_MIN_IO/MIN_MEM accross the board to take a bus pointer so they can provide appropriate per-bus translated values to the generic code but that's a more invasive patch. I will do that in the future, but in the meantime, this fixes the problem locally Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> |
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