SiS 645DX patch

["Jeroen" <koffieyahoo@xxxxxxxxxxx>]

This patch enables the dma for the SiS 963 south bridge that accompanies my
SiS 645DX. It may also enable the dma in case of a SiS 962, although I don't
have the right hardware test this. In case of the SiS 961 I'm pretty sure
Jeroen Ruigrok already did the appropriate patching.

The pci_read/pci_write command in the patch come from the FreeBSD 5 code.
The rest of the code is just a copy of what occurs in many places in
ata-dma.c and ata-pci.c

Note that this patch does not fix the hanging during boot that occurs once
in a while. I have no idea why this happens.

Jeroen Ketema


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