Jeff and others maintaining the ahci.c driver file:
I have a current XFX GeForce 8200 motherboard with an
on-board SATA controller based around the NVidia GeForce
8200 or MCP78S chipset. If I attempt to boot either a
opensuse-11.1 2.6.27.7-9-default kernel or a kernel.org
2.6.28 kernel without passing a "pci=nomsi" the
SATA hard drive hung off of the on-board controller chip is
not detected. I have the motherboard BIOS set to use a SATA
mode of AHCI. If I pass the pci=nomsi to either kernel then
the sata hard disks are found just fine.
I see in looking at the code in the ahci.c file in
drivers/ata that you do detection of some board IDs and for
some boards you set AHCI_HFLAG_NO_MSI. If the code in the
ahci.c file would recognize the motherboards with the MCP78S
chipset then it might be a good idea to set the
AHCI_HFLAG_NO_MSI flag for those boards as well.
If you can tell me how to find that board id that is used
to ident boards in ahci.c I can get that information to you
if that would help others who have the same problem. I think
it must be better to turn off MSI for specific chips or
on an individual PCI bridge rather than do it globally for
the whole system with pci=nomsi
--
Steven DuChene
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