Jesse Barnes wrote:
On Wednesday, May 2, 2007 4:54 pm Jesse Barnes wrote:
What happens if you take out the chipset register detection, does
the MCFG table give you the same result? Wonder if they're doing
something funny with start/end bus values or something in their
table. There's some code in my patch that prints out the important
data from the MCFG table, can you tell me what that shows with the
chipset detection taken out?
Yeah, I'll look a little more closely. It could also be that another
register needs tweaking somewhere to actually get the bridge to
decode the space.
If that doesn't provide any useful information, I think we may need
some assistance from Intel chipset/motherboard people to figure out
what is going on here..
I'm talking with them now, hopefully they'll shed some light on it.
I did a little more debugging this morning, and found that I can
actually do reads from the space described by ACPI and the device
register, but later when ACPI actually scans the root bridges, it
hangs. Specifically the call to pci_acpi_scan_root in
pci_root.c:acpi_pci_root_add() never seems to return.
I'll walk through that logic when I get back to my test box, but it's
also worth noting that Vista's MCFG on this machine apparently works ok
too.
I would try sticking some debug in arch/x86_64/pci/mmconfig.c at the
beginning and end of pci_mmcfg_read and pci_mmcfg_write to print the
seg, bus, devfn and reg for each read and write. Hopefully that will
track down the one that is causing the lockup, if it is an actual
MMCONFIG access that's doing it..
--
Robert Hancock Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/
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