[coreboot] [PATCH] AMD MMCONF Support

[Arne Georg Gleditsch]

Ed Swierk  writes:
> It appears that the write to register 0x78 is attempting to switch the
> LPC device from subtractive decode to positive decode. Presumably the
> hang is due to the LPC device not being configured for some IO or
> memory range. Why you're seeing the hang only when mmconfig is
> enabled, I have no idea.
>
> I'd vote for removing that line, but I have no means to check whether
> that would break any board.

Thanks for checking, Ed.  The following patch implements/fixes PCI
MMCONF support for AMD Fam10 systems, and includes commenting out of the
offending line in the MCP55 setup code.  It also converts a couple of
pci_*_config accesses in amdfam10/early_ht.c to pci_io_*_config, as they
run before MMCONF is ready.  (There's a comment regarding this in the
top of that file, but that was apparently not sufficient to prevent
these calls from sneaking in.)

Signed-off-by: Arne Georg Gleditsch