Fix support for earlier i8XX chipsets (specifically the 830 and 840).

Earlier changes meant that we were reading the wrong register, on the
graphics card instead of the gmch (bus 0, device 0, function 0. it's the
memory controller on all boards with intel chipsets).  Later chipsets
have a ``mirror'' register on the graphics card device, explaining why
this didn't manifest on all chipsets. For simplicity, always find and
read the register from the GMCH. While i'm here, fixup unaligned
configuration space access (0x50 vs 0x52)

Tested by several.

0 files changed, 0 insertions, 0 deletions