[SeaBIOS] [PATCH] piix: fix mtrr setup

[Kevin O'Connor]

On Mon, Oct 22, 2012 at 10:12:03AM +0200, Gerd Hoffmann wrote:
> Add a piix4 memory setup function to make the control flow more clear.
> 
> Set the new mtrr_base variable (added by q35 patch set) to the start of
> the 32bit pci window to make sure the mtrr entry added covers the I/O
> window.
> 
> Make the 32bit pci window start at 0x80000000, 0xc0000000 or 0xe000000
> (depending on the memory installed) so we can cover the whole window
> with a single mtrr entry.

Patch looks okay to me.  However, as noted in the q35 patch series,
I'd prefer to see the scan moved out of pci_bios_map_devices() and the
global pcimem_start assigned directly instead of via a pointer.

-Kevin