[coreboot] CBFS looking smbus for option rom?

[Joseph Smith]

Why would CBFS look for a option rom for the ICH4 SMBUS device? From 
boot log:

PCI: 00:1f.3 init
Check CBFS header at fffeffe0
magic is 4f524243
Found CBFS header at fffeffe0
Check fallback/coreboot_ram
CBFS: follow chain: fff80000 + 38 + 8049 + align -> fff880c0
Check pci8086,3577.rom
CBFS: follow chain: fff880c0 + 38 + 10000 + align -> fff98100
Check
CBFS: follow chain: fff98100 + 28 + 57eb8 + align -> ffff0000
CBFS:  Could not find file pci8086,24c3.rom
In cbfs, rom address for PCI: 00:1f.3 = 00000000
On mainboard, rom address for PCI: 00:1f.3 = 0