Also (in case it is useful for the corruption issue):

00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Device 9874 (rev ca)
...
03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 699f
(rev ff)

# echo 1 > /sys/bus/pci/devices/0000\:00\:01.0/rom
# cat /sys/bus/pci/devices/0000\:00\:01.0/rom > /tmp/vbios.rom
cat: /sys/bus/pci/devices/0000:00:01.0/rom: Input/output error

...

# echo 1 > /sys/bus/pci/devices/0000\:03\:00.0/rom
# cat /sys/bus/pci/devices/0000\:03\:00.0/rom > /tmp/vbios.rom
cat: /sys/bus/pci/devices/0000:03:00.0/rom: Input/output error