Re: Trying to access the Expansion ROM of a video card

[Riza Dindir <riza.dindir%gmail.com@localhost>]

Hello All,

As you know I have a laptop that has amd radeon r7 m265 graphics
device (it seems there are two actually; 0x1002/0x1309 and
0x1002/0x6604). My kernel panics when I do enable radeon, not finding
any ROM.

I am using netbsd 9.2 amd64 and am using UEFI boot.

After reading kern/49964 (which had the same panic with my system -
radeon_get_bios does not find a bios) I did some testing. Here is what
I have so far.

The memory at 0xC0000 (size 131072) starts with 0xff 0xff. So this
means that there is no valid expansion ROM here. This is what I have
done to get this dump (dd if=/dev/mem of=/tmp/bios bs=1 iseek=786432
count=131072) and to view it I used (hexdump -C /tmp/bios). If there
is anything that looks wrong let me know.

Then I have dumped the data on the two PCI devices mentioned above. To
arrive at these I did use (pcictl pci0 dump -d 1 -f 0 and pcictl pci1
dump -d 0 -f 0). Here is the outcome.

The device on pci0:1:0 is as such

PCI configuration registers:
  Common header:
    0x00: 0x13091002 0x00100007 0x03000000 0x00800010

    Vendor Name: ATI Technologies (0x1002)
    Device ID: 0x1309
    Command register: 0x0007
.....
 Type 0 ("normal" device) header:
    0x10: 0xe000000c 0x00000000 0xf000000c 0x00000000
    0x20: 0x00004001 0xf0b00000 0x00000000 0x08641025
    0x30: 0xfffe0001 0x00000048 0x00000000 0x00000100

    Base address register at 0x10
      type: 64-bit prefetchable memory
      base: 0x00000000e0000000
    Base address register at 0x18
      type: 64-bit prefetchable memory
      base: 0x00000000f0000000
    Base address register at 0x20
      type: I/O
      base: 0x00004000
    Base address register at 0x24
      type: 32-bit nonprefetchable memory
      base: 0xf0b00000
    Cardbus CIS Pointer: 0x00000000
    Subsystem vendor ID: 0x1025
    Subsystem ID: 0x0864
    Expansion ROM Base Address Register: 0xfffe0001
      base: 0xfffe0000
      Expansion ROM Enable: on
      Validation Status: Validation not supported
      Validation Details: 0x0
    Capability list pointer: 0x48
    Reserved @ 0x38: 0x00000000
    Maximum Latency: 0x00
    Minimum Grant: 0x00
    Interrupt pin: 0x01 (pin A)
    Interrupt line: 0x00

and for the device on pci1:0:0 has this information

PCI configuration registers:
  Common header:
    0x00: 0x66041002 0x00100007 0x03800000 0x00000010

    Vendor Name: ATI Technologies (0x1002)
    Device ID: 0x6604
    Command register: 0x0007
.......
Type 0 ("normal" device) header:
    0x10: 0xd000000c 0x00000000 0xf0a00004 0x00000000
    0x20: 0x00003001 0x00000000 0x00000000 0x086a1025
    0x30: 0xfffe0000 0x00000048 0x00000000 0x00000100

    Base address register at 0x10
      type: 64-bit prefetchable memory
      base: 0x00000000d0000000
    Base address register at 0x18
      type: 64-bit nonprefetchable memory
      base: 0x00000000f0a00000
    Base address register at 0x20
      type: I/O
      base: 0x00003000
    Base address register at 0x24
      not implemented
    Cardbus CIS Pointer: 0x00000000
    Subsystem vendor ID: 0x1025
    Subsystem ID: 0x086a
    Expansion ROM Base Address Register: 0xfffe0000
      base: 0xfffe0000
      Expansion ROM Enable: off
      Validation Status: Validation not supported
      Validation Details: 0x0
    Capability list pointer: 0x48
    Reserved @ 0x38: 0x00000000
    Maximum Latency: 0x00
    Minimum Grant: 0x00
    Interrupt pin: 0x01 (pin A)
    Interrupt line: 0x00

The ROM in the pci0:1:0 has the PCI ROM enabled but the ROM address is
not correct i think. Would you have any ideas on where the expansion
ROM might be found? Whereelse might I look? Since I am using UEFI, can
this ROM be located in the UEFI boot directories somewhere? Any
pointers, any information or any ideas would be appreciated.

Thanks in advance.

Best Regards,
Riza Dindir