[coreboot] T60 with ATI has black screen

[Richard Simpson]

Hello,

I have finally successfully flashed the BIOS on my T60 with coreboot.
Sadly, my ATI controlled screen remains completely black.  Fortunately I
can still get in via ssh.  Here is what I can deduce so far.

lspci says:
01:00.0 0300: 1002:7145 (prog-if 00 [VGA controller])
        Subsystem: 1002:0000
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at e0000000 (32-bit, prefetchable) [size=128M]
        Region 1: I/O ports at 4000 [size=256]
        Region 2: Memory at ec120000 (32-bit, non-prefetchable) [size=64K]
        Expansion ROM at ec100000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon

The vgabios which I extracted from the factory bios reports as follows:

Image 1:
PCI Expansion ROM Header:
  Signature: 0x55aa (Ok)
  CPU unique data: 0x7e 0xe9 0x6f 0x02 0x00 0x00 0x00 0x00
                   0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
  Pointer to PCI Data Structure: 0x0230

PCI Data Structure:
  Signature: 0x50434952 'PCIR' (Ok)
  Vendor ID: 0x1002
  Device ID: 0x7145
  Vital Product Data:  0x0000
  PCI Data Structure Length: 0x0018 (24 bytes)
  PCI Data Structure Revision: 0x00
  Class Code: 0x030000 (VGA Display controller)
  Image Length: 0x007e blocks (64512 bytes)
  Revision Level of Code/Data: 0x090c
  Code Type: 0x00 (Intel x86)
  Last-Image Flag: 0x80 (last image in rom)
  Reserved: 0x0000

Platform specific data for x86 compliant option rom:
  Initialization Size: 0x7e (64512 bytes)
  Entry point for INIT function: 0x275

This looks like the right VGA BIOS to me.

Once I have added it to the coreboot image I can check the contents as
follows:

coreboot.rom: 2048 kB, bootblocksize 952, romsize 2097152, offset 0x0
alignment: 64 bytes, architecture: x86

Name                           Offset     Type         Size
cmos.default                   0x0        cmos_default 256
cmos_layout.bin                0x140      cmos_layout  1824
fallback/dsdt.aml              0x8c0      raw          12037
cpu_microcode_blob.bin         0x3800     microcode    94208
etc/ps2-keyboard-spinup        0x1a880    raw          8
config                         0x1a8c0    raw          4046
revision                       0x1b8c0    raw          571
(empty)                        0x1bb40    null         17432
fallback/romstage              0x1ff80    stage        36524
fallback/ramstage              0x28ec0    stage        53635
fallback/payload               0x36080    payload      55837
pci1002,7145.rom               0x43b00    raw          64512
(empty)                        0x53740    null         1754264

I would be most grateful for any suggestions as to where I might be
going wring or further diagnostics.

Thanks,

	Richard Simpson