[coreboot] Lenovo T60 - Intel graphics with unsupported display panel - black screen

[Łukasz Dmitrowski]

Problem solved after using VGABIOS extracted from factory BIOS instead of one extracted from memory.

Regards,
Lukasz Dmitrowski

On 14.08.2015 13:29, Łukasz Dmitrowski wrote:
> Hello,
>
> I am trying to run coreboot with seabios payload on Lenovo T60:
>
> Graphic: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
> Display panel: LTN141XA-L01
>
> So, graphic is Intel, but display panel LTN141XA-L01 is not supported for native
> graphics initialization. I dumped VGABIOS from memory and attached it to the ROM file:
>
> ./cbfstool coreboot.rom add -f vgabios_from_mem.bin -n pci8086,27a2.rom -t raw
> ./cbfstool coreboot.rom add-int -i 0 -n etc/optionroms-checksum
>
> Unfortunately after powering on - screen is black. Did I miss something?
>
> --------------------------------
>
> VGABIOS which I use:
>
> Image 1:
> PCI Expansion ROM Header:
>    Signature: 0x55aa (Ok)
>    CPU unique data: 0x75 0xe9 0xa9 0xe3 0x30 0x30 0x30 0x30
>                     0x30 0x30 0x30 0x30 0x30 0x30 0x30 0x30
>    Pointer to PCI Data Structure: 0x0040
>
> PCI Data Structure:
>    Signature: 0x50434952 'PCIR' (Ok)
>    Vendor ID: 0x8086
>    Device ID: 0x27a2
>    Vital Product Data:  0x0000
>    PCI Data Structure Length: 0x0018 (24 bytes)
>    PCI Data Structure Revision: 0x00
>    Class Code: 0x030000 (VGA Display controller)
>    Image Length: 0x0080 blocks (65536 bytes)
>    Revision Level of Code/Data: 0x0000
>    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: 0x75 (59904 bytes)
>    Entry point for INIT function: 0xe3af
>
> -----------------------------------
>
> ROM contents:
>
> cmos.default                   0x0        cmos_default 256
> cmos_layout.bin                0x140      cmos_layout  1824
> fallback/dsdt.aml              0x8c0      raw          12037
> fallback/romstage              0x3800     stage        36472
> fallback/ramstage              0xc6c0     stage        53914
> fallback/payload               0x199c0    payload      55825
> etc/ps2-keyboard-spinup        0x27440    raw          8
> config                         0x27480    raw          82
> revision                       0x27500    raw          569
> etc/optionroms-checksum        0x27780    raw          8
> pci8086,27a2.rom               0x277c0    raw          32768
> (empty)                        0x2f800    null         1901528
>
> ------------------------------------
>
> Regards,
> Lukasz Dmitrowski
>
>
>