Hi Lukasz,
maybe there is a way to run coreboot (coreboot-libre) without the VGABIOS blob on your T60.
You may check if you are running coreboot with dual channel LVDS mode enforced (register "gfx.lvds_dual_channel" = "1").
If this is true, changing to single channel LVDS mode (register "gfx.lvds_dual_channel" = "0") may result in native graphics initialization.
This would be the inversely workaround for a T400 with a "high-resolution" display [1 [1]].
Best Regards,
Kroms
[1] http://libreboot.org/docs/hcl/gm45_lcd.html
Am 14.08.2015 15:08 schrieb 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
Links: ------ [1] http://libreboot.org/docs/hcl/gm45_lcd.html