[coreboot] VGA doesn't work on Mohon Peak

[Kuzmichev Viktor]

Hello,

I'm using coreboot + SeaBIOS on Mohon Peak CRB. And I've tried to make 
VGA work for a while now. I used this article as a guide:
http://www.coreboot.org/VGA_support

Extracting VGA BIOS from vendor BIOS image did not work:
$ ./bios_extract EDVLCRB1.86B.0043.R00.1408290947_MPK.bin
Using file "EDVLCRB1.86B.0043.R00.1408290947_MPK.bin" (8192kB)
Error: Unable to detect BIOS Image type.

Then, I've downloaded VGA BIOS from here:
http://www.aspeedtech.com/support.php
Mohon Peak uses Aspeed VGA controller AST1300.

And also, I've extracted Video ROM from /dev/mem:
# dd if=/dev/mem of=vgabios.bin bs=1k count=32 skip=768

Neither of them worked. Here's what I've tried. I've tried to add them 
via coreboot's menuconfig (' Add VGA BIOS image' option). I've tried to 
add them manually via cbfstool as an optionrom and as a raw file. I've 
tried to put them in CBFS under vgaroms/ directory. Here's my latest 
ROM-file layout:
$ ./build/cbfstool build/coreboot.rom print
coreboot.rom: 8192 kB, bootblocksize 1024, romsize 8388608, offset 0x600000
alignment: 64 bytes, architecture: x86

Name                           Offset     Type         Size
cmos_layout.bin                0x600000   cmos_layout  1352
pci1a03,2000.rom               0x600580   optionrom    32768
fallback/romstage              0x6085c0   stage        26616
fallback/ramstage              0x60ee00   stage        59904
fallback/payload               0x61d840   payload      56100
config                         0x62b3c0   raw          4532
revision                       0x62c5c0   raw          708
pci8086,1f41.rom               0x62c8c0   raw          61952
vgaroms/pci1a03,2000.rom       0x63bb00   raw          32768
img/Memtest86+(5.01)           0x643b40   payload      159492
(empty)                        0x66aa80   null         939288
mrc.cache                      0x74ffc0   (unknown)    65536
cpu_microcode_blob.bin         0x760000   microcode    83968
(empty)                        0x774840   null         46936
fsp.bin                        0x77ffc0   (unknown)    372736
(empty)                        0x7db000   null         150424

The entries pci1a03,2000.rom are the VGA ROMs there. I also tried to 
remove either of them. I've tested with coreboot option 'Run VGA Option 
ROMs' checked and unchecked without any difference. In SeaBIOS I set 
'VGA Hardware Type (coreboot linear framebuffer)' as the other options 
are None, GeodeGX2 and GeodeLX, so coreboot linear framebuffer seemed 
more logical.

I saw this mailing list:
http://www.seabios.org/pipermail/seabios/2015-January/008588.html
but found no solution there and it seems not to be my case as my board 
does not hang.

I put coreboot and SeaBIOS output in the attachment. Debug levels set to 
7 for both. In coreboot only 'Output verbose CBFS debug messages' 
checked in 'Debugging' submenu.

Is there anything I'm doing wrong or simply missing?

Viktor
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