[coreboot] Geode GX2 VGA problems

[Nils]

Hello all,
In the past i used coreboot without a VGAbios and used the linux framebuffer 
driver and that works ok.
I am trying to get onboard early VGA running on my Geode GX2 board but until 
now i have no succes.( the screen stays black until the framebuffer driver in 
linux loads)
I have SoftVG in my VSA2 blob.
I am running the (extracted) original VGA bios via Seabios.

This is from lspci with the original bios:
00:01.1 0300: 100b:0030 (prog-if 00 [VGA controller])
	Subsystem: 100b:0030
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
	Region 0: Memory at 41000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at 40ffc000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at 40ff8000 (32-bit, non-prefetchable) [size=16K]
	Region 3: Memory at 40ff4000 (32-bit, non-prefetchable) [size=16K]

This is from lspci with coreboot/seabios:
00:01.1 0300: 100b:0030 (prog-if 00 [VGA controller])
	Subsystem: 100b:0030
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
	Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at fe000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at fe004000 (32-bit, non-prefetchable) [size=16K]
	Region 3: Memory at fe008000 (32-bit, non-prefetchable) [size=16K]
	Expansion ROM at <unassigned> [disabled]
	Kernel driver in use: gxfb

If i force the driver on via the virtual VSA2 register in gprhinit.c the 
softvg seems to setup a video text buffer from A0000-BFFFF .

Could the problem have anything to do with the fact that the VSA2 code runs in 
a different memory region? (setup by oprom)
And therefore the video bars GP, VP and DC are also in a different address 
range so VSA2 or VGAbios can not find them?

I don't know how this exactly works and maybe i am doing something stupid but 
maybe someone could give me any advise on how to debug this further. 

Thanks, Nils.