CSMwrap - boot CSM on UEFI only systems.

[Dietmar]

@UsefulAGKHelper

The PAE works in XP SP3.

The problem is with the second PCI-Bus 1, first introduced by Intel for the Arrow Lake.

Before, there exist only one PCI-Bus.

Now XP SP3 cant split its resources for both busses.

A modd in DSDT does not help, to put all to a single PCI-bus.

And on PCI-Bus 1 hangs slot 1 with graphic card

Dietmar

[Dietmar]

Can efirom been started from the UEFI shell?

Please link for download efirom

Dietmar

[reboot12]

No, efirom.exe is Windows CMD executable:
https://www.mediafire.com/file/luqx9gx86u9monv/EfiRom.zip/file

After you build rom then posiible load it in UEFI Shell using command loadpcirom

Edited 19 hours ago by reboot12

[Dietmar]

@reboot12

Thanks for link to efirom.exe

I just download.

There really seems to be no tool at all, that can work from the UEFI shell,

emulating INT10h and load the Legacy VGA Option Rom vga.bin to memory at C0000.

And after this work, return to the UEFI shell.

I think, csmwrap.efi tries to do exact this and it would be interesting to watch its doing while work.

You can see the Ven_&Dev_ number of your graphic card just before the start of SeaBios,

but this seems not to be enough, what csmwrap.efi is doing until this time and because ot this,

you get black screen or SeaBios is never loaded

Dietmar

Edited 19 hours ago by Dietmar

[reboot12]

@Dietmar

I think that rom builded using efirom can work and CSMWrap will be able to use the legacy part from the loaded rom file. In uefi bios legacy VBIOS iGPU is in RAW area in CSMCORE module and CSMWrap not know where. But if you use loadpcirom legacy+uefi.rom your graphics card then maybe CSMwrap see legacy part using PCI I/O protocol same as use legacy rom from PCIe graphics card.

Edited 18 hours ago by reboot12