WinXP SP2 32-bit not work on iGPU

[Gelip]

Asus B85M-E, Intel Haswell CPU 4Gen with integrated iGPU graphics card, second graphics card PCIe AMD6450, SATA IDE mode, CSM Disabled, CSMWrap 1.2.1
Disk prepared using diskpart in WinPE 3.1 (Win7)
100MB FAT32 with EFI\Boot\bootx64.efi UEFI Shell and 121.efi (CSMWrap)
10GB NTFS for OS

I'm trying to install original WinXP Pro SP2 32-bit. Installation and OS after install works well with AMD6450 PCIe graphics card using its VBIOS - in CMOS Primary Display: PCIe

Unfortunately, with the Intel Haswell iGPU graphics card it does not work - in CMOS Primary Display iGPU. CSMWrap start, SeaBIOS runs OK - I see a distorted little XP logo for a moment at the top of the screen but hangs on black screen:

If I use the patched Longhorn 5472 loader (bootmgr, winload.exe, BCD in Boot folder) then the system boots up OK on iGPU - I see that SeaVGABIOS is being used - desktop is 800x600 but on monitor is a different resolution and you can see the aurora logo underneath:

but with Longhorn loader stuck on aurora boot screen on AMD6450 but OS work:

[FlyGoat]

This is actually modesetting issue I mentioned in #3.

[Gelip]

But why CSMWrap not use legacy VBIOS from iGPU?

PCIe AMD6450 - legacy AMD VBIOS is used
iGPU - SeaVGABIOS from CSMWrap is used

[FlyGoat]

But why CSMWrap not use legacy VBIOS from iGPU?

PCIe AMD6450 - legacy AMD VBIOS is used iGPU - SeaVGABIOS from CSMWrap is used

In this case I think UEFI doesn't expose legacy VBIOS as OpROM image. don't know if there is any alternative way to obtain VBIOS from UEFI.

[dietmarpapagei1]

May be,
that this is the problem with all graphiks in csmwrap.

@FlyGoat
Is there a possibility, that SeaBios looks always for an legacy VGA Option Rom on a graphik card
Dietmar

[Gelip]

In this case I think UEFI doesn't expose legacy VBIOS as OpROM image.

But motherboard has CSM in BIOS and if Enabled legacy OS'es normal works (without CSMWrap):

XP see normal OpROM VBIOS from iGPU:

[FlyGoat]

I have no idea about how to obtain VBIOS blob in UEFI... Maybe it's exposed by some protocol instead of PciIo...

[FlyGoat]

May be, that this is the problem with all graphiks in csmwrap.

@FlyGoat Is there a possibility, that SeaBios looks always for an legacy VGA Option Rom on a graphik card Dietmar

This is already the current logic. It will try to obtain Legacy VGA ROM and use it if possible, then fallback to SeaBIOSVGA.

However sometimes we don't know how to obtain it, especially for iGPU, if it's not exposed via ROM BAR.

[ghostplant]

@FlyGoat Does it boot XP if the machine is too new to have XP video driver?

[FlyGoat]

@ghostplant It really depends. We have a couple of fallback options, but none of them are working all the time.

[ghostplant]

OK, so standard universal GOP for XP/2003 still remains a problem..

[ghostplant]

@FlyGoat And does WinXP 32bit work if my machine is UEFI-x64 only?

[FlyGoat]

@ghostplant Yes in most cases. I can't give a universal answer because there are simply too much platform specific issues spanning from hardware to ACPI.

[ghostplant]

That's amazing

[Gelip]

@FlyGoat
I tested xp32 again with ntldr on iGPU. OS hangs after about 3 min, then in WinDBG error 0x4000008a probably caused by : ntkrpamp.exe and after about 10 min OS restart.
I found that VGA Enable on bridge to which the graphics card is connected helps boot with black screen but OS work:
https://msfn.org/board/topic/186793-csmwrap-boot-csm-on-uefi-only-systems/page/10/#findComment-1280453
https://msfn.org/board/topic/186793-csmwrap-boot-csm-on-uefi-only-systems/page/10/#findComment-1280449

My bridge is 00 01 00 so for VGA Enable I need this in UEFI Shell:
mm 0001003e 8 -pci

[FlyGoat]

@Gelip I actually have another project to deal with this issue. Just run this in efi shell before CSMWrap.

https://github.com/FlyGoat/vgaarb-efi