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CSM BIOS for EFI machines - success! (Announce)

posted by RayeR Homepage, CZ, 11.06.2025, 04:32

I just tested CSMWrap on windows10-only tablet Notebook TrekStor SurfTab twin 11.6 with Intel(R) Atom(TM) x5-Z8350 CPU @ 1.44GHz. It has AMI Aptio UEFI 32-bit without CSM.
I put CSMWrap on USB stick and boot it via boot menu (that can be enabled in setup) and it let me boot DOS. I can run commandline tools but most of those using TUI or GUI doesn't work (don't display any output, maybe due to direct VGA access). Even simple programs like Edit, Qbasic, MicroManager. A few that works are e.g. GRUB4DOS or Heaven7 demo...
I also tried to run SBEMU but it didn't recognize any sound HW.
There should be PCI HDA device:

PCI device #8 found at bus: 0, dev: 21, func: 0
Vendor ID: 8086h (intel)
Device ID: 22A8h, Revision ID: 54, Class: 04h (multimedia device)
Sub-Class: 01h (audio device)
IRQ: 255, INTA, Cache line: 64B, Latency: 0
BAR: 91400000h, 00000000h, 91834000h, 00000000h, 00000000h, 00000000h

So good, CSMWrap works at leas for some basic DOS programs on bare metal that would be never possible on systems without CSM...

---
DOS gives me freedom to unlimited HW access.

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