DOS ain't dead

CSM BIOS for EFI machines (Announce)

posted by RayeR , CZ, 28.05.2025, 20:54
(edited by RayeR on 29.05.2025, 03:57)

> I saw this on hackernews. PC BIOS for EFI machines. Alleges to boot
> FreeDOS in QEMU and some physical machines. I wonder if this could be
> improved.

Good idea, we discussed use of seabios before (remembers me biEFIrcate theme). Unfortunately cannot boot on my work legacy free HP Zbook core i7-11850H, nVidia RTX A2000 :(
https://ibb.co/ymw4GsDn

EDIT: it seems I hit the problem:
It is almost required to run CSMWrap with above 4G decoding disabled in your BIOS/UEFI. As UEFI firmwares are likely to place GPU's VRAM BAR above 4G, and legacy BIOS are 32bit which means it can only access the first 4G of memory.

I have to check if my SETUP has an option for 4G decoding disable, I doubt a bit...

BTW there are still modern MBs with relative good CSM support, this one can boot Win98 on 14th gen core :)
https://www.youtube.com/watch?v=G7qm3GFy9tg

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

Complete thread:

• CSM BIOS for EFI machines - Oso2k, 27.05.2025, 18:51
  • CSM BIOS for EFI machines - kerravon, 27.05.2025, 20:15
  • CSM BIOS for EFI machines - RayeR, 28.05.2025, 20:54
    • CSM BIOS for EFI machines - RayeR, 29.05.2025, 15:58
    • CSM BIOS for EFI machines - Zyzzle, 31.05.2025, 00:25
      • CSM BIOS for EFI machines - RayeR, 03.06.2025, 02:10
        • CSM BIOS for EFI machines - Zyzzle, 03.06.2025, 04:53
          • CSM BIOS for EFI machines - kerravon, 03.06.2025, 06:16
          • CSM BIOS for EFI machines - RayeR, 03.06.2025, 12:36
  • CSM BIOS for EFI machines - success! - RayeR, 11.06.2025, 04:32
    • CSM BIOS for EFI machines - success! - RayeR, 01.07.2025, 04:43
      • CSM BIOS for EFI machines - success! - Zyzzle, 07.07.2025, 02:43
        • CSM BIOS for EFI machines - success! - RayeR, 09.07.2025, 17:05
  • CSM BIOS for EFI machines - 0ffer, 24.06.2025, 14:22