DOS ain't dead

CSM wrap 2.0.0 (Announce)

posted by Laaca , Czech republic, 21.02.2026, 11:03

In case you missed it, CSMWrap Version 2.0.0 is released!
I have not tried it because my machine has working CSM BIOS module but for people with UEFI only are this great news.

https://github.com/FlyGoat/CSMWrap/releases/tag/2.0.0

Major New Features

PCI BAR Relocation - Automatically relocate PCI BARs from >4GB to <4GB, eliminating the need to disable "Above 4G Decoding" in UEFI settings.
PCIe Resizable BAR Support - Shrink large BARs (e.g., 4GB GPU VRAM) to 256MB using PCIe ReBAR capability, eliminating the need to disable "Resizable Bar/Smart Access Memory" in UEFI settings.
BIOS Proxy Helper Core - Dedicate an AP for BIOS calls from the BSP. This allows usage of CSMWrap with legacy OSes calling BIOS routines from Virtual 8086 Mode and other improvements.
MP Table Generation - Generate Intel MPS 1.4 tables from ACPI MADT for legacy OSes that don't support ACPI.
SMBIOS 3.0 → 2.x Synthesis - Generate SMBIOS 2.x entry point when only 3.0 is available.
Boot Device Detection - Auto-detect boot drive and build BBS table with correct priority.


Platform Support

IOMMU Disable - Automatically disable Intel VT-d and AMD-Vi before legacy OS handoff.
x2APIC Handling - Transition to xAPIC mode if possible or configure ExtINT passthrough for PIC interrupts.
Intel PIT Workaround - Fix timer interrupts on Arrow Lake, Meteor Lake, Panther Lake.
AMD RDNA+ Detection - Force SeaVGABIOS for RDNA/RDNA2/RDNA3 GPUs with broken legacy OpROMs.

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DOS-u-akbar!

Complete thread:

• CSM wrap 2.0.0 - Laaca, 21.02.2026, 11:03 (Announce)
  • CSM wrap 2.0.0 - Zyzzle, 21.02.2026, 23:02
  • CSM wrap 2.0.0 - RayeR, 23.02.2026, 17:28