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OXOS v0.1

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@kooscode kooscode released this 16 Oct 02:37
· 75 commits to main since this release
v0.1
d868867

First release of OXOS: a clean-room, open-source Xbox kernel in a fully open 1 MB BIOS image.

Download: bios_v0.1.bin (1 MB, SHA-256 703fba282a052dfbff8241bf5b410a86a89a619a5a287fb13820b0c008dcfbd7)

What works (in xemu)

  • The dashboard (e.g. the copyright-free xemu HDD image), Halo and Halo 2 (playable), and UDF (DVD-video) discs.
  • Boots without an MCPX boot ROM file (our reset code runs the X-codes), and through the real MCPX 1.0 boot ROM.
  • Stock locked hard disks unlock (EEPROM key handling from XboxDev/cromwell).
  • Own boot splash.

Using it in xemu

  1. Open Machine → Settings → System.
  2. Set Flash (BIOS) File to bios_v0.1.bin and leave MCPX Boot ROM File empty.
  3. Use an HDD image such as xemu's copyright-free one.

Known limitations

  • Not tested on a real console yet. The TV-encoder mode tables are still missing, so expect no picture on real TVs.
  • No certificate key.
    • Saves from a stock console do not verify under OXOS (and the other way round).
    • System Link only works between OXOS consoles.
    • Saves made under OXOS work fine among themselves.
  • Targets console revisions 1.0–1.5 (MCPX 1.0/1.1).

Contents and sources (GPL-2.0)

  • Kernel, 2BL and reset code: this repository at tag v0.1. Build with cd kernel && make BUILD=build-release SELFTEST=0 build-release/bios.bin.
  • MCPX header, X-code table and EEPROM key states: XboxDev/cromwell at commit 86f547387184d1001d377cce97d3756c8acf91cc (GPL-2.0), fetched by the build.
  • Contains no Microsoft code. Not affiliated with or endorsed by Microsoft; "Xbox" is a trademark of Microsoft Corporation.
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