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Slimline Open Firmware (SLOF) is initialization and boot source code based on the IEEE-1275 (Open Firmware) standard, developed by engineers of the IBM Corporation.

The SLOF source code provides illustrates what's needed to initialize and boot Linux or a hypervisor on the industry Open Firmware boot standard.

Currently the SLOF source code is hosted on github at and provides:

  • Documentation
  • An Open Firmware implementation for prototyping, test, and debug
  • Low Level Firmware for IBM's JS20, JS21 and the YDL PowerStation (partially closed source)
  • Firmware for the emulated 'pseries' machine of QEMU