Open Firmware was a bootloader used on PowerPC Macintoshes. It is not actively used anymore.
Boot in OpenFirmware Prompt
Hold command-option-o-f during boot to get the Open Firmware prompt.
List hardware with memory addresses:
dev / ls
List aliases of devices:
For example, if this list may define a shortcut "hd" (hard disk) for the following hardware address:
List File System
Lists the files of partition 5 of the "hd" device.
Lists the files of the default partition of the "hd" device.
To eject a CD:
Boot with the default settings (as stored in the boot-device NVRAM setting):
Boot with the file yaboot, on partition 5 of the "hd" device:
Boot with the file with TYPE code "tbxi" in the root folder of the default partition of the "hd" device (this is the default):
Display all NVRAM settings:
Change an NVRAM setting:
setenv boot-device mac-io/ata-4@1f000/@0:2,\System\Library\CoreServices\BootX
- Fundamentals of Open Firmware, Part I: The User Interface
- Booting Mac OS X. Excellent overview at kernelthread.com
- Technical Note TN2001: Running files from a hard drive in Open Firmware. Slightly off-topic, but interesting nonetheless.
- Open Firmware Quick Reference. Formal description of a few commands.