Booting from a firmware Forth loader was how the early Sun SunOS (BSD) workstations did their thing - you could hotkey to stop the default OS load and boot from an image on an alternative drive, across a network, or modify the Forth loader to <imagination>
That forth system is also where Device Trees originated. Parts of the Linux kernel driver interface show that heritage in the naming conventions, OF_* == OpenFirmware.
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Booting from a firmware Forth loader was how the early Sun SunOS (BSD) workstations did their thing - you could hotkey to stop the default OS load and boot from an image on an alternative drive, across a network, or modify the Forth loader to <imagination>
That forth system is also where Device Trees originated. Parts of the Linux kernel driver interface show that heritage in the naming conventions, OF_* == OpenFirmware.