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10 lines
694 B
Markdown
10 lines
694 B
Markdown
OpenFirmware is a standard to defined a firmware's interfaces. It primarily uses the Forth programming language. It's available on most PCI Power Macs and all New World Power Macs by holding Command, Option, O, and F together during bootup.
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The bootpath for Old World Macs is usually set to "/AAPL,ROM". New World Macs specify "\\:tbxi" as the boot path instead.
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When using an Old World PCI Power Mac, it gets relocated from 0xFF800000 to 0x00400000 during boot-up, then instruction and data translations are enabled.
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There is also a section of NVRAM reserved for boot-up code called "NVRAMRC", ran each time the system is booted up.
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It gets compiled to native PowerPC code during boot-up.
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