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<sect2 arch="powerpc" id="invoking-openfirmware">
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<title>Invoking OpenFirmware</title>
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There is normally no need to set up the BIOS (called OpenFirmware) on
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&arch-title; systems. PReP and CHRP are equipped with OpenFirmware,
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but unfortunately, the means you use to invoke it vary from
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manufacturer to manufacturer. You'll have to consult the hardware
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documentation which came with your machine.
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On &arch-title; Macintoshes, you invoke OpenFirmware with
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<keycombo><keycap>Command</keycap> <keycap>option</keycap>
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<keycap>O</keycap> <keycap>F</keycap></keycombo> while booting. Generally it
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will check for these keystrokes after the chime, but the exact timing
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varies from model to model. See
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<ulink url="&url-netbsd-powerpc-faq;"></ulink> for more hints.
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The OpenFirmware prompt looks like this:
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<informalexample><screen>
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</screen></informalexample>
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Note that on older model &arch-title; Macs, the default and sometimes
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hardwired I/O for OpenFirmware user interaction is through the serial
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(modem) port. If you invoke OpenFirmware on one of these machines, you
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will just see a black screen. In that case, a terminal program running
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on another computer, connected to the modem port, is needed to
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interact with OpenFirmware.
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The OpenFirmware on OldWorld Beige G3 machines, OF versions 2.0f1
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and 2.4, is broken. These machines will most likely not be able to
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boot from the hard drive unless the firmware is patched. A firmware
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patch is included in the <application>System Disk 2.3.1</application>
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utility, available from Apple at
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<ulink url="ftp://ftp.apple.com/developer/macosxserver/utilities/SystemDisk2.3.1.smi.bin"></ulink>.
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After unpacking the utility in MacOS, and launching it, select the
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Save button to have the firmware patches installed to nvram.