boot_macppc man page on OpenBSD

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BOOT_MACPPC(8)	   OpenBSD System Manager's Manual (MacPPC)	BOOT_MACPPC(8)

     boot_macppc - macppc system bootstrapping procedures

   System startup
     When powered on, after a panic, or if the system is rebooted via
     reboot(8) or shutdown(8), the Open Firmware will proceed to its
     initialization, and will boot an operating system if the auto-boot?
     variable is set to ``true'', or will wait for interactive commands

   Boot process description
     The Apple Open Firmware will normally load the kernel from the device and
     filename as instructed by the boot-device and boot-file variables.	 If
     the boot-file variable is empty, the OpenBSD bootloader will look for a
     kernel named bsd, unless a different filename has been specified in the
     boot command.  To reset this variable to its default, empty, value, type
     the following:

	  ok set-default boot-device

     The OpenBSD bootstrap program is named ``ofwboot''.  It can be installed
     either in a HFS partition or in a MSDOS partition on the disk.  If MBR
     partitioning is chosen for the disk, the bootstrap program will be
     installed automatically during the OpenBSD installation procedure.	 For
     HFS shared disks, the ofwboot file must be installed manually.  The
     ofwboot program can be loaded from any Open Firmware recognized disk or
     network device.

   Boot process options
     If invoked manually without parameters, or if the specified kernel could
     not be loaded, the OpenBSD bootloader will let the user enter a boot
     device, kernel filename and boot options.

     If the special line exit is entered, the bootloader will attempt to
     restart the machine.

     The file specification used is of the form:
	   promdev:partition/filename options
     where: ``promdev'' is an optional Open Firmware device name (such as
     ``hd'' or ``ide'') and ``partition'' is an optional disk partition
     number.  Normal line editing characters can be used when typing the file

     The following options are recognized:

	   -a	 Prompt for the root filesystem and swap devices after the
		 devices have been configured.
	   -c	 Enter the ``User Kernel Config'' mode upon startup (see
	   -d	 Enter the debugger, ddb(4), as soon as the kernel console has
		 been initialized.
	   -s	 Boot the system single-user.  The system will be booted
		 multi-user unless this option is specified.

   Abnormal system termination
     In case of system crashes, the kernel will usually enter the kernel
     debugger, ddb(4), unless it is not present in the kernel, or it is
     disabled via the ddb.panic sysctl.	 Upon leaving ddb, or if ddb was not
     entered, the kernel will halt the system if it was still in device
     configuration phase, or attempt a dump to the configured dump device, if
     possible.	The crash dump will then be recovered by savecore(8) during
     the next multi-user boot cycle.  It is also possible to force other
     behaviours from ddb.

   Accessing the PROM
     The prom can only be accessed during system reset, or at power-up.	 To
     enter Open Firmware, press and hold ``Cntrl'' ``Cmd'' ``o'' ``f'' as the
     machine resets until it enters the Open Firmware debugger.

     On an Xserve using serial console the System Identifier button is used to
     enter Open Firmware instead of the keyboard.  To enter Open Firmware,
     hold down the System Identifier button while pressing the Power button.
     When the upper LED bank begins lighting up in sequence, repeatedly press
     the System Identifier button until the seventh LED from the right is
     highlighted in the lower bank.  Now hold the System Identifier button for
     two seconds, until all the top row LEDs light up.

     /bsd		default system kernel
     /bsd.rd		standalone installation kernel, suitable for disaster
     /usr/mdec/ofwboot	system bootstrap (usually installed on a stand-alone
			FAT partition or an Apple HFS partition, to be
			readable by Open Firmware)

     ddb(4), boot_config(8), halt(8), init(8), reboot(8), savecore(8),

OpenBSD 4.9			January 3, 2010			   OpenBSD 4.9

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