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NAME    [Toc]    [Back]

     boot_macppc - macppc system bootstrapping procedures

DESCRIPTION    [Toc]    [Back]

   System startup
     When powered on, after a panic, or if the system is rebooted
     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 otherwise.

   Boot process description    [Toc]    [Back]
     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

   Boot process options    [Toc]    [Back]
     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    [Toc]    [Back]
     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
     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 multiuser
  boot  cycle.   It  is also possible to force other behaviours from ddb.

   Accessing the PROM    [Toc]    [Back]
     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
     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.

FILES    [Toc]    [Back]

     /bsd               default system kernel
     /usr/mdec/ofwboot  system bootstrap (usually installed on  a
                        FAT  partition or an Apple HFS partition,
to be readable
 by Open Firmware)

SEE ALSO    [Toc]    [Back]

     ddb(4), boot_config(8),  halt(8),  init(8),  installboot(8),
     savecore(8), shutdown(8)

OpenBSD      3.6                       September     22,     2002
[ Back ]
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