BOOT_X68K(8)        OpenBSD System Manager's Manual (X68K)        BOOT_X68K(8)

NAME
     boot - system bootstrapping procedures

DESCRIPTION
   Power fail and crash recovery
     Normally, the system will reboot itself at power-up or after crashes.  An
     automatic consistency check of the file systems will be performed, and
     unless this fails, the system will resume multi-user operations.

   Cold starts
     The X68000/X68030 system boots from the device which is determined by the
     configuration of battery-backuped SRAM.  By default, the boot ROM at-
     tempts to boot from a floppy disk drive (from 0 to 3) first, and then
     from a hard disk (SASI or SCSI).  On the OpenBSD/X68k, booting from par-
     tition ``a'' of SCSI disks (sd?a) and 2HD floppy disks (fd?a, fd?c) is
     currently supported.

     First, the initial program loader of IOCS ROM or SCSI disk (or equiva-
     lent) reads the boot program at the top of the disk, and then the boot
     program loads the OpenBSD kernel /bsd which is in the same partition of
     the disk.  If you press the `SHIFT' key when booting, the boot program
     enables you to change the boot flag RB_SINGLE with the `SHIFT' key, and
     to choose which kernel to be used with arrow keys.  If the LED of the
     `HIRAGANA' key is turned on, the boot program adds the RB_KDB flag and
     tries to boot the system in debug mode; see ddb(8) for details.

     Note for X68030+MC68030 systems: Nothing special to be attended to; you
     can boot OpenBSD just like as other operating systems such as Human68k
     and OS-9.

     Note for X68030/040turbo(68040 accelerator by BEEPs) systems: OpenBSD can
     boot under 040 mode.  It can also boot under 030 mode if you have an
     MC68030 on the board.

     Note for X68000/Xellent30(68030 accelerator by TSR) + MC68030 systems: In
     order to boot OpenBSD, you must choose 030 mode by using CH30.SYS, which
     must reside in the battery-backuped SRAM.

     Note for X68000/Jupiter-X(68040/060 accelerator by FTZ-net) systems: The
     system must be in 040/060 processor mode.

FILES
     /bsd                system code
     /usr/mdec/xxboot    boot program, xx is disk type

SEE ALSO
     reboot(2),  disklabel(8),  halt(8),  reboot(8),  shutdown(8)

OpenBSD 2.6                      June 16, 1996                               1
