BOOT_MVME88K(8)    OpenBSD System Manager's Manual (MVME88K)   BOOT_MVME88K(8)

NAME
     boot_mvme88k - mvme88k system bootstrapping procedures

DESCRIPTION
   Cold starts
     When powered on, the mvme88k BUG firmware will proceed to its initializa-
     tion, and will boot an operating system if autoboot is enabled.  By send-
     ing a ``break'' to the serial line during the initialization sequence, it
     is possible to stop the boot process and interact with the BUG.

   Warm starts
     After a panic, or if the system is rebooted via reboot(8) or shutdown(8),
     the BUG firmware will only restart the operating system if autoboot is
     enabled and ``Auto Boot at power-up only'' is disabled in the BUG envi-
     ronment.

   Boot process options
     The BUG firmware will let the user enter a boot device identification,
     kernel filename and boot options.  If no filename is specified, /bsd will
     be used by default.

     The following boot options are recognized:

           -a    Prompt for the root filesystem device after the devices have
                 been configured.
           -b    On the next system reboot, always halt the system, even if a
                 reboot is required.
           -c    Enter the ``User Kernel Configuration'' mode upon startup
                 (see boot_config(8)).
           -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 mul-
                 ti-user unless this option is specified.

   Abnormal system termination
     In case of system crashes, the kernel will usually enter the kernel de-
     bugger, 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.

FILES
     /bsd                   default system kernel
     /bsd.rd                standalone installation kernel, suitable for dis-
                            aster recovery
     /usr/mdec/bootxx       primary bootstrap code for ``ffs'' file system on
                            SCSI disks
     /usr/mdec/bootsd       secondary bootstrap code for SCSI disks (usually
                            also installed as /bootsd)
     /usr/mdec/bootst       SCSI tape bootstrap code
     /usr/mdec/netboot      network bootstrap code
     /usr/mdec/tftpboot     tftp-only network bootstrap code
     /usr/mdec/stboot       Motorola VID block put as first file on bootable
                            SCSI tapes

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

OpenBSD 4.7                     January 3, 2010                              1
