NAME    [Toc]    [Back]

     boot_mvme88k - mvme88k system bootstrapping procedures

DESCRIPTION    [Toc]    [Back]

   Cold starts
     When powered on, the mvme88k BUG firmware  will  proceed  to
its initialization,
  and  will boot an operating system if autoboot is enabled.  By sending
 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    [Toc]    [Back]
     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 environment.


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

FILES    [Toc]    [Back]

     /bsd                   default system kernel
     /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    [Toc]    [Back]

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

OpenBSD      3.6                        February     24,     2004