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NAME    [Toc]    [Back]

     boot_mac68k - mac68k-specific  system  bootstrapping  procedures

DESCRIPTION    [Toc]    [Back]

   Power fail and crash recovery
     Normally,  the  OpenBSD kernel on the mac68k architecture is
booted from
     the native operating system by means of an application  program.  When the
     kernel  takes  over,  it  initializes itself and proceeds to
boot the system.
     An automatic consistency check of  the  file  systems  takes
place, and unless
  this  fails,  the system comes up to multi-user operations.  The proper
 way to shut the system down is with the shutdown(8)  command.

     If  the  system  crashes, it will enter the kernel debugger,
ddb(4), if it
     is configured in the kernel.  If the debugger is not present
or has exited,
  the  system  will attempt a dump to the configured dump
device (which
     will be automatically recovered with savecore(8) during  the
next boot cycle).
   After  the  dump  completes (successful or not), the
system will attempt
 a reboot.

     On most mac68k machines with ``soft-power'' after the  IIcx,
the power
     switch  can  be  physically rotated and locked in the ``on''
position.  The
     native OS can  be  configured  to  automatically  start  the
OpenBSD boot program.
  Additionally, the OpenBSD boot program can be configured to boot
     OpenBSD without intervention.  When a system is  so  configured, it can
     crash  or  lose  power and reboot back to a fully multi-user
state without
     any intervention.

   The boot application    [Toc]    [Back]
     The boot application runs in the native OS  on  the  system.
It has a dialog
  where  booting preferences may be changed and an option
whereby these
     options may be saved.  The preferences  are  stored  in  the
program itself,
     not  in  a  preferences  folder,  thus allowing two separate
copies of the
     program to be configured differently (e.g., to boot  different bsd or
     bsd.test, or to boot from two different drives).

     One  option  that  may be specified is a boot to single-user
mode.  This
     stops the boot process very early on and allows system maintenance.  If
     one  wishes  to  provide  some security at this phase of the
boot, remove the
     ``secure'' option from ttye0 in the ttys(5) file.

     Another useful option that may be specified is the  ``serial
console'' option.
   This will allow a serial device (terminal or computer) to act as a
     console for the system.  This device must be  configured  to
use 9600 baud,
     eight  bits, no parity, and one stop bit (9600-8N1).  Either
the printer
     port or the modem port (tty01 and tty00,  respectively)  may
be used for

     It  is  sometimes  useful to boot a kernel that resides in a
folder in native
 OS rather than from the usual location in  the  OpenBSD
file system.
     A radio button is supplied for this purpose.  Note that some
     will not run properly if the kernel is  not  found  as  /bsd
within the
     OpenBSD file system.

FILES    [Toc]    [Back]

     /bsd  system kernel

SEE ALSO    [Toc]    [Back]

     ddb(4), ttys(5), savecore(8), shutdown(8)

OpenBSD      3.6                           July      1,      1995
[ Back ]
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