installboot - install disk bootstrap software
installboot [-nv] boot bootxx rawdiskdevice
The installboot utility prepares a disk for bootstrapping.
The OpenBSD/alpha disk bootstrap software is split into two
small first-stage boot program that is written into the
disklabel area of
a disk (and hence is limited in size to 7680 bytes), and a
boot program that resides in the filesystem proper (typically with the
name /boot). The first-stage boot program is loaded into
memory by the
SRM console software. After receiving control of the system, it loads
the second-stage boot program from a set of filesystem block
have been hard-coded into it by installboot. The secondstage boot program
locates and loads the kernel.
The second-stage boot program and the prototype code for the
boot program can be found in /usr/mdec/boot and
/usr/mdec/boot may be installed simply by copying
it to the root
directory of the partition you wish to boot from, but after
it is installed
installboot must be run.
The options recognized by installboot are as follows:
-n Do not actually write anything on the disk.
-v Verbose mode.
The arguments are:
boot The name of the second-stage boot program in
the file system
where the first-stage boot program is to
bootxx The name of the prototype file for the firststage boot
rawdiskdevice The name of the device corresponding to the
partition (the ``raw partition'') of the disk
on which the
first-stage boot program is to be installed.
boot resides in the FFS file system mounted on / from
``sd0a'', you would
install the first-stage boot program on the disk (and therefore make the
disk bootable) by using the command:
installboot /boot /usr/mdec/bootxx /dev/rsd0c
disklabel(8), init(8), sysctl(8)
The alpha installboot command first appeared in NetBSD 1.2.
The OpenBSD/alpha boot blocks can only load kernels from
partitions. (However, the second-stage boot program may be
any FFS file system partition on the disk.)
Installboot requires simultaneous access to the mounted file
the disks' raw partition. That is not allowed with the kernel
securelevel variable (see sysctl(8)) set to a value greater
than one, or
with securelevel set to one if the ``boot'' program resides
in a file
system on the disk's raw partition.
OpenBSD 3.6 January 16, 1997
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