install disk bootstrap software
utility prepares a disk for
The OpenBSD/alpha disk bootstrap software is split into two parts: a 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 second-stage boot program
that resides in the filesystem proper (typically with the name
). 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
numbers that have been hard-coded into it by
. The second-stage boot program
locates and loads the kernel.
The second-stage boot program and the prototype code for the first-stage boot
program can be found in /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
The options recognized by installboot
- Do not actually write anything on the disk.
- Verbose mode.
The arguments are:
- The name of the second-stage boot program in the file
system where the first-stage boot program is to be installed.
- The name of the prototype file for the first-stage boot
- The name of the device corresponding to the raw whole-disk
partition (the “raw partition”) of the disk on which the
first-stage boot program is to be installed.
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:
# cp /usr/mdec/boot /boot
# /usr/mdec/installboot -n -v /boot /usr/mdec/bootxx /dev/rsd0c
And if the information supplied looks right, run the above without the
The alpha installboot
command first appeared in
The OpenBSD/alpha boot blocks can only load kernels from disks'
“a” partitions. (However, the second-stage boot program may be
located on any FFS file system partition on the disk.)