install bootstrap on a disk
installboot installs bootstrap on the
specified disk. The exact process used depends on the system architecture,
however there is generally a primary bootstrap (often known as a boot block)
and a secondary bootstrap (often known as a boot loader). Some architectures
only require a single stage bootstrap, which is written to the beginning of
The options are as follows:
- Perform a dry run - do not actually write to the disk.
- Prepare filesystem. This will create a new filesystem on the partition reserved for the boot loader on architectures that require one.
- Specify the mount point of the root filesystem to operate on, defaulting to /.
- Increase verbosity during operation.
- Specify the disk to install the bootstrap on. This may be specified using a full pathname, an abbreviated disk form, or a disklabel UID.
- Specify the file to use for the primary bootstrap. If not specified, the default for this architecture will be used.
- Specify the file to use for the secondary bootstrap. If not specified, the default for this architecture will be used.
In its most basic form, to install bootstrap on disk sd0, using the default primary and secondary bootstrap files:
# installboot sd0
To install bootstrap on an OpenBSD amd64 machine, using /usr/mdec/biosboot as the primary bootstrap and /usr/mdec/boot as the secondary bootstrap:
# installboot -v wd0 /usr/mdec/biosboot /usr/mdec/boot