NAME
cdboot
—
i386-specific second-stage CD-specific
bootstrap
DESCRIPTION
cdboot
is a modified version of the i386
second-stage bootstrap program, boot(8), configured to be run by the OpenBSD
El Torito CD-ROM boot sector cdbr.
cdboot
will look for an
/etc/boot.conf configuration file on the CD-ROM. If
it finds one, it processes the commands within it.
boot.conf processing can be skipped by holding down
either Control key as cdboot
starts.
cdboot
then sits in a loop, processing
commands given by the user. It accepts all the commands accepted by
boot(8).
If no commands are given for a short time,
cdboot
will then attempt to load an
OpenBSD kernel from the CD. It first looks for the
install kernel bsd.rd in the standard i386 release
directory (e.g. /3.6/i386/bsd.rd), then for
/bsd. It may be told to boot an alternative kernel,
either by commands in the boot.conf file, or by
commands typed by the user at the boot>
prompt.
FILES
- /usr/mdec/cdboot
- CD-specific second-stage bootstrap
- /etc/boot.conf
cdboot
configuration file (read from CD)
EXAMPLES
Boot the install kernel:
boot> bsd.rd
SEE ALSO
STANDARDS
Curtis E. Stevens and Stan Merkin, El Torito Bootable CD-ROM Format Specification, Version 1.0, January 25, 1995.
HISTORY
The cdboot
program first appeared in
OpenBSD 3.6.
CAVEATS
By default, many CD creation programs restrict filenames to the
MS-DOS 8.3 format. Unless this is changed, cdboot
will not be able to read its boot.conf(8) file. For example, with
mkhybrid(8) the
-l
option should be specified.
BUGS
The ls
command does not work on ISO 9660
(cd9660) filesystems, which are used on most CDs.