CDBOOT(8) OpenBSD System Manager's Manual (i386) CDBOOT(8)NAMEcdboot - i386-specific second-stage CD-specific bootstrap
DESCRIPTIONcdboot 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 ALSOboot(8), boot_i386(8), mkhybrid(8)
Curtis E. Stevens, Phoenix Technologies and Stan Merkin, IBM, 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(5) 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.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
