i386-specific second-stage CD-specific
cdboot is a modified version of the i386
second-stage bootstrap program,
configured to be run by the OpenBSD El Torito CD-ROM
boot sector cdbr.
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 then sits in a loop, processing
commands given by the user. It accepts all the commands accepted by
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
- CD-specific second-stage bootstrap
cdbootconfiguration file (read from CD)
Boot the install kernel:
boot(8), boot_i386(8), mkhybrid(8)
Curtis E. Stevens and Stan Merkin, El Torito Bootable CD-ROM Format Specification, Version 1.0, January 25, 1995.
cdboot program first appeared in
By default, many CD creation programs restrict filenames to the
MS-DOS 8.3 format. Unless this is changed,
will not be able to read its
boot.conf(8) file. For example, with
-l option should be
ls command does not work on ISO 9660
(cd9660) filesystems, which are used on most CDs.