Date: Tue, 10 Nov 2009 17:14:02 -0600 From: Peter Steele <psteele@maxiscale.com> To: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Converting a bootable USB stick in to bootable CD-ROM Message-ID: <7B9397B189EB6E46A5EE7B4C8A4BB7CB3394F75B@MBX03.exg5.exghost.com>
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I posted this on the -questions list but didn't get any replies. I have a F= reeBSD image that I install on USB sticks to build new systems. When the st= ick boots it automatically clones itself on the system's hard drive, creati= ng partitions and other configuration parameters that are programmed into t= he stick's cloning logic. I want to create a similar mechanism using a boot= able CD-ROM. The biggest difference in the process of course is that the CD= -ROM itself is read-only so clearly there needs to be an mfsroot involved i= n the process. I looked at how the FreeBSD Live CD is setup and the loader.= conf file has these lines: mfsroot_load=3D"YES" mfsroot_type=3D"mfs_root" mfsroot_name=3D"/boot/mfsroot" along with the file /boot/mfsroot.gz and no /etc/fstab. The fstab on my USB= stick version has root mounted as /etc/da0s1a and clearly that isn't going= to work. I changed my core BSD image accordingly, duplicating the mfsroot = settings in my loader.conf. I used the command below to create the iso file from the BSD image I prepar= ed. mkisofs -R -no-emul-boot -o /tmp/bsd.iso -b boot/cdboot /bsd When this iso is copied to a CD, it does boot. However, it doesn't seem to = be picking up the mfsroot config and complains that the system is running f= rom on a read-only file system, which of course is what I'm trying to avoid= . I assume I simply have the boot config setup wrong. I essentially want the = same kind of thing that's done for BSD Live. Can anyone point me to the rig= ht info for setting up this kind of bootable BSD CD?
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