To create a bootable CD-ROM you may follow the instructions in the
Bering User's Guide Chapter 10, with the exception that you don't have
to build a new initrd if you use initrd_ide_cd.lrp
renamed to initrd.lrp.
The approach described in the Bering User's Guide has the disadvantage that due to bad BIOS implementations, the CD may not boot in older computers.
We will describe the more general approach the Dachstein versions used to create a bootable CD-ROM, which allows to boot from CD on every computer that is able to boot from CD.
Main trick is to provide a bootable 1,44Mb floppy diskimage on the CD-ROM.
Format a floppy disk, add a msdos filesystem and make it bootable with syslinux:
# fdformat /dev/fd0 # mkfs.msdos /dev/fd0 # syslinux -sf /dev/fd0
Now mount the floppy and copy the kernel (linux), syslinux.cfg and
syslinux.dpy from the Bering-uClibc diskimage onto the floppy. Copy
initrd_ide_cd.lrp renamed to
initrd.lrp onto the floppy.
Before umounting the floppy edit syslinux.cfg on the floppy disk.
Edit syslinux.cfg and make shure the
PKGPATH points to the CD-ROM device and floppy as well (that's the
place where you store your configuration settings).
display syslinux.dpy timeout 0 default linux initrd=initrd.lrp init=/linuxrc rw root=/dev/ram0 boot=/dev/fd0:msdos PKG PATH=/dev/cdrom:iso9660,/dev/fd0:msdos LRP=root,etc,loca.....
Now you have a bootable floppy for your CD.
Edit syslinux.cfg and change the LEAFCFG
variable to point to your floppy device (so you can easily add or
remove packages to load without buring a new ISO-image:
display syslinux.dpy timeout 0 default linux initrd=initrd.lrp init=/linuxrc rw root=/dev/ram0 LEAFCFG=/dev/fd0:msdos
This will be your bootable the floppy for the CD creation.
The floppy device will be used to store your configuration settings.
Now you are ready to build your CD-ROM. Create a new directory and put all packages you like to have available on your CD into it.
Next dump your boot floppy build above into the same directory.
# dd if=/dev/fd0 of=bootdisk.ima bs=8k
Create an ISO-Image from that directory and burn it.
# mkisofs -v -b bootdisk.ima -c boot.catalog -r -J -f -o Bering-uClibc-CD.iso # cdrecord -v dev=[target] Bering-uClibc-CD.iso
Packages can be added or removed in a flexibel way by
declaring/undeclaring them in lrpkg.cfg
(Bering-uClibc <= 2.1) or leaf.cfg
(Bering-uClibc >= 2.2) on a new formatted floppy.
Additionally your configuration settings for all packages can be stored on the same floppy.
To add or remove packages just edit
lrpkg.cfg on a blank formatted floppy disk - all
entries on one line. It looks like:
root,etc,local,modules,pump,keyboard,shorwall,dnscache,webconf
Edit leaf.cfg on a blank formatted floppy
disk, add your packages to LRP and change PKGPATH to point to your
CDROM and the floppy device.
LRP="root config etc local modules iptables dnsmasq keyboard shorwall ulogd libz mawk libssl libm ezipupd dropbear webconf ppp pppoe libpcap" PKGPATH=/dev/fd0:msdos,/dev/cdrom:iso9660 syst_size=8M log_size=2M
The order in PKGPATH is important!
The leftmost entry will be loaded last - so your packages will be load first from CDROM and then from /dev/fd0. This will overwrite the configuration with the settings you stored on the floppy.
You can backup your configuration changes onto the floppy, you
have declared
leaf.cfg/lrpkg.cfg.
To only backup the changes in configuration and not the complete packages, which may be too big to fit onto a floppy, choose "partial backup" and /dev/fd0 as destination for the packages.
Partial backup does not work for etc.lrp.