A.3. Construction

A.3.1.1. Build a new kernel

bash# cd /usr/src/linux bash# make menuconfig

Be sure to configure support for the following:

• 386 processor

• Floppy disk

• RAM disk

• Second extended (ext2) filesystem

• Virtual console

• Audio hardware

• CD-ROM hardware

• ISO-9660 and Joliet filesystems

bash# make dep bash# make clean bash# make bzImage

A.3.1.2. Copy the kernel to diskette

Place the boot disk in drive fd0

bash# cp /usr/src/linux/arch/i386/boot/bzImage /mnt/boot/vmlinuz bash# mount /dev/fd0 /mnt

A.3.1.3. Install the LILO boot loader

bash# lilo -r /mnt

A.3.1.4. Unmount the boot disk

bash# cd / bash# umount /mnt

A.3.2.1. Create additional device files

A.3.2.2. Install the gunzip binary

bash# cd /usr/src/gzip-1.2.4a bash# export CC="gcc -mcpu=i386" bash# ./configure --host=i386-pc-linux-gnu bash# make bash# strip gzip bash# cp gzip ~/staging/bin bash# ln -s gzip ~/staging/bin/gunzip

Don't forget to verify library requirements, check the ownership and check permissions on the gzip binary.

A.3.2.3. Write a startup script to mount a compressed floppy

Use a text editor to create the following script and save it as ~/staging/etc/init.d/usr_image

#!/bin/sh # # usr_image - load compressed images from floppy into ramdisk and # mount on /usr. # echo -n "Is there a compressed diskette to load for /usr [y/N]? " read REPLY if [ "$REPLY" = "y" ] || [ "$REPLY" = "Y" ]; then echo -n "Please insert the /usr floppy into fd0 and press <ENTER>." read REPLY echo "Clearing /dev/ram1." dd if=/dev/zero of=/dev/ram1 bs=1k count=4096 echo "Loading compressed image from /dev/fd0 into /dev/ram1..." (dd if=/dev/fd0 bs=1k | gunzip -cq) >/dev/ram1 2>/dev/null fsck -fp /dev/ram1 if [ $(($?)) -gt $((1)) ]; then echo "Filesystem errors on /dev/ram1! Manual intervention required." else echo "Mounting /usr." mount /dev/ram1 /usr fi fi # # end of usr_image

Configure the script to run right after root is mounted.

bash# ln -s ../init.d/usr_image ~/staging/etc/rcS.d/S21usr_image

A.3.2.4. Create a compressed root disk

bash# cd / bash# dd if=/dev/zero of=/dev/ram7 bs=1k count=4096 bash# mke2fs -m0 /dev/ram7 bash# mount /dev/ram7 /mnt bash# cp -dpR ~/staging/* /mnt bash# umount /dev/ram7 bash# dd if=/dev/ram7 of=~/phase8-image bs=1k bash# gzip -9 ~/phase8-image

Insert the diskette labled "root disk" into drive fd0.

bash# dd if=~/phase8-image.gz of=/dev/fd0 bs=1k

A.3.3.1. Create a staging area

bash# mkdir ~/usr-staging bash# cd ~/usr-staging bash# mkdir bin lib bash# mkdir -p share/termcap/l

A.3.3.2. Install the mp3blaster program

Download the latest version of mp3blaster source code from its home at http://www.stack.nl/~brama/mp3blaster.

bash# cd ~/usr/src/mp3blaster-3.13 bash# ./configure bash# make bash# cp src/mp3blaster ~/usr-staging/bin

A.3.3.3. Copy additional libraries and terminfo

Use ldd to find out which libraries are needed for mp3blaster.

The following is an example from the author's development system. It is possible that different systems may yield slightly different results in terms of library requirements.

bash# cd ~/usr-staging/lib bash# ldd ~/usr-staging/bin/mp3blaster bash# cp /usr/lib/ncurses.so.5.0 . bash# cp /usr/lib/stdc++.so.3 . bash# cp /lib/libm.so.6 . bash# cp /usr/lib/libgcc_s.so.1 . bash# cd ~/usr-staging/share/terminfo/l bash# cp /usr/share/terminfo/l/linux .

A.3.3.4. Make a compressed image and copy it to diskette

bash# cd / bash# dd if=/dev/zero of=/dev/ram7 bs=1k count=4096 bash# mke2fs -m0 /dev/ram7 bash# mount /dev/ram7 /mnt bash# cp -dpR ~/usr-staging/* /mnt bash# umount /dev/ram7 bash# dd if=/dev/ram7 of=~/mp3blaster-image bs=1k bash# gzip -9 ~/mp3blaster-image

Insert the diskette labled "mp3blaster" into drive fd0.

bash# dd if=~/mp3blaster-image.gz of=/dev/fd0 bs=1k