Building Busybox

First cd into the myboot/busybox-0.60.3 subdirectory.

Edit the file Conf.h as follows:

• Add or remove support for programs you do or do not want. For each program there is a #define BB_XXX line that can be commented out or not. Uncomment the BB_VI line, as you would probably need an editor. Leave the network related programs commented out if you do not enable network support, otherwise uncomment them. In our example we will not use network support. It's basically your choice what to put in or not. Though it may be possible to start Linux with an interactive shell instead of init, we will leave the init program in.
• Uncomment the BB_FEATURE_USE_TERMIOS line.

Edit the Makefile as follows:

• Append -m386 to the CFLAGS_EXTRA line.
• Uncomment the CC= line below the comment about uClibc and change it to CC=/home/lennartb/myboot/uclibc-dev/bin/gcc
• You could enable LFS support, as you already have selected it in the uClibc library as well.

Now build the program.

make
make PREFIX=/home/lennartb/myboot/rootfs install

Because you have linked with the dynamic uClibc library and these are not installed in the host system's /lib directory, the program cannot run. There is a trick to work around it: by using the chroot command, you can run a program whose root directory is the specified directory. Become root and type the following command:

/usr/sbin/chroot /home/lennartb/myboot/rootfs /bin/sh

The shell that you are now in is the shell inside the
/home/lennartb/myboot/rootfs directory. This shell thinks that this rootfs directory is in fact the root directory: even the shared libraries of uClibc in the /lib directory will be found. Type the command ls / and it will be clear. Exit the chroot subshell with Control-D and everything will be back to normal.

Now you have most common Unix utilities including an editor and a shell and you've spent only 576kB of disk space!