For uClibc based floppyfw look at:

http://www.uclibc.org/FAQ.html#dev_systems


From: Ken Yap <ken_yap_aus@yahoo.com>
Subject: Re: Howto create package for floppyFW
Newsgroups: floppyfw.general
Date: Wed, 25 Jul 2001 17:10:35 +1000
Organization: Hyssing.net                                                                 

Ricardson wrote:
  
> Howto create package for floppyFW?

The package is a tar.bz2 archive. You can create it by tar Icf
foo.tar.bz2 blahblahblah

The package is unpacked in the / directory, so your package must have
relative pathnames from /.

Generally a package consists of a binary and any additional libraries,
which should go into lib/libsomething.so. If the program needs any
additional directories to run, perhaps empty, you should also provide them.

Let's look at dnrd.bz2, a package I created. It contains:

$ tar Itf dnrd.bz2
bin/
bin/dnrd
etc/                                  
etc/dnrd/
lib/
lib/libpthread-0.7.so
lib/libpthread.so -> libpthread.so.0
lib/libpthread.so.0-> libpthread.0.7.so

The last two are just symlinks for convenience.                                          

This package was made in a populated tree with the tar command I just                    
mentioned, so blahblahblah is just bin etc lib

Next you should create optional pre- or post- scripts to start your                       
program at boot time. They are called before and after modules are
installed and the network is brought up, respectively. In this case the
script is called post-dnrd.init and contains:

#!/bin/sh                                                                                 
. /etc/config
dnrd -k
DEBUG=''
BA="-a ${INSIDE_IP}"
NS=''
while read a b
do
         case $a in
         nameserver)
                 NS="$NS -s $b"
                 ;;
         esac
done < /etc/resolv.conf
dnrd -l $DEBUG $BA $NS

This just kills any running instance and starts a new one. It's not the                   
best startup script in the world. If you want your script to also be run
after any change of IP due to a new DHCP lease, you should put a call to
it in /etc/network.ini

When installing a package, copy the .bz2 and .init files to the                           
packages/ directory of the floppy and away you go.

The tricky bit is compiling the binary with the right shared libraries.