I just upgrade the ScratchboxToolkitMultiCpu-2.3 to include toolchain/rootstrap for armev4b and mipsel using gcc-4.2.1 and
uClibc-0.9.30.1.
( from Landley's
http://impactlinux.com/code/firmware/downloads/binaries/ )
The livecd allows to use either cross or native compiler , nslu2 and openwrt_ala_kamikaze are prefenrentially aimed at !!!
https://sourceforge.net/projects/toysbox/files/scratchboxToolkit/ScratchboxMultiCpu-2.3-1.iso/download see also
http://sites.google.com/site/learnembeddedlinuxnow/