Hey.I watched this thread on the old website.Then I found out that the webiste moved.Anyway, I wanted to post some links i've found.
Openschemes.com - Articles Building the spmp3050 arm-elf-gcc toolchain on Fedora for idiots like us
libspmp3050 - Project Hosting on Google Code
I am also interested to use linux on those Sunplus PMPs.I hope, those links will help you guys.