I have tried m0n0wall with many Nokia IP series boxes.
Discussion here:
http://forum.m0n0.ch/index.php/topic,1384.0.htmlThe only Nokia boxes the m0n0wall seems to work in are IP 110/120/130 and 330. I think it might work in 440 too. The 440 is basically just a clone PC with real Intel motherboard in it.
Some time ago, m0n0wall v1.3 did not boot in IP 1xx boxes either; it made a panic and reboot. It was fixed however. What I understand, it is an issue with the FreeBSD kernel so the fixes should go there if anyone ever is willing to do it. I presume these Nokia boxes are somewhat rare and not many people have them (I mean, so much that it's interesting to fix it).
There is a further problem with IP 1xx series, too:
http://forum.m0n0.ch/index.php/topic,2373.0.html