As Edmund reported previously, also I found that L4-Linux (2.0.21) could boot but not work well on my 486 PC (of course, I added -nopentium option for rmgr). However, same kit (fiasco/rmgr/sigma0 /glinux) works well on Pentium PC.
I think someone said that "-nopentium" has no effect on a 486. Confusingly, the word "Pentium" appears on the console in any case, whatever you do.
I have been unable to do remote debugging at any speed other than 9600. Nothing I do on the host seems to affect the speed used by the host, so I have to put "-comspeed 9600" as an argument to I forget which module on the target. Then it works, more or less. If anyone has a solution, I'd be grateful.
Edmund