The u-boot for power46 never did work with Revision 2204 (and possibly others). It needs an updated package, which I still haven't gotten around to putting online anywhere; mostly because it's a bit of a "phantom" build which Stskeeps somehow got working. If I do a make clean then it steadfastly refuses to build any more, but I can successfully edit the config files and make it 0x38000 in size, and also add Matan's patches to remove watchdog reset amongst others, and then rebuild it (as long as I do not clean first). It's a bit odd but it does definitely work on my N900, which is a 2204.

The old package, based on the sterling work done by ali1234 here, was unfortunately the cause of all the "Starting kernel..." and then getting no further problems people were having, which could only be resolved by a battery pull (and resulted in many distrusting u-boot because it was notoriously a PITA to remove).