Why don't you try some more recent Binaries? To build them yourself or something.

Not sure if it's the most recent Release but it seems to support the N900, is hardfp and got a lot of fixes compared to the maemo softfp userspace binaries.

http://processors.wiki.ti.com/index.php/RN_5_01_01_01

SDK: http://software-dl.ti.com/dsps/dsps_...5_01_01_01.bin