N.S provides ALSA and Framebuffer drivers for linux which use vsa rom. As far as I know, there isn't power management driver from N.S yet.
xpressLoader has different GDT table with linux kernel. If you fix this, lilo rom(?) may work. If you have BootOS source from N.S., porting only linuxbiosmain.c to boot rom works fine with vsa rom. That was my case.
What did you get working with the VSA rom? Audio? Power managment?
-Bari