> > > I'll try to rm all the objs and recompile, maybe it's a compilation
> > > mistake.
> > > The kernel is ~2 weeks newer than the userland, can it come from this ?
> > 
> > It shouldn't, but it's worth the try. If this doesn't fix the problem,
> > you can try adding printf's into msdos mount function (one could also
> > use ddb to trace this -- though I don't know the exact commands).
> 
> I don't know if ddb is small enough for the memory (I only have 13kB
> free...)
> I'm not used to hack netbsd code, I found some interesting functions in
> msdosfs_vfsops.c, must I printf() both to see what's happening ?
> Here is a sample of interesting (I hope) parts:

I'd add a printf before each return(EINVAL). However, I'm not familiar
with the VFS code, so I may be leading you in the wrong direction... ;)

	-- Jachym