> Reads are now working (a RZ23L gets about 730KB/s).  
> Writes seems to never complete.
> 
Wow, congrats!

> I had to add a vmapbuf/vunmapbuf routines but hopefully
> they won't effect the other disk drivers too much.
>
Actually they do... Removing them gave ~200k/s extra speed while
doing raw disk I/O on a VS3100/m30. Also adding them may break the
raw disk DMA on the NCR5380.
It would be nice if they could be avoided. There is actually no reason
to use those routines at all on a vax; the only situation they are 
needed are on archs where a) all data must be copied and b) the whole
memory isn't accessible directly. On those archs it could be solved in
a different way anyway nowadays.

-- Ragge