On Tue, 8 Jul 1997 09:57:05 +0100 (BST) 
 "J.D.Coleman" <J.D.Coleman@newcastle.ac.uk> wrote:

 > 	mt: /dev/nrst0: Input/output error

 > I had a quick look at st.c but I'm not sure why it (stopen presumably)
 > returns ENXIO.  Is there something I should add to the quirks list?

ENXIO is "device not configured".  EIO is input/output error.  Try looking
for EIO.

Dunno about the GDB problem, sorry..

Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                               Home: 408.866.1912
NAS: M/S 258-6                                          Work: 415.604.0935
Moffett Field, CA 94035                                Pager: 415.428.6939