Re: Address of second TMSCP controller

[Anders Magnusson <ragge%tethuvudet.se@localhost>]

Den 2021-01-26 kl. 16:05, skrev Paul Koning:
> > On Jan 26, 2021, at 7:57 AM, Mouse <mouse%Rodents-Montreal.ORG@localhost> wrote:
> >
> > > In addition to a broken TK70, which is being recognised fine by
> > > NetBSD as mt0, I want to use a 40/80GB DLT on a Dilog SQ703 SCSI
> > > TMSCP adapter.
> > > NetBSD doesn't recognise it on booting.=C2=A0 I don't see anything
> > > about addressing in the hardware wiki, does anybody know the address
> > > where NetBSD looks for a second controller?
> > As far as I can tell, it doesn't.  The only TMSCP device I see is
> >
> > mtc*		at uba? csr 0174500	# Tape MSCP ctlr
> >
> > Since there's no other mtc in sight, I rather wonder why it's mtc*
> > rather than mtc0 - perhaps for machines with multiple buses?
> >
> > I imagine you could add a second mtc line to your config at whatever
> > address you put your Dilog card at.  ISTR that DEC had a bunch of rules
> > for such addresses - the phrase "floating CSR space" comes to mind -
> Right.  In the DEC rules, this is a "first unit fixed, rest float"
> device, just like the MSCP disk controllers.  The float CSR rank is 30.
> Does NetBSD do the floating CSR address algorithm?  If not, yes, just
> pick some address and tell the OS what it is.
No, NetBSD do obey the floating CSR spec.
This code is actually from 4BSD which didn't either.

-- R