Date: Sun, 22 Dec 2002 20:09:21 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: marcel@xcllnt.net Cc: perforce@freebsd.org Subject: Re: PERFORCE change 22623 for review Message-ID: <20021222.200921.66023382.imp@bsdimp.com> In-Reply-To: <20021222231958.GA1414@athlon.pn.xcllnt.net> References: <200212221912.gBMJCf5i009504@repoman.freebsd.org> <20021222.150927.83284721.imp@bsdimp.com> <20021222231958.GA1414@athlon.pn.xcllnt.net>
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In message: <20021222231958.GA1414@athlon.pn.xcllnt.net>
Marcel Moolenaar <marcel@xcllnt.net> writes:
: On Sun, Dec 22, 2002 at 03:09:27PM -0700, M. Warner Losh wrote:
: > In message: <200212221912.gBMJCf5i009504@repoman.freebsd.org>
: > Marcel Moolenaar <marcel@freebsd.org> writes:
: > : Convert to the new sioprobe/sioattach interface. While here,
: > : remove the sio_pci_unit_kludge function. We consider this the
: > : "future" version which according to the comment makes it
: > : obsolete :-)
: >
: > It is not obsolete. There's no way to say that the ISA serial ports
: > have reserved sio0 and sio1 so that the pci serial port should attach
: > to sio2 or sio4. Until there is, this kludge is needed.
:
: Can you tell me why or when this would be useful?
Yes.
Consider that we probe sio on isa after sio on pci. When probing sio
on pci, we get sio0 because the sio on isa stuff hasn't happened yet.
So, pci steal sio0 and the sio on the isa bus get sio1 and sio2. When
using a serial console, this can cause problems with the console code
because sio0 is flagged as the conosle, but sio1 is attached and there
were (are?) problems in the console code that caused a panic if you
ran in this combo. If that's no longer the case, then we have the
'usual' disconnect between the hints and the actual instances.
I just remeber when I did it that it was a big deal to me and to the
folks that hired me to create a pci driver for the controller based
modems. Maybe things have changed, and if so I'm cool with things
going away. But if they haven't changed, this needs to stay around
until the underlying problems are fixed.
Warner
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