Date: Sat, 2 Sep 1995 22:39:20 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: deischen@iworks.InterWorks.org (Daniel M. Eischen) Cc: FreeBSD-current@FreeBSD.Org (FreeBSD current) Subject: Re: Getting around conflicts for a driver w/out base address Message-ID: <199509030539.WAA16270@gndrsh.aac.dev.com> In-Reply-To: <9509030255.AA25934@iworks.InterWorks.org> from "Daniel M. Eischen" at Sep 2, 95 09:55:00 pm
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>
> >Hum, yea, I think config(8) is doing the wrong thing with null ``port''
> >specifications. What does the ../../compile/KERNEL/ioconf.c file look
> >like? [Just the applicable mib0, lpt and ahc lines.]
>
> I'll have to wait until Tuesday, but the ahc and lpt stuff should be just
> the same as configured with a generic kernel - I made no changes to their
> configuration.
>
> { 3, &ahcdriver, 0x0000, 0, -1, C 0x00000, 0, ahcintr, 1, 0x0000, 0, 0, 0, 0, 1, 0, 0 },
>
> { 12, &lptdriver, 0xffffffff, IRQ7, -1, C 0x00000, 0, lptintr, 0, 0x0000, 0, 0, 0, 0, 1, 0, 0 },
> { 13, &lptdriver, 0xffffffff, 0, -1, C 0x00000, 0, NULL, 1, 0x0000, 0, 0, 0, 0, 1, 0, 0 },
> { 14, &lptdriver, 0xffffffff, 0, -1, C 0x00000, 0, NULL, 2, 0x0000, 0, 0, 0, 0, 1, 0, 0 },
>
Hummm... looks as if config emits 0x0000 for the port address when you
have none specified. That is arguably incorrect since address 0x0000 is
a valid I/O port address. [And when I wrote the conflict code I was
well aware that it was a valid address, but I was not aware that was
what config emitted for no specified address :-(].
It looks like config is specifically hacked to emit -1 for port?, which
is also arguable incorrect as 0xffffffff is a valid port address internal
to the pentium CPU (it will not drive this to the external bus but there
are some very special undocumented things in the very high 32 bit port
address ranges [Don't ask NDA's prevent discussion beyond what I have
already stated]).
It looks to me as if the isa_device struct needs another qualifying field
for iobase that says it is either wildcarded (port?), unspecified (no port
spec at all) or given (port 0xf0f).
> The mib driver (MIL-STD-1553B) and board are installed on a machine at
> work and one
> of those darn firewalls prevents me from getting in from home :(.
You mean to tell me the 1553B bus is still alive? I spent 5 years with
Rolm Mil-spec computers and use to be around a lot of 1553B based equipment.
> Thanks for replying and cc'ing to -current :)
No problem, though the thread really should stay on -current, and this
reply should have been to current :-(. So I am going to stuff it back
onto -current.
--
Rod Grimes rgrimes@gndrsh.aac.dev.com
Accurate Automation Company Reliable computers for FreeBSD
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