Date: Wed, 2 Aug 2006 21:50:26 GMT From: Jo Rhett <jrhett@svcolo.com> To: freebsd-i386@FreeBSD.org Subject: Re: i386/100831: sio ignores BIOS information about serial ports - bounty offered Message-ID: <200608022150.k72LoQtn098666@freefall.freebsd.org>
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The following reply was made to PR i386/100831; it has been noted by GNATS.
From: Jo Rhett <jrhett@svcolo.com>
To: Bruce Evans <bde@zeta.org.au>
Cc: freebsd-gnats-submit@freebsd.org, freebsd-i386@freebsd.org,
njl@freebsd.org
Subject: Re: i386/100831: sio ignores BIOS information about serial ports - bounty offered
Date: Wed, 2 Aug 2006 14:47:01 -0700
> >4. There should be no ill effect from doing this. Console will never break
> >and go to the wrong port.
> >
> >#4 is crucial to us. Many of these machines are completely unavailable to
> >me for an emergency. This console is our "last chance access"
On Thu, Aug 03, 2006 at 03:25:28AM +1000, Bruce Evans wrote:
> Yes, "should be". The wiring should be fairly deterministic once you
> get it to work. I think it will continue to work even if someone fixes
> (?) ACPI to prefer the hints order to the ACPI order. However, it would
> break if someone fixes (?) ACPI to prefer the BIOS order to both the hints
> order and the ACPI order (I think ACPI is using its own order and doesn't
> know that you've swapped the order in the BIOS).
Actually, it doesn't work right now. I just tested it.
/boot/device.hints: hint.sio.1.flags="0x90"
If you change the flags in device hints, the low-level (boot loader 2?)
console gets moved to wherever you put the flags.
So now I have the exact reverse behavior. The initialization part of the
console goes to the wrong port, and then halfway through booting I
suddently get console on the right port.
I think I have to agree with Marcel on this -- device hints aren't used
consistently, and having two different processes read it with two
completely different interpretations of it is nonsense. I can't fix one
without breaking the other.
--
Jo Rhett
senior geek
SVcolo : Silicon Valley Colocation
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