Date: Wed, 25 Oct 2006 10:57:20 +0200 From: Stefan Bethke <stb@lassitu.de> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: Vivek Khera <vivek@khera.org>, FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: kernel ignores kenv comconsole_speed? Message-ID: <C4C11B67-B5C1-4602-B49F-CABDA3C8AFF9@lassitu.de> In-Reply-To: <20061024144134.GA72596@icarus.home.lan> References: <F8963480-4EE2-4C0C-B209-52BE0862740A@lassitu.de> <6196E612-1611-4D81-BF50-8E54DED00480@khera.org> <911B338C-38E0-4952-986C-F9DBC82E99BE@lassitu.de> <B138713A-D962-4B35-95A2-6727A944431D@khera.org> <20061024144134.GA72596@icarus.home.lan>
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Am 24.10.2006 um 16:41 schrieb Jeremy Chadwick:
> On Tue, Oct 24, 2006 at 09:41:57AM -0400, Vivek Khera wrote:
>>> Am 23.10.2006 um 17:46 schrieb Vivek Khera:
>>>> On Oct 20, 2006, at 6:59 AM, Stefan Bethke wrote:
>>> As I said, boot and loader are happily using 115200, but the kernel
>>> uses the compiled-in default. I'll file a PR the next few days,
>>> hopefully with a patch.
>>
>> As I said, "works for me". I wonder what it is you are going to
>> patch? Did you try it with the separate -S option? Did it work?
>
> I think what Stefan refers to is the complex nature of how the
> serial port is initialised/"tinkered with" in stages.
[ Very good, but very long explanation of the various users of the
serial port omitted ]
> What I'd like to propose is similar to Stefan's recommendation:
> is there any way possible to:
>
> * Not touch the serial port AT ALL, EVER [...]
I'm not sure that would be so easy. However, CONSPEED is/was the
setting to be used if the actual setting cannot be determined when
sio initializes. I haven't researched if there ever was code that
tried to determine the sio settings when (re-)initializing. However,
sioreg.h says:
/* default serial console speed if not set with sysctl or probed
from boot */
#ifndef CONSPEED
#define CONSPEED 9600
#endif
For me, probing from boot could just mean to initialize the speed
from kenv comconsole_speed if set, and fall back to CONSPEED
otherwise. I'll try to get around that on the weekend.
In current, imp re-enabled the commented-out tunable for
machdep.conspeed. Re-enabling that works without a problem, it seems
(cf. 1.463 of sio.c).
Stefan
--
Stefan Bethke <stb@lassitu.de> Fon +49 170 346 0140
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