Date: Tue, 2 Sep 2003 10:14:51 +1000 From: John Birrell <jb@cimlogic.com.au> To: Scott Long <scottl@freebsd.org> Cc: "Scott M. Likens" <damm@fpsn.net> Subject: Re: Question related to FreeBSD Serial Console... Message-ID: <20030902101451.F1311@freebsd1.cimlogic.com.au> In-Reply-To: <3F53D645.2040501@freebsd.org>; from scottl@freebsd.org on Mon, Sep 01, 2003 at 05:29:09PM -0600 References: <1062445674.59251.1.camel@acheron.livid.de> <3F53CF00.6020304@freebsd.org> <20030901232227.5F1D23A4C3@www.fastmail.fm> <3F53D645.2040501@freebsd.org>
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On Mon, Sep 01, 2003 at 05:29:09PM -0600, Scott Long wrote: > At one time I was working on patches to the loader to make the console > speed configurable. At the time, at least, I didn't see any evidence > that the settings were stored in the boot0 block, but maybe I was wrong. AFAIK, the boot0 block uses bios int 0x16 to get a key-press and bios int 0x10 to display a character, so in a situation where you *want* a serial console, the F1 etc stuff can't be used unless the bios supports console re-direction. And you have to live with whatever baud rate the bios sets. Once you get to boot2, then the serial console can work if set in /boot.config. It would be nice to have a boot.config setting for the baud rate. I have a board here that allows bios re-direction to either the first or second serial port at a fixed baud rate of 38400. I have to build boot2 with BOOT_COMCONSOLE_SPEED=38400, and then the kernel with CONSPEED=38400 to get all the ducks in a row. But it would be even nicer if both boot2 and the kernel would just work with whatever baud rate the bios set. -- John Birrell
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