Date: Sun, 14 Nov 2004 11:38:50 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Danny Braniss <danny@cs.huji.ac.il> Cc: freebsd-hackers@freebsd.org Subject: Re: boot serial console speed Message-ID: <20041114093850.GE84553@ip.net.ua> In-Reply-To: <20041114083914.B43BC43D1D@mx1.FreeBSD.org> References: <20041114083914.B43BC43D1D@mx1.FreeBSD.org>
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[-- Attachment #1 --] On Sun, Nov 14, 2004 at 10:39:13AM +0200, Danny Braniss wrote: > what's the magic encantation to set the console to 38400? > btw, i solved my problem by just commenting out that part of the code, > since i rely on the bios setting it. > > from src/sys/boot/i386/boot0/Makefile: > > # Comm settings for boot0sio. 0xE3 => 9600 8-N-1 > # XXX: We should create a build-tool or something to convert BOOT_CONSOLE_SPEED > # and BOOT_COMCONSOLE_PORT into the correct values to define on the build > # command line > BOOT_BOOT0_COMCONSOLE_SPEED?= 0xE3 > This is the value passed in the AL register to the Int 14/AH=00h BIOS function: http://www.ctyme.com/intr/rb-0811.htm : Bit(s) Description (Table 00300) : 7-5 data rate (110,150,300,600,1200,2400,4800,9600 bps) : 4-3 parity (00 or 10 = none, 01 = odd, 11 = even) : 2 stop bits (set = 2, clear = 1) : 1-0 data bits (00 = 5, 01 = 6, 10 = 7, 11 = 8) 0xE3 = 111-00-0-11 = 9600 bps, no parity, 1 stop bit, 8 data bits But I think it's not possible to set it to anything above 9600 bps using this BIOS call. Cheers, -- Ruslan Ermilov ru@FreeBSD.org FreeBSD committer [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFBlyeqqRfpzJluFF4RArjoAJ490PgNAB3bIyyejQxvoFW17p48dACgk324 K2RyTh38nRnNiQBEi2OyApk= =oNQR -----END PGP SIGNATURE-----
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