Date: Thu, 17 Jul 2008 13:12:42 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: freebsd-hackers@freebsd.org Subject: Re: serial console speed Message-ID: <E1KJQTa-000Bek-E8@cs1.cs.huji.ac.il> In-Reply-To: <20080703153329.GA58662@eos.sc1.parodius.com> References: <E1KEPtD-000CBH-SI@cs1.cs.huji.ac.il> <20080703153329.GA58662@eos.sc1.parodius.com>
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> On Thu, Jul 03, 2008 at 05:34:27PM +0300, Danny Braniss wrote: > > > On Thu, Jul 03, 2008 at 03:21:14PM +0300, Danny Braniss wrote: > > > > it seems that there is no way to change the speed/baudrate of the serial > > > > console, for example, by turning it off in /etc/ttys, and running > > > > tip(1) with different speeds has no effect, it always > > > > stays at the kernel configured speed. > > > > > > > > is this by design? > > > > > > Yes. > > > > why? > > > > to add some more 'issues', setting > > hint.sio.1.flags="0x10" > > does the redirection correctly but does not fix the speed to CONSPEED, and > > stays at 9600. (BTW, this used to work). > > The 9600 limitation is out-of-the-box. Despite what may seem logical, > in my experiences the console serial port speed on FreeBSD is "limited" > to a maximum of 9600bps unless you either use the -S flag in > /boot.config (e.g. -S115200), or loader.conf variables to adjust the > speed. > > Others will have to answer your remaining questions. > > > setting the serial speed means, > > compiling correctly btx, pxeboot, kernel, ilo. > > now it seems that any info in /boot.config or /boot/loader.conf is also > > ignored. > > This part is flat out incorrect. You no longer have to rebuild > anything, you can simply place -S115200 in /boot.config and it will > work. I know, because every single one of our production servers > (RELENG_6 through RELENG_7) use this. We **do not** rebuild boot > blocks. ok, need some explanation/rational: when booting via pxeboot, initialy, the BMX & libi386 have the serial port/speed hardcoded (for good reason), and as soon as posible it gets 'corrected' via the configuration files. things get complicated when the bios is uncooperative - e.g: Sunfire X2200/ilo. then, as if by magic, a bios upgrade solved most of the problems! - ofcource, the bios upgrade was triggered by another problem - why is PowerNow! not recognized :-( Oh, btw, you can change the serial speed of the console: sysctl machdep.conspeed=115200 which was the initial question :-). > > Please read this document for my findings. > > http://jdc.parodius.com/freebsd/pxeboot_serial_install.html > > -- > | Jeremy Chadwick jdc at parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, USA | > | Making life hard for others since 1977. PGP: 4BD6C0CB | >
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