serial console speed
koitsu at FreeBSD.org
Thu Jul 3 15:33:29 UTC 2008
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.
> to add some more 'issues', setting
> 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
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
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
Please read this document for my findings.
| 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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