Serial console only works after reboot?

[Doug White]

On Sun, 4 Jan 2004, Nate Lawson wrote:

> On Sun, 4 Jan 2004, M. Warner Losh wrote:
> > In message: <20040103233044.N17367 at root.org>
> >             Nate Lawson <nate at root.org> writes:
> > : On Sat, 3 Jan 2004, M. Warner Losh wrote:
> > : > In message: <20040103184934.V16815 at root.org>
> > : >             Nate Lawson <nate at root.org> writes:
> > : > : I have a laptop (IBM T23) and use sio0 as my console/gdb port.  One thing
> > : > : I noticed is if I power up the laptop and boot -h, I get garbage out the
> > : > : serial port.  However, if I boot fully and then just warm reboot, the
> > : > : serial console works fine.  I'm only using 9600 bps.  Ideas?
> > : >
> > : > weird.  Is the garbage data at some different rate?
> > :
> > : Nope, checked everything from 1200 up to 38400, different garbage but
> > : always garbage.  This is with -current as of 2003/12/30, no patches.
> >
> > Try 115200.
>
> That works.  Now the question is "why".  Note that I have no "options
> CONSPEED" so according to /sys/dev/sio/sioreg.h, it should default to 9600
> and indeed does, after a reboot.  But not on a cold startup.

Are you setting BOOT_COMCONSOLE_SPEED anywhere?  That also impacts the
serial console speed setting.



-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org