Is here way to have 9600+ serial console and see boot0 message?

[Gary Jennejohn]

On Thu, 6 Sep 2018 18:30:12 +0300
Lev Serebryakov <lev at FreeBSD.org> wrote:

> On 05.09.2018 21:12, Jung-uk Kim wrote:
> 
> > Put this line in /etc/make.conf.
> > 
> > BOOT_BOOT0_COMCONSOLE_SPEED=0
> > 
> > Then, boot0sio will not change serial port configuration.  
> 
>  I've tried this, and it doesn't help. Maybe, BIOS reset settings before
> calling boot code.
> 

The answer is in the Makefile.  All possible supported baud rates
are checked there.  If the value set in
BOOT_BOOT0_COMCONSOLE_SPEED does not match one of the
pre-defined values, it defaults to 9600 baud.  Since 0 is not a
valid baudrate, 9600 is used.

-- 
Gary Jennejohn