Single user mode behaviour with serial console in 7.0RC2

Jeremy Chadwick koitsu at
Sat Feb 16 13:38:30 UTC 2008

On Sat, Feb 16, 2008 at 11:51:46PM +1100, Geoff Roberts wrote:
> Hi,
> I have built a FreeBSD 7.0RC2 system to use both the serial and video 
> consoles.
> I find that when I drop into single user mode (shutdown now) on the terminal 
> connected to the box itself I do not see the single user mode prompt on the 
> serial console terminal.
> Likewise, when I drop to single user mode on the serial console I do not see 
> the single user prompt on the terminal connected to the box itself.
> Is this expected, or have I configured something incorrectly?

FreeBSD does not support 100% dual-console configuration under all
stages of use; that is to say, single-user prompts will be output to
either VGA or serial console, but not both.

Some additional tips:

> In /etc/make.conf I have BOOT_COMCONSOLE_SPEED=115200

Not required if you use -S115200 in /boot.config.

> options         CONSPEED=115200

Not needed; see above.

> boot_multicon="YES"
> boot_serial="YES"
> comconsole_speed="115200"
> console="vidconsole,comconsole"

Not needed if -Dh is added to /boot.config (e.g. -S115200 -Dh).  Hope
this helps.

| Jeremy Chadwick                                    jdc at |
| Parodius Networking                  |
| UNIX Systems Administrator                      Mountain View, CA, USA |
| Making life hard for others since 1977.                  PGP: 4BD6C0CB |

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