7.2-p4 serial console not showing kernel messages?

Lowell Gilbert freebsd-questions-local at be-well.ilk.org
Mon Nov 9 16:52:33 UTC 2009

Sven Hazejager <sven at hazejager.nl> writes:

> I'm having trouble getting 7.2-p4 to run. I'm using nanoBSD, either
> under VMware using a virtual serial null-modem or on an Alix
> Soekris-like serial-only CF-based device, both show this problem: my
> serial console does not display kernel messages, they all go to the
> VGA console!
> I'm using the nanoBSD cust_comsole function to enable the console.
> Relevant files are shown here:
> /boot.config:
> -h -S57600
> /etc/ttys, only one line is "on":
> ttyd0   "/usr/libexec/getty std.57600"  xterm   on secure
> These are still in my kernel conf, if I remove these I get no kernel
> messages at all (kernel boots fine with this though):
> device          atkbdc          # AT keyboard controller
> device          atkbd           # AT keyboard
> device          kbdmux          # keyboard multiplexer
> device          vga             # VGA video card driver
> I have also tried to set this in the loader, no luck:
> hint.sio.0.flags="0x30"
> On the serial console, I see the boot manager (boot0) and the loader
> just fine. "show" in the loader says "console=comconsole" so that
> seems to be fine. However all kernel output goes to the VGA console. I
> *do* get a login prompt after a while on the serial console though.
> If I boot the same kernel over PXE on the ALIX, the kernel messages
> *do* go to the serial console...
> What am I overlooking?

Checking the obvious: syslog.conf is configured to send the messages to
the console?

Lowell Gilbert, embedded/networking software engineer, Boston area

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