Serial Console problem

[Pavel Duda]

I've just tried connect to my fbsd box with serial cable (serial 
console), it works fine but I get always after some time this :

 > May 26 17:12:47 monty getty[585]: login_tty /dev/console: 
 >Inappropriate ioctl for device
 >May 26 17:12:47 monty getty[587]: login_tty /dev/console: 
Inappropriate >ioctl for device
 >May 26 17:12:47 monty init: getty repeating too quickly on port 
 >/dev/console, sleeping 30 secs
 >May 26 17:12:47 monty getty[589]: login_tty /dev/console: 
Inappropriate >ioctl for device

I can work with serial console, but these messages are anoying. Any 
suggestion how to get rid od them ?

Some info :
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System is FreeBSD 5.2.1
kernel with "options CONSPEED=115200"

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/etc/make.conf (bootblocks recompiled)
BOOT_COMCONSOLE_PORT=0x3F8
BOOT_COMCONSOLE_SPEED=115200"

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/etc/ttys
ttyd0   "/usr/libexec/getty std.115200" vt100 on secure

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dmesg
...
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A, console
...
--------------------------------------

	Thanks, P.D.