kern/41241: vesabios prevents serial console from working

[hramrach%centrum.cz@localhost]

>Number:         41241
>Category:       kern
>Synopsis:       vesabios prevents serial console from working
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 17 19:50:00 +0000 2009
>Originator:     Michal Suchanek
>Release:        5.0 RC3
>Organization:
>Environment:
NetBSD  5.0_RC3 NetBSD 5.0_RC3 (Dell_CPxJ) #0: Tue Apr 14 10:54:55 CEST 2009  
root@:/usr/src/sys/arch/i386/compile/Dell6
>Description:
Adding consdev=com0 to boot.cfg normally causes boot messages and getty to show 
on the serial port.

When vesabios is configured in the kernel the kernel messages end as soon as 
the vesabios is initialized and no getty is listening on the serial port.
>How-To-Repeat:
enable vesabios in the kernel:

# VESA framebuffer console
options         KVM86                   # required for vesabios
vesabios*       at vesabiosbus?
vesafb*         at vesabios?
options         VESAFB_WIDTH=1024
options         VESAFB_HEIGHT=768
options         VESAFB_DEPTH=8
#options        VESAFB_PM               # power management support
wsdisplay*      at vesafb? console ?

>Fix: