kern/111958: sio0: port may not be enabled

Stefan Lambrev stefa.lambrev at
Fri Apr 20 16:30:04 UTC 2007

>Number:         111958
>Category:       kern
>Synopsis:       sio0: port may not be enabled
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Apr 20 16:30:03 GMT 2007
>Originator:     Stefan Lambrev
>Release:        FreeBSD 6.2-STABLE
FreeBSD 6.2-STABLE FreeBSD 6.2-STABLE #4: Mon Mar 12 16:39:25 EET 2007     root at  amd64
Serial port does not work :

from dmesg:
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A

I thought it can be a problem because of shared IRQs .. but vmstat -i shows this:

% vmstat -i
interrupt                          total       rate
irq4: sio0                             7          0
irq15: ata1                           69          0
irq20: atapci0                      3783         15
irq21: uhci0 uhci*                     2          0
cpu0: timer                       491698       1990
Total                             495559       2006

from /boot/device.hints :"isa"

I checked my BIOS - both irq 3&4 are reserved for ISA,
and com port 1 is setup to use irq4 port 3F8. 
Install freebsd on HP compaq nw8440, or Asus A8N motherboard.


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