sio3 (COM4) problems on FreeBSD 4.8-RELEASE

[Jesse Guardiani]

Howdy list,

I'm having trouble with my sio3 (/dev/cuaa3) port on one
of my servers (with an SMP kernel). When I try to `tip com4`
to a cisco switch using this port, I get only partial data,
and this appears in the logs:

messages:Oct 10 17:18:37 billmax /kernel: sio3 at port 0x2e8-0x2ef irq 9 on isa0
messages:Oct 10 17:18:38 billmax /kernel: sio3: type 16550A
messages:Oct 10 17:20:16 billmax /kernel: sio3: 1 more silo overflow (total 1)
messages:Oct 10 17:20:18 billmax /kernel: sio3: 1 more silo overflow (total 2)
messages:Oct 10 17:20:21 billmax /kernel: sio3: 1 more silo overflow (total 3)
messages:Oct 10 17:20:22 billmax /kernel: sio3: 1 more silo overflow (total 4)
messages:Oct 10 17:20:23 billmax /kernel: sio3: 1 more silo overflow (total 5)
messages:Oct 10 17:20:27 billmax /kernel: sio3: 1 more silo overflow (total 6)
messages:Oct 10 17:20:36 billmax /kernel: sio3: 1 more silo overflow (total 7)
messages:Oct 10 17:20:38 billmax /kernel: sio3: 1 more silo overflow (total 8)
messages:Oct 10 17:20:45 billmax /kernel: sio3: 1 more silo overflow (total 9)
messages:Oct 10 17:20:48 billmax /kernel: sio3: 1 more silo overflow (total 10)
messages:Oct 10 17:21:04 billmax /kernel: sio3: 1 more silo overflow (total 11)
messages:Oct 10 17:22:15 billmax /kernel: sio3: 1 more silo overflow (total 12)
messages:Oct 10 17:40:07 billmax /kernel: sio3: 1 more silo overflow (total 13)
messages:Oct 10 17:46:29 billmax /kernel: sio3: 1 more silo overflow (total 14)


If I move the console cable from com4 to com1 on the server and keep the console
cable in the same switch, then `tip com1`, it works fine. It's just the sio3
port that I'm having trouble with. Note that this machine only has sio1 and sio3.

Here's my sio kernel config:

# Serial (COM) ports
device          sio0    at isa? port IO_COM1 flags 0x10 irq 4
device          sio1    at isa? port IO_COM2 irq 3
device          sio2    at isa? disable port IO_COM3 irq 5
device          sio3    at isa? port IO_COM4 flags 0x10 irq 9

Also, I've tried it with AND without the 0x10 flag (which I know just allows the
com device to be used as a serial console). AND I've tried it with the "do not use
FIFO" flag (0x00002) on COM4, like this:

# Serial (COM) ports
device          sio0    at isa? port IO_COM1 flags 0x10 irq 4
device          sio1    at isa? disable port IO_COM2 irq 3
device          sio2    at isa? disable port IO_COM3 irq 5
device          sio3    at isa? port IO_COM4 flags 0x00002 irq 9



I get the same error in the log either way. Port speed is set to 9600 in all tests.
I get the same problem under conserver, so it's not directly related to the `tip`
command, but the device.

Is there some magic voodoo flag that I need to pass to this port to get it working?

Thanks!

-- 
Jesse Guardiani, Systems Administrator
WingNET Internet Services,
P.O. Box 2605 // Cleveland, TN 37320-2605
423-559-LINK (v)  423-559-5145 (f)
http://www.wingnet.net