silo overflows -- what can I do about this?

[Joseph Garcia]

Okay, so I was working via the console port (i.e. DFly box connected to 
 Firewall via serial port) of my PIX firewall and I kept getting these 
errors. These errors made it quite impossible to configure the firewall 
because I was unable to recieve the output from the PIX device.

Error Messages (/var/log/messages):
Oct 17 17:40:04 dfly kernel: sio1: 2 more silo overflows (total 23)
Oct 17 17:40:06 dfly kernel: sio1: 4 more silo overflows (total 27)
Oct 17 17:41:22 dfly kernel: sio1: 7 more silo overflows (total 34)
Oct 17 17:41:24 dfly kernel: sio1: 9 more silo overflows (total 43)
Oct 17 17:41:25 dfly kernel: sio1: 4 more silo overflows (total 47)
Oct 17 17:41:38 dfly kernel: sio1: 2 more silo overflows (total 49)
Oct 17 17:49:36 dfly kernel: sio1: 1 more silo overflow (total 50)
Oct 17 17:49:53 dfly kernel: sio1: 1 more silo overflow (total 51)
Oct 17 17:49:57 dfly kernel: sio1: 1 more silo overflow (total 52)
Oct 17 17:50:02 dfly kernel: sio1: 1 more silo overflow (total 53)
Is there anything I can do about these errors? The man page for sio says 
that it's an interupt problem. Any help would be appreciated.

Thanks!

Joey