Under NetBSD 2.0.2 (mid June source) I've seen these messages while 
booting the CS20 when it
is connected to the fibrechannel array (an EMC/Dell 660FC).

The message repeats and the machine never gets past that point (it must 
be power cycled).

I've also seen this message when bring up the array after the machine 
has booted:

isp0: Interrupting Mailbox Command (0x6a) Timeout
isp0: Mailbox Command 'GET PORT NAME' failed (TIMEOUT)

The device:

isp0 at pci0 dev 5 function 0: QLogic FC-AL and Fabric HBA
isp0: interrupting at dec 6600 irq 24

isp0: I/O while blocked
isp0: I/O while blocked
isp0: I/O while blocked
isp0: I/O while blocked
isp0: I/O while blocked

Is it possible that there is a configuration setting on the 660FC to 
help with this issue?