Any way to get a USB-Serial adapter to work at boot time for console redirection?

[Thomas Cameron]

All -

I have a USB to serial adapter that works great as /dev/ttyUSB0 after my 
FC5 system is up and running.  I need it to work at boot time via 
grub.conf.  I tried adding console=ttyUSB0,9600 to the kernel line of 
grub.conf but it does not work.

Anyone know how to get this device to work at boot time?

Thanks!