serial console on macbook?

[Ben Calvert]

can't install 4.0 or snapshots on my macbook due to what appear to be  
issues with the usb controller.  ( lots of errors about the usb  
controller, and the keyboard is nonresponsive... no capslock light,  
no input )

does anyone have any ideas about how to capture the dmesg so i can  
submit?

thanks,

ben