how to use a pcmcia as a boot device

Basically everything is in the instructions of this nice bootloader: 

http://www.plop.at/en/bootmanager.html

The boot manager can act as USB PC-Card enabler and the boot manager makes it possible to boot from the USB PC-Card. When your laptop has only USB 1.1, then you can speed up the boot process with an USB 2.0 PC-Card. When your laptop has only one USB port, then you are able to get more USB ports with an USB PC-Card.

You find the boot manager with the CardBus driver in the pcmcia directory of plpbt-5.0.12.zip.

ciao alex