KT7-RAID, Booting from USB 2.0 add-on card possible?

Hi

I am interested to know if it will be possible to boot from a harddrive connected to an USB 2.0 PCI add-on card?

I would guess that if i select "USB" as first bootdevice in bios, then it will only look at the onboard usb ports, not the add-on card in the PCI slot.

Any way to get it to boot from the USB ports on the add-on card?
(wich is much faster than the onboard USB ports)