Bootable CompactFlash Cards For Handhelds?

An Anonymous Coward asks: "Why haven't Compaq, HP and others provide an option in BIOS to boot from from a Compact Flash card in order to speed Linux acceptance and development for handhelds like the IPAQ 3600 series? Are there technical reasons? I some of you have to be drooling over the possibility of Linux on these babies - and yes I know about the great work at handhelds.org - but a worrisome thing is that currently, once you burn flash in the unit, there is no going back. If these companies would provide that option, the development of alternative OS's to winCE would speed up! Want to try a new kernel? Replace the CompactFlash card."