Is it possible to boot an Intel Mac to Linux, or any non-OS X operating system, from the U3 partition of a USB drive?
I know that because OS X uses EFI rather than BIOS for the boot process, the only way to boot from USB is generally if you're booting an EFI-capable operating system -- meaning OS X. And (at least I think) I know that when a non-OS X operating system is booted, a Mac switches into BIOS emulation mode during the boot process, which actually disables USB support until the OS loads the appropriate drivers for the USB subsystem... which is why booting non-OS X operating systems is generally not possible from USB drives.
So this got me to thinking -- since you can boot any OS on a Mac from CDROM, and there are USB-based CDROM drives that one can boot from, what if a USB device emulated a CDROM? And that led me down the rabbit hole to the (now-extant) U3 spec from SanDisk, which did just that -- emulated a full CDROM on a partition of a USB drive.
So, is it possible to boot from this partition, and boot into a non-OS X operating system?