Hi,

You might be able to do it if the kernel and rdisk image (boot-time
ramdisk) are on your internal drive.  Just set up your root and other
filesystems to be on the USB drive.  It will appear to be a SCSI disk,
as USB storage encapsulates SCSI CDBs in USB packets.

I boot Fedora this way on a PC whose BIOS doesn't support USB boots.
However, it took some work as the stock Fedora rdisk image didn't
include the drivers needed for USB storage.  I've been meaning for
eons to write a HOWTO about it, but haven't had the headspace for it
yet.  I'm afraid I don't remember much about it, as it was over a year
ago.

I also did this with a FireWire drive on an iBook.  yaboot, a PowerPC
Mac boot loader, can't load kernels from SBP-2 devices, so I put the
kernel and rdisk on the internal drive.

Hope this is enlightening,

Mike Crawford
mdcrawford at gmail dot com

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