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USB support

I've been working on d-i usb support today. Current status is that it
works (boots) here, and it will work in the archive once we get a new
busybox and kernel-modules. 

I have only tested booting from a floppy, as none of the 6 or 10
computers I have tried can boot direct from a non-floppy usb device[1].
So the d-i bootfloppy can be used to boot such systems, and it will then
load the main d-i initrd from USB media (either USB floppy, or keychain).

For the d-i initrd, I am currently using the "floppy" image on my USB
keychain, dd'd to the front[2], but that is less than ideal. Ideally we
would have something much like the debian CD images, but that can be
thrown onto a USB keychain, and used for a debian base install direct
from the keychain. 

I'm considering adding enough USB stuff to the cdrom image that it can
find itself on USB, and then the netinst CD images would work well on a
smaller keychain, and a CD image with the base debs as well would work
ok on a larger keychain. There may be too much CDROM-specific stuff on
the cd image for this to be feasable, not sure yet.

Another eventual problem is that the bootfloppy currently refuses to
mount images that have a linux kernel on them. It assumes that any such
image is the boot image from the bootfloppy itself. Once someone manages
to direct boot a usb keychain, they will want a kernel on it, and this
will make it unusable with the bootfloppy. Before that happens I need to
find a better way for the bootfloppy to detect itself. I may use a
special DOS disklabel for that floppy or something like that.

see shy jo

[1] Or it could be that the one USB keychain I have tried to boot all
    those systems with just doesn't support USB boots that well.
[2] It also supports putting it in any partition of the keychain, if the
    thing is partitioned.

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