xbox360 extension for review/debug

[Rene Ladan]

Hi,

I've written an extension to /sys/geom/geom_mbr.c to slice up xbox360
hard disks and memory units.  The patch for revision 1.68 (i.e. CURRENT)
is at http://home.tisali.nl/rladan/freebsd/geom_mbr.c.diff

Memory units are sliced up into two file systems, hard disks into three
(plus two non-filesystem slices).  This would normally be handled by the
 existing geom_mbr code, but Mircosoft didn't put a mbr / partition
table on the media :/

The code generates a new class XBOX360 which intends to detect and slice
up the media.  It is currently unusable, without an attached medium the
kernel panics during boot at xbox360_taste+0x82 in process g_up.  My
geom foo could use some help here :)  At least the 'geom' command in ddb
shows this new class (without consumers/producers).

(Microsoft also invented a new filesystem for the media, I'm currently
debugging a clone of msdosfs to parse this fileystem, see the -fs
archives of Nov/Dec 2006.)

Regards,
Rene
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