Updating USB stack from FBSD 8.x and others

[Alex Hornung]

> 2) BTX: i have been recently bitten by this thing again and I would really
> like to see GRUB + multiboot in, BTX and loader out.

About GRUB: if anyone wants to do it, then just do it. In my opinion
it's completely unnecessary and incovenient. If you would like to see
GRUB as our bootloader, just get it working and submit a patch.

Cheers,
Alex Hornung