New USB stack - some updates

[M. Warner Losh]

In message: <200709040810.48776.hselasky at c2i.net>
            Hans Petter Selasky <hselasky at c2i.net> writes:
: Hi,
: 
: There hasn't been some many changes during the last month to my SVN repository 
: nor P4 tree. Actually that is because my cable provider in Norway has been 
: terribly slow providing me decent internet access. So there will be a big 
: commit soon with lots of improvements.

Connectivity problems suck :-(


: Anyways, there are several changes coming soon, some of which might interest 
: you:
: 
: 1) Optimisations for embedded platforms
: 1.a) Reduced stack usage
: 1.b) Faster USB control transfers
: 1.c) Loading of DMA buffers with automatic cache synch operations.

Cool!  Which embedded platforms were targeted?  All but the last one
are useful on i386, so I assume thing else?

: 2) End of data bouncing in USB drivers. Using DMA buffers are now mandatory.
: 
: 3) Some non-critical bug fixes.
: 
: 4) Planned "USB device side" support. Currently only the "USB host side" is 
: well supported.

This sounds very interesting.  Do you have a design that you can share
at this time?

: PS: I will be at EuroBSDcon in Denmark next week, available for comments.

Sadly, I'll not be able to make it to EuroBSDcon, as much as I wanted
to go.  Too many work obligations.

Warner