USB vs PAE

[M. Warner Losh]

In message: <F007A7E8-39A5-4553-A439-10FD3EA3E0E3 at gid.co.uk>
            Bob Bishop <rb at gid.co.uk> writes:
: Hi,
: 
: On 23 Oct 2007, at 20:45, Ivan Voras wrote:
: 
: > Bob Bishop wrote:
: >> Hi,
: >>
: >> The whole USB kit and caboodle is nodevice'd out in the PAE  
: >> config. Can
: >> anyone give a succinct summary of what needs fixing? (EVERYTHING!  
: >> is an
: >> acceptable answer) Thanks
: >
: > I'm running USB keyboard and mouse under PAE without problems. Don't
: > know about other USB devices. AFAIK everything that is 64-bit clean
: > (i.e. works on AMD64 and other architectures) should work ok with PAE,
: > so try compiling it in and see for yourself.
: 
: 
: Yes. Keyboard and umass (CDROM and memory stick) seem to work here on  
: 6.2R. Thanks!

In 6.x the big problem is busdma support.  USB doesn't use it quite
right, which means that buffers that it uses must be in the lower
4GB.  If not, then it won't work.

Current does proper scatter/gather, so should work without issue.

Warner