cvs commit: www/en/projects/busdma index.sgml

[John Baldwin]

On Friday 01 September 2006 10:41, Scott Long wrote:
> Joel Dahl wrote:
> 
> > joel        2006-09-01 09:17:38 UTC
> > 
> >   FreeBSD doc repository
> > 
> >   Modified files:
> >     en/projects/busdma   index.sgml 
> >   Log:
> >   -  Add a bunch of missing USB network drivers: aue(4), axe(4), cdce(4),
> >      cue(4), kue(4), rue(4) and udav(4).  Mark everything as unknown for 
now.
> >   -  Fix minor nits.
> >   
> >   Revision  Changes    Path
> >   1.147     +87 -10    www/en/projects/busdma/index.sgml
> 
> The DMA capability of a USB peripheral is a function of the USB stack 
> and controller, not the peripheral driver.  Unlike a PCI card, a USB
> periph does not have access to host memory.  All of the real magic seems
> to happen in places like usbd_setup_xfer(), which again is a function of
> the stack, not the periph driver.  These drivers don't belong on this
> list at all, and I'd argue that no USB periph drivers do.

The only reason they might is that this list has become a list not just of 
bus-dma conformance, but locking as well (i.e. a general driver 
feature/requirement list), so while the DMA-related entries should probably 
be N/A for the USB devices, the locking fields are still relevant.  We could 
move the list of drivers to a separate driver-features list page if you would 
prefer.

-- 
John Baldwin