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

[Ruslan Ermilov]

On Fri, Sep 01, 2006 at 11:07:05AM -0400, John Baldwin wrote:
> 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.
> 
Please don't.


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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