cvs commit: www/en/projects/busdma index.sgml
Ruslan Ermilov
ru at FreeBSD.org
Fri Sep 1 16:07:46 UTC 2006
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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