Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver

[Uwe Kleine-König]

Hello,

Magnus Damm wrote:
> On Wed, May 21, 2008 at 5:05 PM, Uwe Kleine-König
> <Uwe.Kleine-Koenig@xxxxxxxx> wrote:
> > @Magnus: Maybe you can provide the userspace part of the driver?
> > How is that mapping used there?
> 
> [Added Matsubara-san as CC]
> 
> Sure, here is a little test program. Have a look at "uio_mem". The
> "address" member contains the physical address that can be used for
> bus mastering DMA. Compare that to "iomem" which is the pointer to the
> virtual memory area in user space.
> 
> Hope this helps!
Yes it does.  I thought the physical address is stored in internal_addr
and the virtual in addr, but it's the other way round.  Thanks.

Best regards
Uwe

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Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
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