Re: [PATCH] fsldma: use PCI Read Multiple command

Scott Wood
2009-04-27T20:48:20Z

On Mon, Apr 27, 2009 at 03:04:49PM -0500, Timur Tabi wrote:
> David Hawkins wrote:
>
> > Can you give me an example of non-PCI memory that would be
> > non-prefetchable that you'd like us to try? We can see if our
> > host CPUs have an area like that ... we just need to know
> > what device to look for first :)
>
> Hmmmm.... I was going to say any SOC device in the IMMR, but I don't see
> anything there that would constitute a memory buffer.
>
> I test this change on an 8610 and DMA to a register I/O, where this bit
> isn't even defined, and it made no difference. So I guess this change
> is okay.

I thought the driver only used the bit if the device tree indicated it
was an 83xx-era DMA controller?

That said, the bits are documented as specifically for PCI, so it would
be surprising if it had any effect elsewhere.

-Scott