On Thursday 21 March 2013, Lior Amsalem wrote:
> > From: Jason Gunthorpe [mailto:jguntho...@obsidianresearch.com]
> > Sent: Thursday, March 21, 2013 11:46 PM
> >
> > On Thu, Mar 21, 2013 at 11:35:21PM +0200, Lior Amsalem wrote:
> >
> > > > *) It would require Linux to change the internal registers address
> > > > (for now the kernel relies on the bootloader). The problem is that
> > > > we can't do it early enough to preserve the earlyprintk
> > > > functionality. Maybe you have suggestions on how to achieve that?
> > >
> > > Please note that all registers and IOs are still 32bit, the 40bit
> > > extension is on the CPU to DRAM path (windows) only.
> >
> > Ah, I did wonder, since Ezequiel's MBUS driver was the same as on prior
> > families. I guess it is also the case that all on board DMA and DMA from
> > PCI-E
> > devices are restricted to the low 32 bits as well?
>
> Correct, that's why we sets DMABOUNCE config.
>
IIRC, DMABOUNCE does not work well in a multiplatform configuration. Have you
tried
using swiotlb instead?
Arnd
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