On Mon, Apr 10, 2006 at 09:46:30AM -0400, John W. Linville wrote:
> On Mon, Apr 10, 2006 at 06:28:00AM +0200, Michael Buesch wrote:
>
> > To summerize: I actually added these messages, because people were
> > hitting "this does not work with >1G" issues and did not get an error message.
> > So I decided to insert warnings until the issue is fixed inside the arch code.
> > I will remove them once the issue is fixed.
>
> This sounds like the same sort of problems w/ the b44 driver.
> I surmise that both use the same (broken) DMA engine from Broadcom.
>
> Unfortunately, I don't know of any good solution to this. There are
> a few hacks in b44 that deal with the issue. I don't like them,
> although I am the perpetrator of at least one of them. It might be
> worth looking at what was done there?
The hacks i see there is reallocating a buffer with GFP_DMA, so that
means that if the ppc dma_alloc_coherent did the same thing as the i386
counterpart (adding GFP_DMA if dma_mask is less than 32bits) it should
work, no ?
regards,
Benoit
ps: i do not have the hardware so i sadly cannot test.
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