On Thu, May 22, 2014 at 10:35 PM, Arnd Bergmann [off-list ref] wrote:

On Thursday 22 May 2014 20:52:38 Linus Walleij wrote:

quoted

On Thu, May 22, 2014 at 5:49 PM, Arnd Bergmann [off-list ref] wrote:

quoted

On Thursday 22 May 2014 15:45:03 Catalin Marinas wrote:

quoted

quoted

Anyway, I don't think we have any streaming DMA used on these RealView
boards.

Yes, I think that is correct. MMCI, SSP and serial could all use
DMA but are not configured to do it.

PB1176 has no working DMA (borked DMA hardware), the PB11MPCore
actually has working DMA but only on UART TX and maybe AACI
(haven't tested) no clue about the Cortex boards PBA8 and PBX though.

I don't see any DMA data passed to the pl011 driver for PB11MPCore
or any other realview board, so even if it works, we don't use it.

No I was more saying it works in theory... and we actually have
patches to enable it for e.g. memcpy on Versatile and PB11MP
that I floated at times, Russell also experimented around with it.

The AACI driver doesn't seem to support DMA.

Nope, but the hardware does.

PBA8 and PBX don't need the hack because they don't have a broken
l2x0.

True!

Yours,
Linus Walleij