use generic DMA mapping code in powerpc V4

[Christian Zigotzky]

On 05 December 2018 at 3:05PM, Christoph Hellwig wrote:
>
> Thanks.  Can you try a few stepping points in the tree?
>
> First just with commit 7fd3bb05b73beea1f9840b505aa09beb9c75a8c6
> (the first one) applied?
>
> Second with all commits up to 5da11e49df21f21dac25a2491aa788307bdacb6b
>
> And if that still works with commits up to
> c1bfcad4b0cf38ce5b00f7ad880d3a13484c123a
>
Hi Christoph,

I undid the commit 7fd3bb05b73beea1f9840b505aa09beb9c75a8c6 with the 
following command:

git checkout 7fd3bb05b73beea1f9840b505aa09beb9c75a8c6

Result: PASEMI onboard ethernet works again and the P5020 board boots.

I will test the other commits in the next days.

@All
It is really important, that you also test Christoph's work on your 
PASEMI and NXP boards. Could you please help us with solving the issues?

'git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.5 a'

Thanks,
Christian