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Subject: [P.A. Semi] Does the ethernet interface work on your Electra, Chitra,
 Nemo, and Athena board?
To: Michael Ellerman <mpe@ellerman.id.au>, Gabriel Paubert <paubert@iram.es>,
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From: Christian Zigotzky <chzigotzky@xenosoft.de>
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Date: Mon, 7 Dec 2015 15:12:08 +0100
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Hi all,

I have some good news for you. I was able to fix the issue with the P.A. 
Semi Ethernet. It was a problem with the new DMA handling. The patch ' 
[RFC/PATCH,v2] powerpc/iommu: Support "hybrid" iommu/direct DMA ops for 
coherent_mask < dma_mask (https://patchwork.ozlabs.org/patch/472535/)' 
is the problem.

I had patched the following files before I compiled a kernel.

arch/powerpc/Kconfig
arch/powerpc/include/asm/device.h
arch/powerpc/include/asm/dma-mapping.h
arch/powerpc/include/asm/iommu.h
arch/powerpc/kernel/dma-iommu.c
arch/powerpc/kernel/dma-swiotlb.c
arch/powerpc/kernel/dma.c
arch/powerpc/platforms/powernv/pci-ioda.c
arch/powerpc/platforms/pseries/iommu.c
arch/powerpc/sysdev/dart_iommu.c
include/asm-generic/dma-mapping-common.h

The P.A. Semi Ethernet works again with the patched kernel.

I am happy. :-)

Please fix the issue in the kernel source code.

Thanks in advance,

Christian