Re: use generic DMA mapping code in powerpc V4

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On 15 January 2019 at 2:35PM, Christoph Hellwig wrote:
On Tue, Jan 15, 2019 at 11:55:25AM +0100, Christian Zigotzky wrote:
Next step: 21074ef03c0816ae158721a78cabe9035938dddd (powerpc/dma: use the
generic direct mapping bypass)

git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.6 a

git checkout 21074ef03c0816ae158721a78cabe9035938dddd

I was able to compile the kernel for the AmigaOne X1000 (Nemo board with PA
Semi PA6T-1682M SoC). It boots but the PA Semi onboard ethernet doesn't
work.
Thanks.  But we are exactly missing the steps that are relevant.  I've
pushed a fixed up powerpc-dma.6 tree, which will only change starting from
the first commit that didn't link.

The first commit that changed from the old one is this one:

http://git.infradead.org/users/hch/misc.git/commitdiff/257002094bc5935dd63207a380d9698ab81f0775

which was that one that your compile failed on first.

Thanks again for all your work!

Thank you! I tried the commit 240d7ecd7f6fa62e074e8a835e620047954f0b28 (powerpc/dma: use the dma-direct allocator for coherent platforms) again.

git clone git://git.infradead.org/users/hch/misc.git -b powerpc-dma.6 a

git checkout 240d7ecd7f6fa62e074e8a835e620047954f0b28

I modified the 'dma.c' patch because of the undefined references to '__dma_nommu_free_coherent' and '__dma_nommu_alloc_coherent':

---

@@ -163,8 +99,13 @@ static inline void dma_nommu_sync_single(struct device *dev,
 #endif

 const struct dma_map_ops dma_nommu_ops = {
+       .alloc                          = dma_direct_alloc,
+       .free                           = dma_direct_free,
        .map_sg                         = dma_nommu_map_sg,
        .unmap_sg                       = dma_nommu_unmap_sg,
        .dma_supported                  = dma_direct_supported,

---

The X1000 boots and the PASEMI onboard ethernet works! X5000 (P5020 board): U-Boot loads the kernel and the dtb file. Then the kernel starts but it doesn't find any hard disks (partitions).

-- Christian




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