[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] cubieboard2's sd/mmc driver on xen about DMA read data error
On Wed, 2 Apr 2014, Ian Campbell wrote: > On Wed, 2014-04-02 at 00:10 +0800, æç wrote: > > Hi all, > > Hello, > > > I have got this kernel with mmc driver on cubieboard2 from : > > https://github.com/jwrdegoede/linux-sunxi.git (test branch) . > > I have made the Xen's Dom0 configuration according > > this :http://wiki.xenproject.org/wiki/Mainline_Linux_Kernel_Configs. > > and the kernel can be booted by Xen4.4. > > The question we met is that some CMD can be > > accepted(CMD7,CMD0 ....) and but some can't(CMD52,CMD5,CMD51). > > We have found that the CMD51 is attempted to read the data from > > SD card to memory through DMA , so we replaced all the dma_ops with > > xen_dma_ops , where it is in struct "dma_map_ops xen_swiotlb_dma_ops" > > in arch/arm/xen/mm.c. > > Do I understand correctly that you have solved the issue by doing this? Where did you replace the dma_ops with xen_dma_ops? Could you please send out a patch so that I can understand what you modified exactly? Keep in mind that for Dom0, get_dma_ops should already return xen_dma_ops (see arch/arm/include/asm/dma-mapping.h:get_dma_ops), so in theory you should already be getting the xen_dma_ops without having to do anything. So maybe the MMC driver is calling the arm_dma_ops functions directly without going through get_dma_ops? It seems unlikely to me. Can you point me to the right MMC driver in Linux that you are using? _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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