Accessing DMA in PL kernal crash with ZC702

[diya-]

Hi

 

I am using an evaluation board with ZC702 and implemented an AXI DMA in PL logic(to access DDR connected to PS). we have ported kernel 4.6.0 and used inbuilt axi dma test driver to access DMA in PL. kernel crashes when trying to access PL DMA at address 0x40400000. below is device tree configuration,

 

axi_vdma_0: axivdma@40400000{
        compatible = "xlnx,axi-dma-test-1.00.a";
        #dma-cells = <1>;
        reg = < 0x40400000 0x10000 >;
        xlnx,include-sg = <0x0>;
        dma-ranges = <0x00000000 0x00000000 0x40000000>;
        xlnx,num-fstores = <0x8>;
        xlnx,flush-fsync = <0x1>;
        xlnx,addrwidth = <0x20>;

        clocks = <&clkc 15>, <&clkc 15>, <&clkc 15>, <&clkc 15>;
        clock-names = "s_axi_lite_aclk", "m_axi_mm2s_aclk", "m_axi_s2mm_aclk","m_axi_sg_aclk",
                      "m_axis_mm2s_aclk", "s_axis_s2mm_aclk";

        dma-channel@40400000 {
                                compatible = "xlnx,axi-dma-mm2s-channel";
                                interrupts = < 0 61 4 >;
                                dma-channels = < 0x1 >;
                                xlnx,datawidth = <0x20>;
                                xlnx,device-id = <0x0>;
       } ;
        dma-channel@40400030 {
                                compatible = "xlnx,axi-dma-s2mm-channel";
                                dma-channels = < 0x1 >;
                                xlnx,datawidth = <0x20>;
                                xlnx,device-id = <0x0>;
        } ;
        } ;
         dmatest_0: dmatest@0 {
                        compatible ="xlnx,axi-dma-test-1.00.a";
                        dmas = <&axi_vdma_0 0
                                &axi_vdma_0 1>;
                        dma-names = "dma0", "dma1";
       } ;

any help in understanding the issue is appreciated.

[jpeyron]

Hi @diya-,

I do not have much experience with this using embedded linux. Here is a forum thread that might be helpful. I have reached out to our embedded engineer to see if they have any input for you.

thank you,

Jon