Hi, I've instantiated a DMA in my Zynq project with Linux and it is working fine. Now my module needs a second DMA to read and write different data from the memory, these two DMAs will communicate with the same module inside the FPGA using AXIS (but right now is all loop back).
When I edit my device tree just replicating the first one and changing the address I get a panic message from Kernel :
Unhandled fault: imprecise external abort (0x406) at 0x00000000
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000007
\0x14CPU1: stopping
\0x14CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.15.0-xilinx #1
@h\0xc5\0x1a\0xc1013f00>] (unwind_backtrace) from [<c0010570>] (show_stack+0x10/0x14)
P[<c0010570>] (show_stack) from [<c04ec2a0>] (dump_stack+0x88/0xd8)
([<c04ec2a0>] (dump_stack) from [<c0012810>] (ipi_cpu_stop+0x3c/0x6c)
\0x14[<c0012810>] (ipi_cpu_stop) from [<c0012eac>] (handle_IPI+0x60/0x80)
\0x14[<c0012eac>] (handle_IPI) from [<c00084e0>] (gic_handle_irq+0x54/0x5c)
([<c00084e0>] (gic_handle_irq) from [<c0010f80>] (__irq_svc+0x40/0x70)
\0x14Exception stack(0xe6c8bf68 to 0xe6c8bfb0)
\0x14bf60: e6c8bfb0 00000004 fcfe7cca 00000000 e71a10e0 00000000
\0x14bf80: fcba6ca3 00000000 c0727e98 413fc090 c0727e98 00000000 00000000 e6c8bfb0
\0x14bfa0: c005d248 c03a2058 60000113 ffffffff
([<c0010f80>] (__irq_svc) from [<c03a2058>] (cpuidle_enter_state+0x50/0xe8)
([<c03a2058>] (cpuidle_enter_state) from [<c004d50c>] (cpu_startup_entry+0x14c/0x1c0)
\0x14[<c004d50c>] (cpu_startup_entry) from [<00008584>] (0x8584)
\0x14---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000007
my original and working device tree address is
axi_dma_0: axi_dma_0@40400000 {
axistream-connected = <&axi_dma_0>;
axistream-control-connected = <&axi_dma_0>;
#dma-cells = <1>;
clock-names = "s_axi_lite_aclk", "m_axi_sg_aclk", "m_axi_mm2s_aclk", "m_axi_s2mm_aclk";
clocks = <&clkc 15>, <&clkc 15>, <&clkc 15>, <&clkc 15>;
compatible = "xlnx,axi-dma","xlnx,axi-dma-1.00.a","xlnx,axi-dma-6.03.a";
interrupt-names = "mm2s_introut", "s2mm_introut";
interrupt-parent = <&intc>;
interrupts = <0 33 4 0 34 4>;
xlnx,enable-multi-channel = <0x0>;
xlnx,family = "zynq";
xlnx,generic = <0x0>;
xlnx,include-mm2s = <0x1>;
xlnx,include-mm2s-dre = <0x1>;
xlnx,include-mm2s-sf = <0x1>;
xlnx,include-s2mm = <0x1>;
xlnx,include-s2mm-dre = <0x1>;
xlnx,include-s2mm-sf = <0x1>;
xlnx,instance = "axi_dma_0";
xlnx,mm2s-burst-size = <16>;
xlnx,s2mm-burst-size = <16>;
reg = <0x40400000 0x10000>;
//xlnx,include-sg;
xlnx,addrwidth = <64>;
//xlnx,sg-length-width = <64>;
dma-channel@40400000 {
compatible = "xlnx,axi-dma-mm2s-channel";
dma-channels = <0x1>;
interrupts = <0 33 4>;
xlnx,datawidth = <64>;
xlnx,device-id = <0x0>;
};
dma-channel@40400030 {
compatible = "xlnx,axi-dma-s2mm-channel";
dma-channels = <0x1>;
interrupts = <0 34 4>;
xlnx,datawidth = <64>;
xlnx,device-id = <0x1>;
};
};
axidmatest_1: axidmatest@1 {
compatible ="xlnx,axi-dma-test-1.00.a";
dmas = <&axi_dma_0 0
&axi_dma_0 1>;
dma-names = "axidma0", "axidma1";
};
which I just duplicated for :
axi_dma_1: axi_dma_1@40410000 {
axistream-connected = <&axi_dma_1>;
axistream-control-connected = <&axi_dma_1>;
#dma-cells = <1>;
clock-names = "s_axi_lite_aclk", "m_axi_sg_aclk", "m_axi_mm2s_aclk", "m_axi_s2mm_aclk";
clocks = <&clkc 15>, <&clkc 15>, <&clkc 15>, <&clkc 15>;
compatible = "xlnx,axi-dma","xlnx,axi-dma-1.00.a","xlnx,axi-dma-6.03.a";
interrupt-names = "mm2s_introut", "s2mm_introut";
interrupt-parent = <&intc>;
interrupts = <0 35 4 0 36 4>;
xlnx,enable-multi-channel = <0x0>;
xlnx,family = "zynq";
xlnx,generic = <0x0>;
xlnx,include-mm2s = <0x1>;
xlnx,include-mm2s-dre = <0x1>;
xlnx,include-mm2s-sf = <0x1>;
xlnx,include-s2mm = <0x1>;
xlnx,include-s2mm-dre = <0x1>;
xlnx,include-s2mm-sf = <0x1>;
xlnx,instance = "axi_dma_0";
xlnx,mm2s-burst-size = <16>;
xlnx,s2mm-burst-size = <16>;
reg = <0x40410000 0x10000>;
//xlnx,include-sg;
xlnx,addrwidth = <64>;
//xlnx,sg-length-width = <64>;
dma-channel@40410000 {
compatible = "xlnx,axi-dma-mm2s-channel";
dma-channels = <0x1>;
interrupts = <0 35 4>;
xlnx,datawidth = <64>;
xlnx,device-id = <0x2>;
};
dma-channel@40410030 {
compatible = "xlnx,axi-dma-s2mm-channel";
dma-channels = <0x1>;
interrupts = <0 36 4>;
xlnx,datawidth = <64>;
xlnx,device-id = <0x3>;
};
};
axidmatest_2: axidmatest@2 {
compatible ="xlnx,axi-dma-test-1.00.a";
dmas = <&axi_dma_1 0
&axi_dma_1 1>;
dma-names = "axidma2", "axidma3";
};
A FURTHER question is :
is it better if the use a new second HP at Zynq , HP1 and for my second DMA ?
