请求协助基于Petalinux生成的pl.dtsi编写system-user.dtsi以构建启动镜像

在Petalinux环境中，system-user.dtsi用于扩展或自定义设备树，无需重复pl.dtsi中的amba_pl根节点，只需将AXI DMA节点挂载到已有的&amba_pl节点下即可。以下是适配的system-user.dtsi内容：

/include/ "system-conf.dtsi"

/ {
};

&amba_pl {
    axi_dma_0: dma@40400000 {
        #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-7.1", "xlnx,axi-dma-1.00.a";
        interrupt-names = "mm2s_introut", "s2mm_introut";
        interrupt-parent = <&intc>;
        interrupts = <0 29 4 0 30 4>;
        reg = <0x40400000 0x10000>;
        xlnx,addrwidth = <0x20>;
        xlnx,include-sg;
        xlnx,sg-length-width = <0xe>;

        dma-channel@40400000 {
            compatible = "xlnx,axi-dma-mm2s-channel";
            dma-channels = <0x1>;
            interrupts = <0 29 4>;
            xlnx,datawidth = <0x20>;
            xlnx,device-id = <0x0>;
        };

        dma-channel@40400030 {
            compatible = "xlnx,axi-dma-s2mm-channel";
            dma-channels = <0x1>;
            interrupts = <0 30 4>;
            xlnx,datawidth = <0x20>;
            xlnx,device-id = <0x0>;
        };
    };
};

注意事项 #

• 确认系统设备树中已正确定义&clkc（时钟控制器）和&intc（中断控制器）节点，原pl.dtsi中引用的时钟索引15和中断号需匹配实际硬件配置
• 若要启用AXI DMA驱动，需在Petalinux配置中开启对应支持：执行petalinux-config，在Kernel Drivers -> DMA support下勾选Xilinx AXI DMA support
• 编译启动镜像时，Petalinux会自动合并system-user.dtsi与其他设备树文件，无需手动处理合并逻辑

内容的提问来源于stack exchange，提问作者Creator