Project Scenario:
when creating a petalinux system using Xilinx’s petalinux tool, modify the device tree file pl.dtsi by adding a reference to the system-user.dtsi file

Problem description:
cannot modify pl.dtsi configuration through system-user.dtsi

/include/ "system-conf.dtsi"
/{
};
 
&amba_pl{
    axidma_chrdev: axidma_chrdev@0 {
            compatible = "xlnx,axidma-chrdev";
            dmas = <&axi_dma_0 0 &axi_dma_0 1>;
            dma-names = "tx_channel", "rx_channel";
    };
};
 
&axi_dma_0{
    dma-channel@40400000 {
        xlnx,device-id = <0x0>;
    };
    dma-channel@40400030 {
        xlnx,device-id = <0x1>;
    };
}

Reason analysis:
system-user. Dtsi file format error, space between dma and {!!!

Solutions:
modify the code format, create system.dtb, use the following statement to reverse generate DTS file, found that part of the pl configuration has been successfully modified!

dtc -I dtb -O dts -o system.dts system.dtb

Modified code:

/include/ "system-conf.dtsi"
/{
};
 
&amba_pl {
    axidma_chrdev: axidma_chrdev@0 {
            compatible = "xlnx,axidma-chrdev";
            dmas = <&axi_dma_0 0 &axi_dma_0 1>;
            dma-names = "tx_channel", "rx_channel";
    };
};
 
&axi_dma_0 {
    dma-channel@40400000 {
        xlnx,device-id = <0x0>;
    };
    dma-channel@40400030 {
        xlnx,device-id = <0x1>;
    };
}

Results in system. DTS: