用zImage生成image.ub的方法

1. 准备一个fitimage.its文件，文件内容可参考如下：

/dts-v1/;
 
/ {
        description = "U-Boot fitImage for plnx_arm kernel";
        #address-cells = <1>;
 
        images {
                kernel@0 {
                        description = "Linux Kernel";
                        data = /incbin/("/home/zs/work/hsi-proj/navigator/linux-xlnx-xilinx-v2018.3/arch/arm/boot/zImage");
                        type = "kernel";
                        arch = "arm";
                        os = "linux";
                        compression = "none";
                        load = <0x8000>;
                        entry = <0x8000>;
                        hash@1 {
                                algo = "sha1";
                        };
                };
                fdt@0 {
                        description = "Flattened Device Tree blob";
                        data = /incbin/("/home/zs/work/hsi-proj/navigator/linux-xlnx-xilinx-v2018.3/arch/arm/boot/dts/system-top.dtb");
                        type = "flat_dt";
                        arch = "arm";
                        compression = "none";
                        hash@1 {
                                algo = "sha1";
                        };
                };
                ramdisk@0 {
                        description = "ramdisk";
                        data = /incbin/("/home/zs/work/petalinux-proj/ALIENTEK-ZYNQ/images/linux/rootfs.cpio.gz");
                        type = "ramdisk";
                        arch = "arm";
                        os = "linux";
                        compression = "gzip";
                        hash@1 {
                                algo = "sha1";
                        };
                };
        };
        configurations {
                default = "conf@1";
                conf@1 {
                        description = "Boot Linux kernel with FDT blob + ramdisk";
                        kernel = "kernel@0";
                        fdt = "fdt@0";
                        ramdisk = "ramdisk@0";
                        hash@1 {
                                algo = "sha1";
                        };
                };
                conf@2 {
                        description = "Boot Linux kernel with FDT blob";
                        kernel = "kernel@0";
                        fdt = "fdt@0";
                        hash@1 {
                                algo = "sha1";
                        };
                };
        };
};

fitimage.its文件中各属性的具体含义可参考：u-boot FIT image介绍

2. 执行指令 mkimage -f fitimage.its image.ub生成image.ub（没安装u-boot-tools工具的话需要先安装）。