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配置和生成

Flattened Image Tree 顾名思义，是参考 Flattened Device Tree 命令而来，使用 DTS 的语法， 通过一些新增的节点，描述生成镜像文件所使用的 Image 文件和配置。

例子如： source/uboot-2021.10/doc/uImage.FIT/kernel_fdt.its
/dts-v1/;

/ {
    description = "Simple image with single Linux kernel and FDT blob";
    #address-cells = <1>;

    images {
            kernel {
                    description = "Vanilla Linux kernel";
                    data = /incbin/("./vmlinux.bin.gz");
                    type = "kernel";
                    arch = "ppc";
                    os = "linux";
                    compression = "gzip";
                    load = <00000000>;
                    entry = <00000000>;
                    hash-1 {
                            algo = "crc32";
                    };
                    hash-2 {
                            algo = "sha1";
                    };
            };
            fdt-1 {
                    description = "Flattened Device Tree blob";
                    data = /incbin/("./target.dtb");
                    type = "flat_dt";
                    arch = "ppc";
                    compression = "none";
                    hash-1 {
                            algo = "crc32";
                    };
                    hash-2 {
                            algo = "sha1";
                    };
            };
    };

    configurations {
            default = "conf-1";
            conf-1 {
                    description = "Boot Linux kernel with FDT blob";
                    kernel = "kernel";
                    fdt = "fdt-1";
            };
    };
};

此处描述的一个配置，其中包含了 fdt + kernel，以及校验方式。

生成 itb image的命令：
mkimage -f kernel_fdt.its kernel_fdt.itb