openwrt fit

Openrt FIT（Flattened Image Tree）是OpenWrt操作系统中的一种文件格式，用于将多个组件打包成一个镜像文件。FIT文件中包含了内核、设备树和配置等信息。FIT文件的生成可以通过使用mkimage工具，并结合指定的FIT文件描述文件（.its文件）来完成。

在OpenWrt中生成FIT文件的命令示例可以如下所示：

mkimage -f /home/my/openwrt/build_dir/target-riscv64_riscv64_musl/linux-sunxid1/my-kernel.bin.its /home/my/openwrt/build_dir/target-riscv64_riscv64_musl/linux-sunxid1/my-kernel.bin.new

其中，`/home/my/openwrt/build_dir/target-riscv64_riscv64_musl/linux-sunxid1/my-kernel.bin.its`为FIT文件描述文件，`/home/my/openwrt/build_dir/target-riscv64_riscv64_musl/linux-sunxid1/my-kernel.bin.new`为生成的FIT文件的输出路径。

FIT文件描述文件（.its文件）的结构如下所示：

/dts-v1/;
/ {
    description = "RISCV OpenWrt FIT (Flattened Image Tree)";
    #address-cells = <1>;
    images {
        kernel-1 {
            description = "RISCV OpenWrt Linux-5.15.31";
            data = /incbin/("/home/my/openwrt/build_dir/target-riscv64_riscv64_musl/linux-sunxid1/my-kernel.bin");
            type = "kernel";
            arch = "riscv";
            os = "linux";
            compression = "none";
            load = <0x40200000>;
            entry = <0x40200000>;
            hash@1 {
                algo = "crc32";
            };
            hash@2 {
                algo = "sha1";
            };
        };
        fdt-1 {
            description = "RISCV OpenWrt my device tree blob";
            data = /incbin/("/home/my/openwrt/build_dir/target-riscv64_riscv64_musl/linux-sunxid1/linux-5.15.31/arch/riscv/boot/dts/allwinner/my.dtb");
            type = "flat_dt";
            arch = "riscv";
            compression = "none";
            hash@1 {
                algo = "crc32";
            };
            hash@2 {
                algo = "sha1";
            };
        };
    };
    configurations {
        default = "config-1";
        config-1 {
            description = "OpenWrt my";
            kernel = "kernel-1";
            fdt = "fdt-1";
        };
    };
};

其中，`images`节点包含了内核和设备树的信息，`configurations`节点定义了不同的配置选项，并指定了对应的内核和设备树。

总结来说，OpenWrt FIT是OpenWrt操作系统中的一种文件格式，可用于打包内核、设备树和配置等信息。通过使用mkimage工具和FIT文件描述文件，可以生成FIT文件并指定不同的配置选项。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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