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我想通过fw_setenv命令更改Linux中的u-boot环境变量。当我尝试通过fw_printenv打印环境变量时，没有错误或警告，它工作正常。然而，当我尝试更改这些变量时，我得到了一个错误：“无法打开/dev/mtd 4：权限被拒绝”。我的设置如下：
在DTS中：

nor@0,0 {
    #address-cells = <1>;
    #size-cells = <1>;
    compatible = "cfi-flash";
    reg=<0x0 0x0 0x1000000>;
    bank-width = <2>;
    device-width = <1>;

    partition@0 {
        /* This location must not be altered  */
        /* 256KB for Vitesse 7385 Switch firmware */
        reg=<0x0 0x00040000>;
        label="NOR Vitesse-7385 Firmware";
        read-only;
    };

    partition@40000 {
        /* 256KB for DTB Image */
        reg=<0x00040000 0x00040000>;
        label = "NOR DTB Image";
    };

    partition@80000 {
        /* 3.5 MB for Linux Kernel Image */
        reg = <0x00080000 0x00380000>;
        label = "NOR Linux Kernel Image";
    };

    partition@400000 {
        /* 11MB for JFFS2 based Root file System */
        reg=<0x00400000 0x00b00000>;
        label = "NOR JFFS2 Root File System";
    };

    partition@f20000 {
        /* 8KB for u-boot Environment Variables */
        reg=<0x00f20000 0x00002000>;
        label = "NOR U-Boot Environment Variable";
    };

    partition@f40000 {
        /* This location must not be altered  */
        /* 512KB for u-boot Bootloader Image */
        reg=<0x00f40000 0x000C0000>;
        label = "NOR U-Boot Image";
    };

字符串
};
在Linux中：

mtd0: 00040000 00020000 "NOR Vitesse-7385 Firmware"
mtd1: 00040000 00020000 "NOR DTB Image"
mtd2: 00380000 00020000 "NOR Linux Kernel Image"
mtd3: 00b00000 00020000 "NOR JFFS2 Root File System"
mtd4: 00002000 00020000 "NOR U-Boot Environment Variable"
mtd5: 000c0000 00020000 "NOR U-Boot Image"

型
这些配置中有什么问题？谢谢你的帮助..