在Linux中更改U-Boot环境变量

huangapple
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英文:

Change U-Boot Environment Variable in Linux

问题

我想通过fw_setenv命令在Linux中更改u-boot环境变量。当我尝试使用fw_printenv打印环境变量时，没有错误或警告，它正常工作。但是，当我尝试更改这些变量时，我收到错误消息："无法打开/dev/mtd4：权限被拒绝"。以下是我的设置：

在DTS中：

  1. nor@0,0 {
  2. 	#address-cells = <1>;
  3. 	#size-cells = <1>;
  4. 	compatible = "cfi-flash";
  5. 	reg=<0x0 0x0 0x1000000>;
  6. 	bank-width = <2>;
  7. 	device-width = <1>;
  9. 	partition@0 {
  10. 		/* This location must not be altered  */
  11. 		/* 256KB for Vitesse 7385 Switch firmware */
  12. 		reg=<0x0 0x00040000>;
  13. 		label="NOR Vitesse-7385 Firmware";
  14. 		read-only;
  15. 	};
  17. 	partition@40000 {
  18. 		/* 256KB for DTB Image */
  19. 		reg=<0x00040000 0x00040000>;
  20. 		label = "NOR DTB Image";
  21. 	};
  23. 	partition@80000 {
  24. 		/* 3.5 MB for Linux Kernel Image */
  25. 		reg = <0x00080000 0x00380000>;
  26. 		label = "NOR Linux Kernel Image";
  27. 	};
  29. 	partition@400000 {
  30. 		/* 11MB for JFFS2 based Root file System */
  31. 		reg=<0x00400000 0x00b00000>;
  32. 		label = "NOR JFFS2 Root File System";
  33. 	};
  35. 	partition@f20000 {
  36. 		/* 8KB for u-boot Environment Variables */
  37. 		reg=<0x00f20000 0x00002000>;
  38. 		label = "NOR U-Boot Environment Variable";
  39. 	};
  41. 	partition@f40000 {
  42. 		/* This location must not be altered  */
  43. 		/* 512KB for u-boot Bootloader Image */
  44. 		reg=<0x00f40000 0x000C0000>;
  45. 		label = "NOR U-Boot Image";
  46. 	};

};

在Linux中：

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

这些配置有什么问题？
感谢帮助。

英文:

I want to change u-boot environment variables in Linux via fw_setenv command. When i try to print environment variables via fw_printenv there is no error or warning, it works fine. However, when I try to change these variables I got an error: "Can't open /dev/mtd4: Permission denied". Here my settings:

In DTS:

  1. nor@0,0 {
  2. 	#address-cells = &lt;1&gt;;
  3. 	#size-cells = &lt;1&gt;;
  4. 	compatible = &quot;cfi-flash&quot;;
  5. 	reg=&lt;0x0 0x0 0x1000000&gt;;
  6. 	bank-width = &lt;2&gt;;
  7. 	device-width = &lt;1&gt;;
  9. 	partition@0 {
  10. 		/* This location must not be altered  */
  11. 		/* 256KB for Vitesse 7385 Switch firmware */
  12. 		reg=&lt;0x0 0x00040000&gt;;
  13. 		label=&quot;NOR Vitesse-7385 Firmware&quot;;
  14. 		read-only;
  15. 	};
  17. 	partition@40000 {
  18. 		/* 256KB for DTB Image */
  19. 		reg=&lt;0x00040000 0x00040000&gt;;
  20. 		label = &quot;NOR DTB Image&quot;;
  21. 	};
  23. 	partition@80000 {
  24. 		/* 3.5 MB for Linux Kernel Image */
  25. 		reg = &lt;0x00080000 0x00380000&gt;;
  26. 		label = &quot;NOR Linux Kernel Image&quot;;
  27. 	};
  29. 	partition@400000 {
  30. 		/* 11MB for JFFS2 based Root file System */
  31. 		reg=&lt;0x00400000 0x00b00000&gt;;
  32. 		label = &quot;NOR JFFS2 Root File System&quot;;
  33. 	};
  35. 	partition@f20000 {
  36. 		/* 8KB for u-boot Environment Variables */
  37. 		reg=&lt;0x00f20000 0x00002000&gt;;
  38. 		label = &quot;NOR U-Boot Environment Variable&quot;;
  39. 	};
  41. 	partition@f40000 {
  42. 		/* This location must not be altered  */
  43. 		/* 512KB for u-boot Bootloader Image */
  44. 		reg=&lt;0x00f40000 0x000C0000&gt;;
  45. 		label = &quot;NOR U-Boot Image&quot;;
  46. 	};

};

In Linux:

  1. mtd0: 00040000 00020000 &quot;NOR Vitesse-7385 Firmware&quot;
  2. mtd1: 00040000 00020000 &quot;NOR DTB Image&quot;
  3. mtd2: 00380000 00020000 &quot;NOR Linux Kernel Image&quot;
  4. mtd3: 00b00000 00020000 &quot;NOR JFFS2 Root File System&quot;
  5. mtd4: 00002000 00020000 &quot;NOR U-Boot Environment Variable&quot;
  6. mtd5: 000c0000 00020000 &quot;NOR U-Boot Image&quot;

What is wrong in these configurations?
Thanks for the help..

答案1

得分: 1

  1. Partition size is 8 kb but flash erasesize is 128 kb. Partition must start and end on erase/write block boundary to be writeable.
英文: 
  1. mtd4: 00002000 00020000 &quot;NOR U-Boot Environment Variable&quot;

Partition size is 8 kb but flash erasesize is 128 kb. Partition must start and end on erase/write block boundary to be writeable.

huangapple
  • 本文由 发表于 2023年7月31日 20:51:19
  • 转载请务必保留本文链接：https://go.coder-hub.com/76803815.html
  • embedded-linux
  • linux
  • linux-kernel
  • u-boot
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