fw_printenv/fw_setenv can't work in my arm-linux board's userspace?

@author : Mingling.lu@date   : 2015年11月23日 08:53:22@e-mail : [e-mail]

How to get fw_printenv/fw_setenv?

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cd $(U_BOOTDIR)make envls tools/env/Then you will find fw_printenv . rename $(U-BOOTDIR)/tools/env/fw_printenv.c     $(U_BOOTDIR)/tools/env/fw_setenv.cmake envls tools/env/Then you will find fw_setenv. 

How to use fw_printenv/fw_setenv in my arm-linux board’s userspace?

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fw_printenv usage example:[root@demobaord] fw_printenvfw_setenv usage example:[root@demobaord] fw_setenv bootdelay 1 

*note : fw_printenv will change env’s value in SDRAM, not write into nandflash/norflash/eeprom., but, fw_setenv will write env’s value into nandflash/norflash/eeprom.

Why am I can’t run fw_printenv/fw_setenv in my arm-linux board’s userspace?

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• Maybe your u-boot and your linux kernel use different ECC mode,You must ensure your u-boot and your kernel use same ECC mode if you use NandFlash to store ENV.
• Your u-boot’s CROSS_COMPILE must be same as your kernel’s CROSS_COMPILE.

Last but not least

To sump up, if you want to use fw_printenv/fw_setenv in Userspace, I think you should be clear ECC mode if you use NandFlash to store your ENV parameter.U-boot’s nand Ecc mode must be same as your linux kernel’s ECC mode.