fw_printenv/fw_setenv can't work in my arm-linux board's userspace?
阿新 • • 發佈：2019-02-18
@author : Mingling.lu
@date : 2015年11月23日 08:53:22
@e-mail : mingllu@163.comHow to get fw_printenv/fw_setenv?
cd $(U_BOOTDIR)
make env
ls tools/env/
Then you will find fw_printenv .
rename $(U-BOOTDIR)/tools/env/fw_printenv.c $(U_BOOTDIR)/tools/env/fw_setenv.c
make env
ls tools/env/
Then you will find fw_setenv. How to use fw_printenv/fw_setenv in my arm-linux board’s userspace?
fw_printenv usage example:
[root@demobaord] fw_printenv
fw_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?
- 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.