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TMDXEVM8148 saveenv command fail

Hi,

I try to download the Linux kernel image from the TFTP server and  mounting NFS. But when I configure U_Boot in the 2nd stage U_Boot prompt on the serial console and try to save with the command saveenv, I have this error.

TI8148_EVM#saveenv                                                              
Saving Environment to NAND...                                                   
Erasing Nand...

I read these threads but not understand how to do.

https://e2e.ti.com/support/arm/sitara_arm/f/791/t/593562?tisearch=e2e-sitesearch&keymatch=saveenv

https://e2e.ti.com/support/arm/sitara_arm/f/791/t/639727?tisearch=e2e-sitesearch&keymatch=saveenv

Please help. Thanks

Ubuntu 10.04 LTS

EZSDK 5_05_02_00