[HELP]: Wrong u_boot into flash

[kader_73]

Doing some research in stlinux site, I found this

For NAND Flash

In the case of NAND flash, the flash should be explicitly erased, prior to writing to it.
In the case of NAND, then most access operations need to be multiples of certain page/block sizes. For simplicity, the following code assumes that u-boot.bin fits in 256 KiB (0x40000). However, you may use smallest figures that are appropriately aligned.

  MB680> nfs $load_addr /export/u-boot.bin
MB680> nand erase 0 40000
MB680> nand write $load_addr 0 40000

Since the U_Boot variable "load_addr=0x80000000" , can I use these two commands as prescribed after the mtd0 file being loaded on RAM.

I'm trying doing my best , but still need help .

Regards