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Why is not written into the nand flash?

qiu li
Prodigy 250 points

 the command  inside the uboot:

tftp 0xc0700000 file.yaffs

nand erase 0x10000000   //

nand write.yaffs 0xc0700000 0x10000000 0xSize(file.txt) //this address have data and correct.

nand write.yaffs 0xc0700000 0x20000000 0xSize(file.txt) //this address donnot have data.

This is why, Is it also needs to pass tftp?

 

Thanks!

qiu li