uboot移植-NAND FLASH写入错误

U-Boot 2009.08 (Oct 25 2018 - 19:30:36)

DRAM:  64 MB
Flash:  2 MB
NAND:  256 MiB
*** Warning - bad CRC or NAND, using default environment

In:    serial
Out:   serial
Err:   serial
SMDK2440 # saveenv
Saving Environment to NAND...
Erasing Nand...
Erasing at 0x2 -- 393216% complete.
Writing to Nand... FAILED!
SMDK2440 #

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