你好，我买了一块Spectrum Digital DM816x/AM389x EVM （含daughter 板）。之前自己配置了环境，可以启动。后来我在uboot中输入了 nand scrub 指令，从此就无法启动uboot了，我知道这个应该是nand flash 被清空了，所有我按照说明文档在ccs下进行了uboot 烧写，步骤如下
1、SW3拨码开关打到全“0”，SW4[10]，打开CCS5.2 ，导入host-tools/src/nand-flash-writer工程，编译后，下载nand-flash-writer.out 文件，并运行。内容如下：
[CortexA8] Welcome to CCS Nand Flash Utility
[CortexA8]
[CortexA8] Choose your operation
[CortexA8] Enter 1 ---> To Flash an Image
[CortexA8] Enter 2 ---> To ERASE the whole NAND
[CortexA8] Enter 3 ---> To EXIT
2
[CortexA8] Starting NETRA NAND writer
[CortexA8]
[CortexA8] ----------------------
[CortexA8] NAND FLASH DETAILS
[CortexA8] ----------------------
[CortexA8] Device ID : 0xca
[CortexA8] Manufacture ID : 0x2c
[CortexA8] Page Size : 2048 Bytes
[CortexA8] Spare Size : 64 Bytes
[CortexA8] Pages_Per_Block : 64
[CortexA8] Number_of_Blocks : 2048
[CortexA8] Device_width : 2 Byte
[CortexA8] DeviceSize : 256 MB
[CortexA8]
[CortexA8] Performing Global Nand Erase
[CortexA8] ... done
[CortexA8]
[CortexA8] NAND flashing successful!
[CortexA8] Welcome to CCS Nand Flash Utility
[CortexA8]
[CortexA8]
[CortexA8] Choose your operation
[CortexA8] Enter 1 ---> To Flash an Image
[CortexA8] Enter 2 ---> To ERASE the whole NAND
[CortexA8] Enter 3 ---> To EXIT
1
[CortexA8] Enter image file path
E:\my\sharedfiles\DVRRDK_03.00.00.00\pre_built_binary\ti816x_dvr\uboot_NAND_DM816X_DVR
[CortexA8] Enter offset (in hex):
0
[CortexA8] Choose the ECC scheme from given options :
[CortexA8] Enter 1 ---> BCH 8-bit
[CortexA8] Enter 2 ---> HAM
[CortexA8] Enter 3 ---> T0 EXIT
[CortexA8] Please enter ECC scheme type :
1
[CortexA8] Starting NETRA NAND writer
[CortexA8]
[CortexA8] ----------------------
[CortexA8] NAND FLASH DETAILS
[CortexA8] ----------------------
[CortexA8] Device ID : 0xca
[CortexA8] Manufacture ID : 0x2c
[CortexA8] Page Size : 2048 Bytes
[CortexA8] Spare Size : 64 Bytes
[CortexA8] Pages_Per_Block : 64
[CortexA8] Number_of_Blocks : 2048
[CortexA8] Device_width : 2 Byte
[CortexA8] DeviceSize : 256 MB
。。。。。。。。。
[CortexA8] Writing image data to Block 1 Page0x1f
[CortexA8] Writing image data to Block 1 Page0x20
[CortexA8] Writing image data to Block 1 Page0x21
[CortexA8] Image successfully flashed
[CortexA8]
[CortexA8]
[CortexA8] NAND flashing successful!
Uboot 烧写成功了，将开关SW3拨打到[0000010010],启动进入uboot后，我在uboot中输入 nand erase 会报错如下：
接着我又试了一下 save 环境变量，也报错了
然后，uboot的界面就一直在这里等待。无法其他操作。
我以为烧写错了uboot，于是我又擦除后，重新烧写了E:\my\sharedfiles\DVRRDK_03.00.00.00\pre_built_binary\ti816x_dvr\uboot_NAND_DM816X_EVM
但是，结果还是和上面的一样，这两条指令都有错误。
这是怎么回事呀？？求救
