下载bootloader擦出NAND FLASH出现如下错误，需更换flash才能用吗？

0 : offset 0x0
, size 0x40000

1 : offset 0x40000
, size 0x1c0000

2 : offset 0x200000
, size 0x600000

3 : offset 0x800000
, size 0x800000

4 : offset 0x1000000 , size 0x1000000

5 : offset 0x2000000 , size 0x2000000

Are you sure to erase nand flash from page 0x1000, block count 0x180 ?
.........................................................................................................................................................................................................................................................................................Press any key to continue..........................................................................................................Erase Nand partition completed with 1 bad block(s)
擦出后，在该分区下载根文件下载失败，启动失败；该分区能不能用，如果不能用该分区，应在哪修改启动参数，程序和目标文件都是人家的，现在想用它测试网口，同时也想从整体上了解整个下载过程？