出現了這種現像：看別人的貼子搞一下：nand scrub
還有救。先用 nand scrub 把整片擦除一遍就好了。
nand scrub 後問題解決了,謝了哈
什麼是nand scrub?
強制擦除，不管好塊壞塊
這個對Nand 有損壞嗎？
減少Nand塊壽命一次寫吧.
NAND出廠前會把壞塊標識出來，nand scrub命令會擦掉這些標識，這會導致把壞塊當好塊使用，這是不安全的。不過作為開發板，本來就是用來嘗試解決問題、發生錯誤、解決錯誤的，我經常nand scrub。
Skipping bad block at 0x011a0000
Skipping bad block at 0x011c0000
Skipping bad block at 0x011e0000
Skipping bad block at 0x01200000
Skipping bad block at 0x01220000
Skipping bad block at 0x01240000
Skipping bad block at 0x01260000
Skipping bad block at 0x01280000
Skipping bad block at 0x012a0000
Skipping bad block at 0x012c0000
Skipping bad block at 0x012e0000
Skipping bad block at 0x01300000
Skipping bad block at 0x01320000
Skipping bad block at 0x01340000
Skipping bad block at 0x01360000
Skipping bad block at 0x01380000
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