U-BOOT无法擦除FLASH特定扇区

:0wl;l1 选用AT91RM9200DK的开发板，FLASH芯片E28F128，在UBOOT命令操作时发现无法擦除10380000~1039ffff的扇区，其它均正常；在自己做的板子上是0扇区无法擦除，换了FLASH芯片后情况完全一样:
Uboot> protect off all

Un-Protect Flash Bank # 1
Uboot> erase 10000000 1001ffff


Erasing sector 0 ... done
Erased 1 sectors
Uboot> md 10000000

10000000: 08400060 093cffff 2935fe00 09012440 `.@...<...5)@$..
10000010: 88400060 08000244 08311000 00150300 `.@.D.....1.....
10000020: 00000000 f00b3c05 00000000 083c00b0 .....<........<.
10000030: 098d0403 29310100 20110f00 00000000 ......1)... ....
10000040: 098d4402 2a310400 40110300 00000000 .D....1*...@....
10000050: 09240200 09ad4402 098d5402 2a310400 ..$..D...T....1*
10000060: 40111500 00000000 09240200 09ad5402 ...@......$..T..
10000070: 00101100 00000000 098d1000 29310200 ..............1)
10000080: 2011e303 00000000 098d0403 2931c003 ... ..........1)
10000090: 20110300 00000000 0010dd03 00000000 ... ............
100000a0: 098d1c00 29310080 20110600 00000000 ......1)... ....
100000b0: 0010d703 00000000 04248813 f00f8d06 ..........$.....
100000c0: 00000000 f00b3c05 00000000 00000000 .....<..........
100000d0: 00000000 00000000 00000000 00000000 ................
100000e0: 00000000 00000000 00000000 00000000 ................
100000f0: 00000000 00000000 00000000 00000000 ................
Uboot>
采用的是开发板公司提供的U-BOOT1.1.1的程序，是uboot的问题还是FLASH的问题？还是别的原因？应该怎么解决？