请教dataflash无法写入内核文件，高手帮忙啊！

BerthaV

dataflash芯片采用AT45DB642；
采用SAM_BA烧写程序的时候发现这样的问题；

擦除整个flash没有问题：
I- === Erase all the DataFlash blocs and test the erasing ===
-I- Erasing: 0x80E80 bytes at address 0x0
-I- Erasing: 0x80E80 bytes at address 0x80E80
-I- Erasing: 0x80E80 bytes at address 0x101D00
-I- Erasing: 0x80E80 bytes at address 0x182B80
-I- Erasing: 0x80E80 bytes at address 0x203A00
-I- Erasing: 0x80E80 bytes at address 0x284880
-I- Erasing: 0x80E80 bytes at address 0x305700
-I- Erasing: 0x80E80 bytes at address 0x386580
-I- Erasing: 0x80E80 bytes at address 0x407400
-I- Erasing: 0x80E80 bytes at address 0x488280
-I- Erasing: 0x80E80 bytes at address 0x509100
-I- Erasing: 0x80E80 bytes at address 0x589F80
-I- Erasing: 0x80E80 bytes at address 0x60AE00
-I- Erasing: 0x80E80 bytes at address 0x68BC80
-I- Erasing: 0x80E80 bytes at address 0x70CB00
-I- Erasing: 0x80E80 bytes at address 0x78D980
-I- Erasing: 0x80E80 bytes at address 0x80E800


烧写u-boot.bin也没有问题，uboot为156K
GENERIC::SendFile u-boot-1.3.4-exp.4-at91sam9g20ek_2mmc-dataflash_cs1.bin at address 0x8400
-I- File size : 0x270AC byte(s)
-I- Writing: 0x270AC bytes at 0x8400 (buffer addr : 0x20002A70)
-I- 0x270AC bytes written by applet

但是烧写内核文件的时候，SAM_BA就卡死了
GENERIC::SendFile uImage-2.6.30-r1-at91sam9g20ek_2mmc.bin at address 0x42000
-I- File size : 0x1A3534 byte(s)
-I- Writing: 0x80E80 bytes at 0x42000 (buffer addr : 0x20002A70)
内核文件比较大，1.6M左右，需要分块的写入，但是每到这里就卡死了

是硬件的问题还是dataflash.bin对芯片的没有正确初始化啊？
高手帮忙啊，救命啊，郁闷死了。。。。