HI3520D烧写UBOOT后无法启动，求高人？

     自己做的HI3520D的电路板，使用FastBoot3.1_BVT.exe进行烧写，偶尔才能够把u-boot_hi3520d_full .bin烧写成功一次。烧写后打印信息附后。烧写完成后，按复位键，开串口工具，输出一直为20 20 20 。。。 20 20 20 0A。这里有两个问题想请教一下:1,烧写跟什么有关，怎么偶尔才能够烧进呢？2，烧进UBOOT后，重启应该就可以连接SecureCRT作工作台来与3520做交互了，但为什么一直打印20 20 20 。。。 20 20 20 0A呢？
     板子硬件：                                                                                                                     
           SPI:MX25L25635F
           DDR:H5TQ2G63FFR-PBC
           选择4字节模式
     板子软件：
           SDK:Hi3520D_V100R001C01SPC010
           UBOOT:u-boot_hi3520d_full .bin
     烧写后的打印信息：

Partition Burning Started! Please power off and then power on the board.
Boot 100 % Downloaded.
Boot Downloading completed!

U-Boot 2010.06 (Apr 07 2013 - 16:16:41)

Check spi flash controller v350... Found
Spi(cs1) ID: 0xC2 0x20 0x19 0xC2 0x20 0x19
Spi(cs1): Block:64KB Chip:32MB Name:"MX25L25635E/735E/635F"

*** Warning - bad CRC, using default environment
In:    serial
Out:   serial
Err:   serial
start download process.
Boot Started successfully!
#
version: 3.0.3
(OK)
"getinfo version" command sent successfully!
spi
(OK)
"getinfo bootmode" command sent successfully!
Block:64KB Chip:32MB*1
ID:0xC2 0x20 0x19
Name:"MX25L25635E/735"
(OK)
"getinfo spi" command sent successfully!
getinfo - print hardware information

(ERROR)
Failed to send "getinfo nand" command!
32768 KiB hi_sfc at 0:0 is now current device
(OK)
"sf probe 0" command sent successfully!
Erasing at 0x10000 --   6% complete. Erasing at 0x20000 --  12% complete. Erasing at 0x30000 --  18% complete. Erasing at 0x40000 --  25% complete. Erasing at 0x50000 --  31% complete. Erasing at 0x60000 --  37% complete. Erasing at 0x70000 --  43% complete. Erasing at 0x80000 --  50% complete. Erasing at 0x90000 --  56% complete. Erasing at 0xa0000 --  62% complete. Erasing at 0xb0000 --  68% complete. Erasing at 0xc0000 --  75% complete. Erasing at 0xd0000 --  81% complete. Erasing at 0xe0000 --  87% complete. Erasing at 0xf0000 --  93% complete. Erasing at 0x100000 -- 100% complete.
(OK)
"sf erase 0 0x100000" command sent successfully!
#
Writing at 0x10000 --  33% complete.
Writing at 0x20000 --  66% complete.
Writing at 0x30000 -- 100% complete.
(OK)
"sf write 0x81000000 0 0x30000" command sent successfully!
Fastboot partition burnt successfully!
Partition Burning completed!!!

本人新接触HI3520这个芯片，望高人指点。严重求救！！