使用uniflash烧写nand，restore已经运行起来，下载flash-image.out完成后，出现如下信息：
########################################################
438.5 KiB/s
done
Bytes transferred = 75239424 (47c1000 hex)
Got Flash Image
NAND write: incorrect device type in NAND.SPL
MLO Programming Failed... error exit
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC f4:5e:ab:58:90:2c
HOST MAC de:ad:be:af:00:00
RNDIS ready
high speed config #2: 2 mA, Ethernet Gadget, using RNDIS
USB RNDIS network up!
Using usb_ether device
TFTP from server 192.168.100.1; our IP address is 192.168.100.27
Filename 'TargetProgrammingError:f4:5e:ab:58:90:2c'.
Load address: 0x80001000
Loading: T
TFTP error: 'File not found or No Access' (1)
Not retrying...
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC f4:5e:ab:58:90:2c
HOST MAC de:ad:be:af:00:00
RNDIS ready
high speed config #2: 2 mA, Ethernet Gadget, using RNDIS
USB RNDIS network up!
Using usb_ether device
TFTP from server 192.168.100.1; our IP address is 192.168.100.27
Filename 'TargetErrorExit:f4:5e:ab:58:90:2c'.
Load address: 0x80001000
Loading: T
TFTP error: 'File not found or No Access' (1)
Not retrying...
Halting processor.....
## Starting application at 0x0002001C ...
请问这是什么原因呢？
