6410用自带u-boot SD启动，但uplooking # nand scrub 格式化不了。
琢磨了几天，把6410能在SD卡启动uplooking,但现在用自带的TQ6410_new_images/u-boot_TQ6410_movi_128MB_T43_V1.1.bin跑时，Format the Nand Flash格式化不了，情况如下：
##### Boot for SKY6410/TQ6410 Main Menu #####
##### EmbedSky USB download mode #####
Download u-boot or STEPLDR.nb1 or other bootloader to Nand Flash
Download Eboot (eboot.nb0) to Nand Flash
Download Linux Kernel (zImage.bin) to Nand Flash
Download LOGO Picture (logo.bin) to NandFlash
Download UBIFS image (root.ubi) to Nand Flash
Download YAFFS image (root.bin) to Nand Flash
Download Program to SDRAM and Run it
Boot the system
Format the Nand Flash
Set the boot parameters
Download User Program
Enter TFTP download mode menu
Reboot u-boot
Test Linux Image (zImage)
Enter your selection: 9
NAND format: device 0 whole chip
Really format this NAND flash? <y/n>
y
Erasing at 0x0 -- 0omplete.
Erasing at 0x280000 -- 1omplete.
Erasing at 0x500000 -- 2omplete.
Erasing at 0x7a0000 -- 3omplete.
Erasing at 0xa20000 -- 4omplete.
Erasing at 0xcc0000 -- 5omplete.
Erasing at 0xf40000 -- 6omplete.
Erasing at 0x11e0000 -- 7omplete.
Erasing at 0x1460000 -- 8omplete.
Erasing at 0x1700000 -- 9omplete.
Erasing at 0x1980000 --10omplete.
Erasing at 0x1c20000 --11omplete.
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