大家好：
之前sdk6.0的烧写，按照文档的描述已经得到验证，现在换sdk7.0版本参照Sitara Linux Program the eMMC on Beaglebone Black这个文档出现错误，log如下：
TFTP from server 192.168.100.1; our IP address is 192.168.100.2
Filename 'u-boot-restore.img'.
Load address: 0x807fffc0
Loading: ###########################
785.2 KiB/s
done
Bytes transferred = 390016 (5f380 hex)
U-Boot 2013.10-00189-g78d8ebd-dirty (Jan 19 2015 - 10:22:35)
I2C: ready
DRAM: 512 MiB
NAND: 0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
*** Error - No Valid Environment Area found
*** Warning - bad CRC, using default environment
Net: <ethaddr> not set. Validating first E-fuse MAC
cpsw, usb_ether
Hit any key to stop autoboot: 0
Card did not respond to voltage select!
mmc0(part 0) is current device
Scanning mmc 0...
Card did not respond to voltage select!
** Bad device mmc 0 **
Card did not respond to voltage select!
mmc0(part 0) is current device
Card did not respond to voltage select!
mmc1(part 0) is current device
SD/MMC found on device 1
Failed to mount ext2 filesystem...
** Unrecognized filesystem type **
** No partition table - mmc 1 **
Booting from nand ...
no devices available
no devices available
Bad Linux ARM zImage magic!
U-Boot# <INTERRUPT>
请各位帮帮忙，这个该怎么设置。
