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书上第一个实验我的超级终端显示的不太对

U-Boot 2011.03-dirty (Jul 11 2012 - 16:07:00)

DRAM: 512 MiB
MMC: SDHCI: 0
Using default environment

In: serial
Out: serial
Err: serial
Net: zynq_gem
Hit any key to stop autoboot: 0
Copying Linux from SD to RAM...
Device: SDHCI
Manufacturer ID: 27
OEM: 5048
Name: SD04G
Tran Speed: 25000000
Rd Block Len: 512
SD version 1.10
High Capacity: Yes
Capacity: 3980394496
Bus Width: 1-bit
reading zImage

** Unable to read "zImage" from mmc 0:1 **
reading devicetree_ramdisk.dtb

** Unable to read "devicetree_ramdisk.dtb" from mmc 0:1 **
reading ramdisk8M.image.gz

** Unable to read "ramdisk8M.image.gz" from mmc 0:1 **
## Starting application at 0x00008000 ...

请问有没有懂的大神帮忙解答一下呢？小弟初学