zedboard bootup from sdimage

gistfile1.txt

zynq-uboot> boot
Device: zynq_sdhci
Manufacturer ID: 3
OEM: 5344
Name: SE32G 
Tran Speed: 50000000
Rd Block Len: 512
SD version 3.0
High Capacity: Yes
Capacity: 29.7 GiB
Bus Width: 4-bit
reading uEnv.txt
297 bytes read in 8 ms (36.1 KiB/s)
Loaded environment from uEnv.txt
Importing environment from SD ...
Running uenvcmd ...
Copying Linux from SD to RAM...
reading uImage
3232864 bytes read in 285 ms (10.8 MiB/s)
reading zedboard-zynq7.dtb
24058 bytes read in 16 ms (1.4 MiB/s)
## Booting kernel from Legacy Image at 03000000 ...
   Image Name:   Linux-3.14.2-xilinx
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    3232800 Bytes = 3.1 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... Bad Data CRC
ERROR: can't get kernel image!
Copying Linux from SD to RAM...
reading uImage
3232864 bytes read in 285 ms (10.8 MiB/s)
reading zedboard-zynq7.dtb
24058 bytes read in 16 ms (1.4 MiB/s)
reading uramdisk.image.gz
** Unable to read file uramdisk.image.gz **