[U-Boot] booting from sd card problem

[shobin b]

Hi,  I am using uboot-toradex in my iris carrier with colibri t30 module.In that when i am booting from sd card it is showing following error,

U-Boot 2011.06-00004-gccd521c (Mar 17 2014 - 09:48:16)                                                                                                                                TEGRA3                                                                                     DRAM:  1 GiB                                                                               MMC:   Tegra2 SD/MMC: 0, Tegra2 SD/MMC: 1mmc_reset: power control = 0F, host control = 00Board: Toradex Colibri T30Net:   Net Initialization SkippedNo ethernet found.Hit any key to stop autoboot:  0 Colibri T30 # run sdbootLoading kernel and rootfs from MMC/SD Card...mmc_reset: power control = 0F, host control = 00mmc1 is current deviceGUID Partition Table Header signature is wrong:0xE1A0000DEA000002 != 0x5452415020494645get_partition_info_efi: *** ERROR: Invalid Primary GPT ***Loading file "/boot/uImage" from mmc device 1:1 (gpt1)GUID Partition Table Header signature is wrong:0xE1A0000DEA000002 != 0x5452415020494645get_partition_info_efi: *** ERROR: Invalid Primary GPT ***4324368 bytes read## Booting kernel from Legacy Image at 80408000 ...   Image Name:   Linux-3.1.10   Image Type:   ARM Linux Kernel Image (uncompressed)   Data Size:    4324304 Bytes = 4.1 MiB   Load Address: 80008000   Entry Point:  80008000   Loading Kernel Image ... OKOK  what was the problem? please help me.
In my board environment variables are following,
Colibri T30 # prbaudrate=115200bootcmd=run emmcboot; run usbboot; run nfsbootbootdelay=3defargs=core_edp_mv=1300 usb_high_speed=1emmcboot=run setup; setenv bootargs ${defargs} ${mmcargs} ${setupargs} ${vidargs}; echo Booting from internal eMMC chip...; mmc read ${loadaddr} ${lnxmethaddr=00:14:2d:26:0b:9bfdtaddr=8014d538gptoffset=0xa001ipaddr=192.168.10.2lnxoffset=0x5000loadaddr=0x80408000memargs=vmalloc=128M mem=1012M at 2048M fbmem=12M at 3060Mmmc_kernel_size=0x4000mmcargs=ip=off root=/dev/mmcblk0p1 rw,noatime rootfstype=ext3 rootwaitnetmask=255.255.255.0nfsargs=ip=:::::eth0:on root=/dev/nfs rw netdevwaitnfsboot=run setup; setenv bootargs ${defargs} ${nfsargs} ${setupargs} ${vidargs}; echo Booting via DHCP/TFTP/NFS...; usb start && dhcp && bootmsdargs=ip=off root=/dev/mmcblk1p1 rw,noatime rootfstype=ext3 rootwaitsdboot=run setup; setenv bootargs ${defargs} ${sdargs} ${setupargs} ${vidargs}; echo Loading kernel and rootfs from MMC/SD Card...; mmc dev 1 && ext2l}serverip=192.168.10.1setup=setenv setupargs gpt gpt_sector=${gptoffset} asix_mac=${ethaddr} no_console_suspend=1 console=tty1 console=ttyS0,${baudrate}n8 debug_uartport=ls}stderr=serial,lcdstdin=serial,usbkbdstdout=serial,lcdusbargs=root=/dev/sda2 rw,noatime rootwaitusbboot=run setup; setenv bootargs ${defargs} ${setupargs} ${usbargs} ${vidargs}; echo Booting from USB stick...; usb start && fatload usb 0:1 ${loadamverify=novidargs=video=tegrafb0:640x480-16 at 60
Environment size: 1625/4092 bytesColibri T30 # 

please give me a solution.
regards,shobin.b