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"ext2load mmc 0:6 0x40600000 /boot/uboot/pro_1.zIm; "
"ext2load mmc 0:6 0x40a00000 /boot/uboot/pro_1.dtb; "
"bootz 40600000 - 40a00000; "
run boot_pro
setenv ramboot 'run setup; setenv bootargs ${defargs} ${ramargs} ${setupargs} ${vidargs};run emmcdtbload; load mmc 0:1 ${kernel_addr_r} ${boot_file} && load mmc 0:1 ${ramdisk_addr_r} initramfs.cpio.gz.u-boot && bootm ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}'
Colibri iMX6 # setenv bootmode run ramboot
Colibri iMX6 # saveenv
http://developer.toradex.com/knowledge-base/linux-booting
mmcinit
ext2load mmc 0:2 0x31000000 uImage
bootm 0x31000000
What this does is tells U-Boot to first initialize the sd card reader, use the ext2load command to load from SD card 0, Partition 2 (the boot partition) the file uImage and store it at memory location 0x31000000, and then to finally use bootm to boot from memory location 0x31000000.
Now we need to set the bootargs variable.
setenv bootargs console=ttySAC0,115200 mini2440=1tb rootfstype=ext3 root=/dev/mmcblk0p3 rw rootwait
This tells u-boot to pass these options on to the kernel. Most importantly here is that your root device is partition 3 on the SD card, and that your filesystem time is ext3.
UPDATE: Please make sure you've added a rootwait or bootdelay=3 to the end of your bootargs. This allows the kernel to wait for the SD card to become available/visible to the kernel.
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