1How to use U-Boot on variscite DART-6UL Evaluation Kit
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4- Configure and build U-Boot for DART-6UL iMX6ULL:
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6    $ make mrproper
7    $ make variscite_dart6ul_defconfig
8    $ make
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10  This will generate SPL and u-boot-dtb.img images.
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12Boot from MMC/SD:
13- The SPL and u-boot-dtb.img images need to be flashed into the micro SD card:
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15    $ sudo dd if=SPL of=/dev/mmcblk0 bs=1k seek=1; sync
16    $ sudo dd if=u-boot-dtb.img of=/dev/mmcblk0 bs=1k seek=69; sync
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18- Boot mode settings:
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20  Boot switch position: SW1 -> 0
21			SW2 -> 0
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23Boot from eMMC:
24- if bootpart is not enabled by default, to enable under Linux
25	echo 0 >/sys/block/mmcblk1boot0/force_ro
26	mmc bootpart enable 1 1 /dev/mmcblk1boot0
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28- Flash the SPL and u-boot-dtb.img to mmcblk1boot0
29    $ sudo dd if=SPL of=/dev/mmcblk1boot0 bs=1k seek=1; sync
30    $ sudo dd if=u-boot-dtb.img of=/dev/mmcblk1boot0 bs=1k seek=69; sync
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32- Boot mode settings:
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34  Boot switch position: SW1 -> 0
35			SW2 -> 1
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37- Connect the Serial cable to UART0 and the PC for the console.
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39- Insert the micro SD card in the board and power it up.
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41- U-Boot messages should come up.
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