Hi kim
difference between u-boot.imx and u-boot.bin is described in
u-boot.bin and u-boot.imx
https://github.com/Freescale/u-boot-fslc/blob/patches-2014.10/doc/README.imximage
for creating SD on your Linux host :
dd if=u-boot.imx of=/dev/mmcblk0 conv=notrunc seek=2 bs=512
Best regards
igor
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