There are several branches of u-boot for Technexion product:
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tn-mx6-2013.10_3.0.35_4.1.0 (used for linux 3.0.35 kernel)
u-boot_2013.10(SPL) for i.mx6Solo/DL/Dual/Quad. Fork from mainline u-boot.
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tn-mx6-patches-2014.10_3.10.53_1.1.0_ga (used for linux 3.10.53 kernel)
u-boot_2014.10(SPL) for i.mx6Solo/DL/Dual/Quad. Fork from u-boot-fslc.
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tn-mx6SX-2014.04_3.10.53_1.1.0_ga (used for linux 3.10.53 kernel)
u-boot_2014.04 for i.mx6SoloX. Fork from Freescale u-boot-imx.
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tn-imx-v2015.04_3.14.52_1.1.0_ga (used for linux 3.14.52 kernel)
u-boot_2015.04(SPL) for i.mx6 Solo/DL/Dual/Quad/SoloX/UL and i.mx7. Fork from Freescale u-boot-imx.
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tn-imx-v2015.04_4.1.15_1.0.0_ga (used for linux 4.1.15 kernel)
u-boot_2015.04(SPL) for i.mx6 Solo/DL/Dual/Quad/SoloX/UL and i.mx7. Fork from Freescale u-boot-imx.