Один из ресурсов, посвящённый .img образам для SoC - готовым и технике их сборки, ресурс и образы, которые сильно хвалят по Интернет, это:
Supported chips
Allwinner A10, A20, A31, H2+, H3, H5, A64
Amlogic S805 and S905 (Odroid boards), S802/S812, S805, S905, S905X and S912 (fork by @balbes150)
Actionsemi S500
Freescale / NXP iMx6
Marvell Armada A380
Rockchip RK3288
Samsung Exynos 5422
Supported boards
Beelink X2, Orange Pi PC plus, Orange Pi Plus 2E, Orange Pi Lite, Roseapple Pi, NanoPi M1, NanoPi M1+, NanoPi Neo, NanoPi Neo2, NanoPi Duo, Le Potato, Espressobin, Pine64, soPine64, Pinebook A64, pcDuino2, pcDuino3, Odroid C0/C1/C1+, Banana Pi M2+, Hummingboard 2, Odroid C2, Orange Pi 2, Orange Pi One, Orange Pi PC, Orange Pi PC2, Orange Pi Prime, Orange Pi Win, Orange Pi Plus 1 & 2, Clearfog, Lemaker Guitar, Odroid XU4, Odroid HC1, Udoo Neo, Banana Pi M2, Orange Pi A31S, Cubieboard 1, Cubieboard 2, Hummingboard, Lamobo R1, Banana Pi PRO, Orange Pi mini A20, Olimex Lime A10, Olimex Micro, Olimex Lime 2, pcDuino3 nano, Banana Pi Plus A20, Udoo quad, Orange Pi A20, Olimex Lime 1, Banana Pi, Cubox-i, Cubietruck, Tinker Board, Miqi, Rock64