I am trying to build Debian image for microSD card manually, by executing instruction from https://www.olimex.com/wiki/RK3188-SOM step by step.
And unfortunately stuck on "Booting from SD-card" :(.
Where to get or better how to build sdboot_rk3188.img and parameter.img files?
Maybe from here: http://androtab.info/radxa_rock/sdboot/