Today, I am also having similar issue with legacy jessie image, where it appears U-Boot works, but at the point it starts to load the kernel the board powers off.
The vanilla image works fine, but I would like to use the NAND, so at the moment I must use legacy kernel.
This board has been working fine for a long time with Cubian, which appears no longer alive, hence coming over to Armbian.
Any advice on what I should or could try ?
I also have just recently a new Olimex LIME2 with 7" LCD, works great with vanilla, haven't tried legacy on this board.
Igor and friends, you are total wizards, I really appreciate your work, Najlepša hvala
Regards from the island of Tasmania, down under.
Paul