Cant SDboot on tiny210v2

follow the instructions i burn superboot on SD card copy images on card in
"images" directory set "SDBOOT" and power on...and nothing happens! Screen
is white buzzer off in console no any symbols.

But when i set "NANDBOOT" i see in console normal boot progress

What am I doing wrong?

i solved the problem!
http://yamolodoi.ru/blogs/blog-utkonosa/tiny210v2-booting-problem.html

Hi Neo Chapay,
I also have the same problem as you. I tried already to had a empty disk
area, but the problem persists.