u-boot 2016.11 and A33 1G ram detection.

Uboot reports 512Mb on my ET_Q8_V2.0 allwinner A33 tablet but it have 1G Ram (android and my eyes on pcb see it!), kernel(4.9-rc6) report 512Mb too.

Is ram autodetected or i can change something in dts(i suppose) to permit correct detection?

Uboot pass to kernel ram size or kernel detect itself ?

Thank