commit 5db9e670d828f96b62c3a431f78f31cbd661c4ec
author Kever Yang <kever.yang@rock-chips.com> Fri Jun 23 16:11:05 2017 +0800
committer Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Tue Jul 11 12:13:44 2017 +0200
tree 8fed22118f9c2cf46b305db9159ca9b984166c9a
parent 6cd0cab10addcd60cfeb728c8ef791bf88de1669

rockchip: add sdram_common for common functions

There are some functions like sdram_size_mb can be re-used for
different rockchip SoCs, just put them into common file.
Add board_get_usable_ram_top() for ram_top init base on
SDRAM_MAX_SIZE.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Added SDRAM_MAX_SIZE definition for RK3036:
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

fixup: 3036 fix for sdram_common