Rockchip platform use TPL to do the DRAM initialize for all the SoCs,
if TPL is not available, means no available DRAM init program, and the
u-boot-rockchip.bin is not functionable.
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Change-Id: I2299f1eddce5aa7d5fb1a3fb4d8aeaa995b397fa