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* ram: px30: add sdram driverYouMin Chen2019-11-171-0/+73
Add the sdram driver for PX30 to support ddr3, ddr4, lpddr2 and lpddr3. For TPL_BUILD, the driver implement full dram init and without DM support due to the limit of internal SRAM size. For SPL and U-Boot proper, it's a simple driver with dm for get dram_info like other SoCs. Signed-off-by: YouMin Chen <cym@rock-chips.com> Signed-off-by: Kever Yang <kever.yang@rock-chips.com>