Rockchip SRAM for pmu: ------------------------------ The sram of pmu is used to store the function of resume from maskrom(the 1st level loader). This is a common use of the "pmu-sram" because it keeps power even in low power states in the system. Required node properties: - compatible : should be "rockchip,rk3288-pmu-sram" - reg : physical base address and the size of the registers window Example: sram@ff720000 { compatible = "rockchip,rk3288-pmu-sram", "mmio-sram"; reg = <0xff720000 0x1000>; };