On Tue, Jan 10, 2017 at 03:55:15PM +0800, Chen Feng wrote: > + memory@0 { > + device_type = "memory"; > + reg = <0x0 0x00400000 0x0 0xbfe00000>; > + }; The unit-address here is incorrect. The base address of this memory is not zero. > + timer { > + compatible = "arm,armv8-timer"; > + interrupt-parent = <&gic>; > + interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>, > + <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>, > + <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>, > + <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>; > + clock-frequency = <1920000>; > + }; This clock-frequency property should not be required; please remove it. Your FW should program CNTFRQ_EL0 with the timer frequency. Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html