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This article mainly introduces how to configure the RK3399 android7.1 DTS clock, the article is very detailed, has a certain reference value, interested friends must read it!

RK3399's CPU adopts big.LITTLE large and small core architecture, double Cortex-A72 large core + four Cortex-A53 small core structure, greatly optimizes integer, floating point, memory, etc., and revolutionizes the overall performance, power consumption and core area. RK3399's GPU uses a new generation of quad-core ARM high-end image processor Mali-T860, integrates more bandwidth compression technologies such as intelligent superposition, ASTC, local pixel storage, etc., and supports more graphics and computing interfaces, with an overall performance improvement of 45% over the previous generation.

The RK3399 Android motherboard newly developed by Ying Pengfei Technology is equipped with the latest android7.1 system, 4G DDR3 memory, 32G EMMC memory and so on. RK3399 development board size: 146*102mm, designed with very rich interfaces, on-board 5-channel UART, support USB3.0 high-performance device interface, WIFI/BT two-in-one, HDMI OUT, HDMI INT, Type C, 4G, IR, Ethernet, etc. The expandable module includes 4G module, Camera (13 million, 5 million) and other application function modules.

RK3399 Android motherboard is designed for the application development of consumer electronics, intelligent terminals, MID, wireless communications, medical equipment, industrial control and other industries, with strong video processing capabilities, ultra-high definition video output advantages, rich interfaces and stable performance. Support Android\ Linux\ Ubuntu system, perfect software support, open source code suitable for the secondary development of commercial display advertising machines with high-definition display, self-service vending machines, educational terminals, etc., can reduce the threshold of research and development, shorten the product development cycle.

DTS configuration

Clock configuration

The clock of CPU has been configured in DTSI, and there is a Clocks attribute under each CPU node. The specific name is determined by the CRU module, and different platforms have different names. Take RK3399 as an example, the header file dt-bindings/clock/rk3399-cru.h defines large core A72 as ARMCLKB and small core A53 as ARMCLKL. So you can see the following configuration in rk3399.dtsi

Ying Pengfei embedded focuses on the research and development of Atmel, TI, NXP, Rockchip and other platform products. The company team has more than 10 years of ARM software and hardware development experience, and has many successful cases such as smart home, man-machine interface, industrial sewing machine, power collector and so on. Since its establishment in 2005, the company has been mainly engaged in the development of industrial control fields. it has successively developed various schemes controlled by ARM9- AT91SAM9G45, Cortex-A8-335x, A7-i.MX6UL and A9-I.MX6Q, and has gone deep into WINCE/LINUX embedded system development for many years. The products have won the trust of customers with high stability and high reliability. In 2017, we set out again, relying on many years of design attainments in the field of industrial control, the company to create "core" technology, smart to create win-win business philosophy, has developed RK3288, RK3399 and other processors as the application of ANDROID solutions, to undertake project customization, BSP and APP development, to provide customers with professional customized advertising machines, consumer electronics and other solutions.

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