Shulou(Shulou.com)06/02 Report--

This article will explain in detail what matters needing attention about RK3399 android7.1 wifi compatible hardware and software, the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

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.

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.

Considerations for RK3399 android7.1 wifi compatibility with hardware and software

The currently released SDK firmware is compatible with sdio2.0 and sdio 3.0 wifi. The sdio2.0 clk maximum run 50m Magi Sdio 3.0 clk top run 150Mwifi automatic compatibility solution can achieve a set of firmware compatible with multiple wifi, especially note: SDIO wifi io reference voltage, sdio2.0 wifi and sdio 3.0 wifi have the following two choices in hardware design: (the first reference design is highly recommended)

1. The board shape of hardware for dynamic design of sdio wifi

In other words, the wccio_wl module that supports sdio3.0 wifi is 1.8v, and the wifi module wccio_wl that supports sdio2.0 is 3.3v.

two。 The wccio_wl of all wifi on hardware is 1.8v, but the kernel software needs to be modified as follows (note the red font):

Kernel/drivers/mmc/host/rk_sdmmc.c void dw_mci_sdio_switch_iovel (struct mmc_host * mmc, int enable) {struct dw_mci_slot * slot = mmc_priv (mmc); struct dw_mci * host = slot- > host; const struct dw_mci_rockchip_priv_data * priv = host- > priv Switch (priv- > ctrl_type) {case DW_MCI_TYPE_RK322XH: regmap_write (host- > grf, RK322XH_GRF_SOC_CON4,-(enable)

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