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WiFi.md

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WiFi

Xassette-Asterisk supports SDIO Wi-Fi module since hw v0.2. The module is connected to SoC via sdc2 which shares pins with SPI flash, thus the flash won't be available when Wi-Fi module is in use.

Module Selection

Due to the limited area of PCB, there is no onboard antenna for the module. Thus the module must have an IPEX socket to connect external antenna. RTL8189ftv is the module used to test the Wi-Fi functionality, and it will be the example for the following sections.

Kernel Configuration

To enable the sdc2 interface as SDIO card controller, the board device tree must configure sdc2 as below:

&sdc2 {
        non-removable;
        bus-width = <4>;
        no-mmc;
        no-sd;
        cap-sd-highspeed;
        cap-sdio-irq;
        keep-power-in-suspend;
        ignore-pm-notify;
        max-frequency = <150000000>;
        ctl-spec-caps = <0x308>;
        status = "okay";
};

and the no-sdio property must be removed from the sdc2 node in chip's device tree (sun20iw1p1.dtsi).

After this, the SD card will probably be probed as mmcblk1 (originally mmcblk0) and causes the VFS fail to mount the root partition. Changing the path of root (in bootargs) in u-boot solves the problem.

The firmware image with configuration supports Wi-Fi is available in release. It can be flashed to the card following Quick Start.

Driver

Driver for RTL8189ftv can be compiled following sunxi WiKi. This driver is included in the firmware mentioned above. Load it with

insmod 8189fs

and the module is ready to work.