use esp8266 module over sdio on cubieboard as wifi card

    https://hackaday.io/project/8678-rpi-wifi-hat
    https://github.com/al177/esp8089

root@cubieboard:/home/dpavlin# cat mmc3-sdio.txt 
22 PI4 2 1 2 [mmc mmc3]                                SCD3_CMD
24 PI5 2 1 2 [mmc mmc3]                                SCD3_CLK
26 PI6 2 1 2 [mmc mmc3]                                SCD3_D0
28 PI7 2 1 2 [mmc mmc3]                                SCD3_D1
30 PI8 2 1 2 [mmc mmc3]                                SCD3_D2
32 PI9 2 1 2 [mmc mmc3]                                SCD4_D3

ESP-201

pinout from top

15 IO0                  13 IO15
14 IO2                  12 IO13
18 D2  GPIO9            10 IO12
21 CLK GPIO6            9  IO14
20 CMD GPIO11           8  XPD GPIO16
22 D0  GPIO7            7  CHIP_EN 
23 D1  GPIO8            32 RST
19 D3  GPIO10           6  TOUT ADC
16 IO4                  24 IO5
3.3V                    GND
3.3V                    GND


PE4   "132" => "PE4", -> CHIP_EN

root@cubieboard:/home/dpavlin/linux-gpio-pinout# modprobe esp8089 esp_reset_gpio=132 # PE4
[Sun Jun 30 19:19:24 2019] 
                           ***** EAGLE DRIVER VER:bdf5087c3deb*****

[Sun Jun 30 19:19:24 2019] ESP8089 reset via GPIO 132
[Sun Jun 30 19:19:35 2019] esp_sdio_init ------ RETRY ------ 
[Sun Jun 30 19:19:35 2019] ESP8089 reset via GPIO 132
[Sun Jun 30 19:19:35 2019] ESP8089 reset via GPIO 132
[Sun Jun 30 19:19:46 2019] esp_sdio_init ------ RETRY ------ 
[Sun Jun 30 19:19:46 2019] ESP8089 reset via GPIO 132
[Sun Jun 30 19:19:47 2019] ESP8089 reset via GPIO 132
[Sun Jun 30 19:19:58 2019] esp_sdio_init ------ RETRY ------ 
[Sun Jun 30 19:19:58 2019] ESP8089 reset via GPIO 132
[Sun Jun 30 19:19:58 2019] ESP8089 reset via GPIO 132
[Sun Jun 30 19:20:09 2019] esp_sdio_init ------ RETRY ------ 
[Sun Jun 30 19:20:09 2019] ESP8089 reset via GPIO 132
modprobe: ERROR: could not insert 'esp8089': No such device
[Sun Jun 30 19:20:10 2019] eagle sdio can not power up!