Hardware/802.11 Wireless

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802.11 Wireless
Access
BroadwayNone
StarletFull
Registers
Base0x0d080000
Length0x200
Access sizeunknown/32[check] bits
Byte orderReversed Little Endian
IRQs
Hollywood8[check]
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The wireless hardware on the Wii is a BCM4318-based daughterboard that connects to the Hollywood via an internal SDIO bus. Information on this device is scarce.

See http://www.gc-linux.org/wiki/Wii:WLAN for additional information.

IOS's WL driver contains a lot of code that matches up with the code in the Android broadcom.git repo, specifically bcmsdh.c and bcmsdstd.c. That driver, combined with the knowledge that the BCM4318 is connected to the Hollywood via a standard SDHC at 0x0d080000, is probably enough to get WiFi working.

Pinout

WiFi module pinout on the daughterboard[1][2]
Pin Name
1 GND
2 Data 2
3 Data 1
4 GND
5 CLK
6 GND
7 GPIO 1 (unused)
8 GND
9 1.8V
10 1.8V
11 3.3V
12 3.3V
13 GND
14 GPIO 0 (unused)
15 GND
16 Data 3
17 Data 0
18 GND
19 CMD
20 GND

References

1. "WiFi Module Pinout". https://bitbuilt.net/forums/index.php?threads/wifi-module-pinout.1035/. 
2. "BCM4318/BCM4318E AirForce One™ Chip 802.11g MAC/Baseband/Radio Preliminary Data Sheet". http://www.cypress.com/file/299516/download.