As far as I know, SES button, and the LEDS (red and blue) are not used by default, the Wifi LED is used to indicate Wifi ON/OFF. The SES button is the button on the right side of the unit. I have confirmed it using voltmeter and gpioctl command line tool. I found the GPIO pins from this posting by guidoa: This is what the PCB looks like from the back: Just note that you will use the 3.3V and GND for the SD card mod. Many guides are already available for connecting serial port (for example: here, here, here, and here), so I wont write about it. On the bottom right, you can connect a serial port (note: 3.3V, you will need MAX3232 or use a data cable from phone, don’t connect directly). This is what the front side of PCB looks like: Note that I already installed OpenWRT Kamikaze using the guide from: OpenWRT site. So here is a short guide to anyone who needs it. The difference is that there isn’t much guide about the hardware part (which GPIO pins to solder), and the software part (how to activate the drivers). This is not a difficult project, I already added SD/MMC card to my WRT54GL about 2,5 years ago. This weekend, I could have continued coding, but I don’t feel like coding, so I did a hardware project: adding serial port and SD card slot to my D-LINK DIR-300 that I bought April last year. I haven’t touched anything since then because I had to work on weekends at the office. The CNS21XX network driver and Hot-e network driver was completed. The latest progress of my freeBSD port for CNS21XX and ThinkLink Hot-e was three weeks ago.
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