Trendnet TEG-S750

This 5 Port 10G switch supports IEEE 802.3bz NBASE-t and has a maximum power consumption of 12W.

SOC: RTL9303
RAM: 256MB, Nanya NT5CC128M16JR-EK
Flash: 16MB, Macronix MX25L12833F 3.3V
UART pin order: VCC (square), RX, GND, TX

Getting a shell

pyserial-miniterm --eol LF --raw /dev/cu.usbserial-* 115200

Flash and run OpenWrt:

pip install pyserial xmodem
python3 ymodem.py /dev/cu.usbserial-* openwrt-realtek-rtl930x-zyxel_xgs1250-12-initramfs-kernel.bin

GPIO

489 = system (green)
490 = system (orange)
491 = port 2 act (green, active low)
492 = port 3 act (green, active low)
493 = port 4 act (green, active low)
494 = port 5 act (green, active low)
495 = port 1 act (green, active low)

Script:

#!/bin/sh
GPIOCHIP=488
BASE=$(cat /sys/class/gpio/gpiochip${GPIOCHIP}/base)
NGPIO=$(cat /sys/class/gpio/gpiochip${GPIOCHIP}/ngpio)
max=$(($BASE+$NGPIO))
gpio=$BASE
while [ $gpio -lt $max ] ; do
	echo $gpio > /sys/class/gpio/export
	[ -d /sys/class/gpio/gpio${gpio} ] && {
		echo out > /sys/class/gpio/gpio$gpio/direction

		echo "[GPIO$gpio] Trying value 0"
		echo 0 > /sys/class/gpio/gpio$gpio/value

		while read -n1 c; do
			if [[ $c == "t" ]]; then
				oldVal=$(cat /sys/class/gpio/gpio$gpio/value)
				newVal=$((oldVal ^= 1))
				echo "[GPIO$gpio] Trying value $newVal"
				echo $newVal > /sys/class/gpio/gpio$gpio/value
			else
				break
			fi
		done
 
		echo $gpio > /sys/class/gpio/unexport
	}
	gpio=$((gpio+1))
done

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