GL-XE300/i2c_firmware/README.md

OpenWRT 24.10.4 Firmware with GPIO I²C for GL.iNet XE300

Custom OpenWRT build enabling GPIO-based I²C master on the XE300 using i2c-gpio driver and clean DTS integration.

Locate & Edit DTS

target/linux/ath79/dts/qca9531_glinet_gl-xe300.dts

git clone https://git.openwrt.org/openwrt/openwrt.git cd openwrt git checkout v24.10.4 ./scripts/feeds update -a ./scripts/feeds install -a

Menu Config

Target System: Atheros ATH79 Target Profile: GL.iNet GL-XE300 Kernel Modules → I2C Support: kmod-i2c-core kmod-i2c-gpio Utilities → i2c-tools

make -j$(nproc)

Test It

ls /dev/i2c-* i2cdetect -y 0 cat /sys/kernel/debug/gpio i2cdump -y 0 0x48 # Adjust address accordingly

Notes

• ✅ If you connect the resistors after boot, bus works great (ADS1115 detected at 0x48).
• ✅ Reboots are fine — problem only occurs on cold boot / full power cycle.
• ✅ The ADS1115 can be powered before boot or after — no issue.
• ❌ The presence of 3.3V on SDA/SCL at boot causes the SoC to hang.

Ubuntu 22.04+ build tools:

sudo apt update && sudo apt install -y \
  build-essential clang flex bison g++ gawk gcc-multilib \
  g++-multilib gettext libncurses-dev libssl-dev python3 \
  python3-pip rsync unzip zlib1g-dev file wget git