Enable I2C On RPI 4B With OpenMANET WRT 1.4.0

[alwitt]

Hi,

Would anyone know how to enable I2C on raspberry pi 4B with OpenWRT 1.4.0 release?

I am currently trying to enable I2C on the RPI 4B to interface with the Waveshare UPS boards.

I am following the instruction from OpenWRT website, Using I2C and SPI. However, when I attempt to install the additional kernel module

opkg update
opkg install kmod-i2c-bcm2835

I get the error

root@rpi-halow-00:~# opkg install kmod-i2c-bcm2835
Unknown package 'kmod-i2c-bcm2835'.
Collected errors:
 * pkg_hash_check_unresolved: cannot find dependency kernel (= 5.15.167-1-ff3c8e5d13ba51d6e12024010af1a071) for kmod-i2c-bcm2835
 * pkg_hash_fetch_best_installation_candidate: Packages for kmod-i2c-bcm2835 found, but incompatible with the architectures configured
 * opkg_install_cmd: Cannot install package kmod-i2c-bcm2835.

opkg has an option to install a package while ignoring the dependencies. Should I use that option?

I have updated /boot/config.txt with

[all]
# Place your custom settings here.
dtparam=i2c_arm=on
dtparam=i2c1=on

But I don't see any additional I2C devices in /dev/. The only I2C related kernel module enabled is

root@rpi-halow-00:~# lsmod | grep -i 'i2c'
i2c_dev                20480  0

Any help will be much appreciated. Thank you.

[alwitt]

Finally gotten around to taking another look at this.

When I built the OpenWRT image locally, the output DIR bin/target/<platform>/<target>/, actually contains the module kmod-i2c-bcm2835. After copying the module over and installing, I2C controllers now show up in /dev.