New: Unable to get I2C working on Raspberry-pi-5

https://bugs.busybox.net/show_bug.cgi?id=16120

            Bug ID: 16120
           Summary: Unable to get I2C working on Raspberry-pi-5
           Product: buildroot
           Version: 2024.05
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

Target Milestone: ---

excuse me for filing this as a bug, but i am not really sure where the issue is.
here is the problem description:

1) created sdcard.img using make raspberrypi5_defconfig
2) sdcard.img was written to micro-sdcard and able to boot the pi5 board
3) on pi5 console, ls /dev/i2c* did not show anything
4) on a running system, mounted /dev/mmcblk0p1 to /tmp/boot and added following lines to /tmp/boot/config.txt dtoverlay=i2c1,pins_2_3,baudrate=1000000
dtparam=i2c_arm=on
5) rebooted the board but /dev/i2c* didnt show anything
6) modified config.txt again with following changes but /dev/i2c* didnt show up.
dtoverlay=i2c1-pi5
dtparam=i2c_arm=on
7) when booting pi-5 with RaspberryPi-OS and enabling the i2c using sudo raspi-config shows up three nodes under /dev/i2c*

Any idea what am I missing here? has anyone managed to get i2c working on a buildroot generated image for pi-5? what changes did u do in your config.txt? Thanks.

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