thanks for your response.I’m using the milkv-duo-buildroot repo instead of duo-buildroot-sdk as the SDK version produces nearly 1G sdcard image and I was unfamiliar with it’s custom build system… Unfortunately the cvi_pinmux application used here Milk-V Duo 引脚复用配置工具 cvi_pinmux is not included in the repo I’m using and I was also unable to download it manually. So I was not able to confirm if the pinmux was in GPIO state or alternate function as this could have been the issue I’m facing. I was unable to progress further. As I’m relatively new to embedded Linux all this complexity with this board and I have switched to another ARM board to continue my experiments.