Building Kernel from a custom .config with Buildroot

Question

I'm trying to generate a custom image for raspberrypi 3 with the usage of buildroot. I have a custom .config for Buildroot options where I give the path to BR2_KERNEL_CUSTOM_CONFIG_FILE which is located in /boards/raspberrypi3/linux.config

But in the patching stage of the build I find the following error:

for f in boards/raspberrypi3/.config ; do
    if [ ! -f "${f}" ]; then
        printf "Kconfig fragment '%s' for '%s' does not exist\n" "${f}" "linux";
        exit 1;
    fi;
done

Kconfig fragment

'boards/raspberrypi3/linux.config' for 'linux' does not exist
linux/linux.mk:555: recipe for target 'boards/raspberrypi3/.config' failed

When I only use the .config of buildroot without any path to a custom Linux Kernel config (using the default kernel in menuconfig) everything builds fine.

Please separate code/error and plain text, refer: stackoverflow.com/editing-help — Dani Vijay

Peter Korsgaard Peter Korsgaard · Accepted Answer · 2019-05-28T06:31:02

What is the correct file name for your linux configuration file? You mention that you point BR2_KERNEL_CUSTOM_CONFIG_FILE to /boards/raspberrypi3/linux.config (presumably without the leading slash), but your output snippet shows boards/raspberrypi3/.config?

The upstream location for raspberrypi 3 files is under board/raspberrypi3 (notice BOARD not BOARDS). Please double check

Building Kernel from a custom .config with Buildroot

1 Answers