# Linux Kernel Module Cheat

##### 17.1.3.1. About Buildroot’s kernel configs

To see Buildroot’s base configs, start from `buildroot/configs/qemu_x86_64_defconfig`.

That file contains `BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86_64/linux-4.15.config"`, which points to the base config file used: board/qemu/x86_64/linux-4.15.config.

`arm`, on the other hand, uses `buildroot/configs/qemu_arm_vexpress_defconfig`, which contains `BR2_LINUX_KERNEL_DEFCONFIG="vexpress"`, and therefore just does a `make vexpress_defconfig`, and gets its config from the Linux kernel tree itself.

- Linux kernel defconfig

- Linux kernel min config