Version magic issue for compiling kernel module when passing in another version of Linux kernel about freedom-u-sdk HOT 1 CLOSED

The solution is as follows:

1. Download Linux kernel source, check out any version you want
2. Add the kernel module to /drivers directory to eliminate the need of compiling it as an out-of-tree kernel module. Detailed steps could be found here: https://stackoverflow.com/questions/11710022/adding-new-driver-code-to-linux-source-code.
3. The link above targets ARM, not RISCV, so needs to change ARM to RISCV. The link above also mentions you need to modify kernel_source/arch/arm/configs/--defconfig, it just means the file with defconfig as suffix. So you could simply modify the file kernel_source/arch/riscv/configs/defconfig to set CONFIG_YOUR_DRIVER=y.
4. Re-compile the kernel source, and pass the generated Image file to -kernel option to QEMU, then run QEMU.
5. The kernel module will be automatically loaded had there been a device supported. Don't forget to mknod as what you would normally do after insmod when dealing with out-of-tree kernel modules.

from freedom-u-sdk.