How to Recompile Linux (on a Raspberry Pi)

Because I get the same question on every video where I recompile the Linux kernel on a Pi to work on GPU or other hardware driver support, I finally made a video answering it:

How do you recompile Linux?

In my case, since I mostly rebuild the kernel for the Pi, I rebuild Raspberry Pi's Linux kernel fork instead of 'mainline' linux (the upstream Linux kernel source).

There are a couple great guides for recompiling Linux on the Pi:

• Jeff Geerling's cross-compile environment, with guides for compiling on a Pi, or from any other computer quickly, using a containerized build environment that's easy to set up on Mac, Windows, or Linux.
• Raspberry Pi's thorough guide for building and cross-compiling Linux, including how to compile 32-bit versions for older generations of Pi.

My video today mostly goes through that (with a few little tips on making the experience more convenient):

In the video, I also mention one practical reason I'm rebuilding the kernel currently is to work on Raspberry Pi (and more broadly, arm64) support for Intel Arc GPUs (I'm testing a B580 and A750 currently.)

And yes, the Raspberry Pi should support Resizable BAR, though we're trying to figure out why the Xe drivers aren't working correctly with it right now.