Greetings rt-kernel-users; I managed to trace thru git.kernel.org until I found the above rebase. Downloaded it, moved it to the rpi4, and unpacked it. But to build it on an rpi4b for armhf, needs a bcm2711-defconfig, and it is not there in this tarball. The newest I have on site is dated Jan 20, 2020 from a 4.19.y tarball. I obviously got the wrong tarball, so where do I find the right tarball or git clone that will build on an rpi4b today? I have since found this one: <linux-stable-rt-d28ccbd42ce8c5b5d0b5f79160bfe0c5c98f9037.tar.gz> Is this the one I need? Thanks all. Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis