On Sun, 2022-01-23 at 09:40 -0500, gene heskett wrote: > On Friday, December 24, 2021 9:16:57 PM EST you wrote: > > On Thu, 2021-12-23 at 17:13 +0100, Sebastian Andrzej Siewior wrote: > > > Dear RT folks! > > > > > > I'm pleased to announce the v5.16-rc6-rt12 patch set. > > > > > Changes since v5.16-rc6-rt11: > > ... > > > > > - The "Memory controller" (CONFIG_MEMCG) can be enabled again. > > > > FWIW, LTP testcases pass on rpi4 and x86_64 boxen with no gripeage. > > Full LTP with maximally bloated config was as uninteresting as one can > > hope for. > > . > > Unforch and after many try's, I can't get it to reboot when installed, > sorta, on an rpi4b. > > I say sorta, because no matter how many times I rebuild it, the build > does not generate an arch/arm/boot/dts/overlays directory. The build > itself is error free. > > The raspi kernel build instructions from their somewhat dated wiki also > say to use the bcm2711_defconfig, but it does not now exist in a git > clone. And a hwinfo of the rpi4b says I should use the bcm2835_defconfig > for a starter .config. > > Is there any hope of making this work? Sure. Given bcm2711_defconfig is missing, sounds like you're trying to build patched up kernel.org source. You can do that, works fine for me, and I know jack diddly spit about cute little arm gizmos ;-) but you're better off patching up source from... git clone https://github.com/raspberrypi/linux.git ...instead, which has a large pile of not yet upstreamed rpi patches. Just checkout the rpi-5.16.y branch and apply the 5.16-rt patch set. There you'll find that bcm2711_defconfig you were looking for. I build on my desktop box, rpi4 being every bit as fast as you'd expect something that dinky to be, then nfs mount from rpi4 and sudo make modules_install dtbs_install install. Edit /boot/config.txt, reboot, and presto, you too will be ready to have any unrealistic x86_64 based expectations you may have thoroughly dashed by cyclictest numbers :) -Mike
