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*Blush* I'll see what I can do to help. Maybe a week before I can.

OK. That is awesome!! One problem, I can't find KERNELBRANCH documented :-(

The only places I am *aware* that I had changed files were: build/config/kernel/linux-sunxi-next.config (and then reverted) build/patches/sunxi* (renamed to & from .disabled) build/userpatches/ cache/sources/linux-mainline/ I'm not saying that these are definitely the only files that I changed, only the ones that I can remember. colin@ArmbianDev:~/Armbian/build$ git status didn't flag anything either. However, all that aside, checking out an entire new build env from your github repo fixed all the errors for my basic build. ./compile.sh BOARD=nanopiair BRANCH=next LIB_TAG=sunxi-4.14 KERNEL_ONLY=yes KERNEL_CONFIGURE=yes works flawlessly However, I want a real-time sunxi-next kernel. The latest 4.14 RT patch that I can find at https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/4.14/ is patch-4.14.52-rt34.patch. Is there any way that I can convince the compile script to only download 4.14.52, not 4.14.58?

Yep, Read that and tried LIB_TAG="sunxi-4.14" but that stilled wanted to use 4.17. I have since renamed my build directory, and started from scratch cloning your build environment again, and that seems to be working. Obviously, my local directory got corrupted. I'll let you know how the build goes.

Officially, how do I convince my build environment that I still want to use 4.14? When I just ./compile.sh BOARD=nanopiair BRANCH=next it defaults to 4.17 What I have come up with is: git checkout sunxi-4.14 && touch .ignore_changes This results in a lot of patches failing What is the correct way please?

So I found the answers to my questions: My experience says that only step 2 is required. Where did I go wrong?? I didn't read @arre's wonderful blog (http://arre234.blogspot.com/2018/02/linux-portable-wifi-guitar-amp-on.html) properly. He clearly states in his earlier post in this thread : In the blog post he details how he resolved these issues. Setting the scaling governor to userspace, and specifying the freq and speed resolved my issues. I still need to investigate how to remove the operation points from the device tree, but that should just be a little searching and reading.

So I am a NOOB to RT, and it has been a few years since I compiled a kernel I am trying to compile PREEMPT RT for NanoPi NEO 2 (H5) or NanoPi NEO AIR (H3). Do I need to (1) rename 30-real-time143-full-plus-rt-fixes.patch.disabled AND (2) extract patches-4.14.52-rt34.tar.gz into userpatches ? Using just option (1) I don't get a modified kernel .config file, so cannot select Fully Preemptive. I have modified config-default.conf. KERNEL_ONLY, KERNEL_CONFIGURE and KERNEL_KEEP_CONFIG are all "yes" config-default.conf: # Read build script documentation http://www.armbian.com/using-armbian-tools/ # for detailed explanation of these options and for additional options not listed here KERNEL_ONLY="yes" # leave empty to select each time, set to "yes" or "no" to skip dialog prompt KERNEL_CONFIGURE="yes" # leave empty to select each time, set to "yes" or "no" to skip dialog prompt CLEAN_LEVEL="make,debs,oldcache" # comma-separated list of clean targets: "make" = make clean for selected kernel and u-boot, # "debs" = delete packages in "./output/debs" for current branch and family, # "alldebs" = delete all packages in "./output/debs", "images" = delete "./output/images", # "cache" = delete "./output/cache", "sources" = delete "./sources" # "oldcache" = remove old cached rootfs except for the newest 6 files DEST_LANG="en_US.UTF-8" # sl_SI.UTF-8, en_US.UTF-8 BOARD="" # advanced KERNEL_KEEP_CONFIG="yes" # do not overwrite kernel config before compilation EXTERNAL="yes" # build and install extra applications and drivers EXTERNAL_NEW="prebuilt" # compile and install or install prebuilt additional packages CREATE_PATCHES="no" # wait that you make changes to uboot and kernel source and creates patches BUILD_ALL="no" # cycle through available boards and make images or kernel/u-boot packages. # set KERNEL_ONLY to "yes" or "no" to build all packages/all images BSPFREEZE="" # freeze armbian packages (u-boot, kernel, dtb) INSTALL_HEADERS="" # install kernel headers package LIB_TAG="master" # change to "branchname" to use any branch currently available. After compiling (admittedly on Ubuntu 16.04.4 x64, not Ubuntu Bionic 18.04 x64) I scp the resulting .deb's to the board (NanoPi NEO 2 shown), then pi@nanopineo2:~$ sudo dpkg -i *.deb (Reading database ... 52634 files and directories currently installed.) Preparing to unpack linux-dtb-next-sunxi64_5.50_arm64.deb ... Unpacking linux-dtb-next-sunxi64 (5.50) over (5.50) ... Preparing to unpack linux-headers-next-sunxi64_5.50_arm64.deb ... Unpacking linux-headers-next-sunxi64 (5.50) over (5.50) ... Preparing to unpack linux-image-next-sunxi64_5.50_arm64.deb ... Unpacking linux-image-next-sunxi64 (5.50) over (5.50) ... Preparing to unpack linux-source-next-sunxi64_5.50_all.deb ... Unpacking linux-source-4.14.52-next-sunxi64 (4.14.52-next-sunxi64+5.50) over (4.14.52-next-sunxi64+5.50) ... Preparing to unpack linux-u-boot-next-nanopineo2_5.50_arm64.deb ... Unpacking linux-u-boot-nanopineo2-next (5.50) over (5.50) ... Setting up linux-dtb-next-sunxi64 (5.50) ... Setting up linux-headers-next-sunxi64 (5.50) ... Compiling headers - please wait ... Setting up linux-image-next-sunxi64 (5.50) ... update-initramfs: Generating /boot/initrd.img-4.14.52-rt34-sunxi64 update-initramfs: Converting to u-boot format Setting up linux-source-4.14.52-next-sunxi64 (4.14.52-next-sunxi64+5.50) ... Setting up linux-u-boot-nanopineo2-next (5.50) ... Updating u-boot on /dev/mmcblk0 Using either just option (2), or both (1) and (2) combined, I get similar results : pi@nanopineo2:~/rt-tests-1.0$ sudo ./cyclictest -p 80 -t5 -n # /dev/cpu_dma_latency set to 0us policy: fifo: loadavg: 0.08 0.10 0.05 1/126 1901 T: 0 ( 1873) P:80 I:1000 C: 22898 Min: 7 Act: 10 Avg: 103 Max: 2070 T: 1 ( 1874) P:80 I:1500 C: 15409 Min: 7 Act: 11 Avg: 110 Max: 2004 T: 2 ( 1875) P:80 I:2000 C: 11570 Min: 7 Act: 9 Avg: 113 Max: 2197 T: 3 ( 1876) P:80 I:2500 C: 9257 Min: 7 Act: 8 Avg: 129 Max: 1938 T: 4 ( 1877) P:80 I:3000 C: 7714 Min: 7 Act: 10 Avg: 129 Max: 1969 These results suggest to me that I don't have an RT kernel. however uname says different: pi@nanopineo2:~/rt-tests-1.0$ uname -a Linux nanopineo2 4.14.52-rt34-sunxi64 #15 SMP PREEMPT RT Mon Jul 2 08:58:04 AWST 2018 aarch64 aarch64 aarch64 GNU/Linux As I said in the first line NOOB here. Where have I gone wrong?