Seihan

I successfully built an armbian image with PREEMPT_RT kernel, by changing line 52 in armbian/lib/functions/compilation/kernel-debs.sh into: declare kernel_version_family="${kernel_version}-rt48-${BRANCH}-${LINUXFAMILY}" This isn't a valid solution, but it worked for me, for this moment. root@lime2 ~ # uname -a Linux lime2 6.6.75-rt48-current-sunxi #19 SMP Sat Feb 1 17:37:57 UTC 2025 armv7l armv7l armv7l GNU/Linux Limitations: - works only for rt48 - kernel 6.6.75 - patch-6.6.74-rt48.patch.xz It is not possible to pin the build process to specific kernel version tags. The option exists, but it has no effect. Any hints on how to pin the builder to a specific kernel would be helpful to reproduce this build in the future.

@SysProg can you please provide instructions how you patched the kernel? As mentoined, I used the armbian build script. The RT patch is the last of 8 patches in my case. I'm trying to solve the issue with an extension hook. I use a second extension to modify the partitions on the image, this may solve your problem. The hooks format_partitions, and prepare_image_size are used for this as described here

@SysProg I'm also looking for a way to got a PREEMPT_RT kernel for Armbian. I followed the instructions from **indianajones** https://forum.armbian.com/topic/11491-real-time-operating-system/ to include a rt patch and running the `compile.sh` script. The patching and kernel compilation works, but the `compile.sh` script fails because of wrong references of filenames. Steps to reproduce: - Build environment: Docker - Board: lime2 - Kernel Release: jammy (22.04) - Kernel version: 6.6.75 - RT-Patch: patch-6.6.74-rt48.patch.xz https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patch-6.6.74-rt48.patch.xz Packaging linux-image [ sunxi linux-sunxi-current ] [🐳|🔨] [ 14M] /armbian/.tmp/work-faa9b4e0-5171-48e1-a64e-1437de80d285/kernel_dest_install_dir-GxS0c/image/boot [🐳|🔨] ├── [211K] config-6.6.75-rt48-current-sunxi [🐳|🔨] ├── [3.6M] System.map-6.6.75-rt48-current-sunxi [🐳|🔨] └── [ 10M] vmlinuz-6.6.75-rt48-current-sunxi [🐳|🔨] [🐳|🔨] 14M used in 0 directories, 3 files [🐳|🌱] Kernel-built image filetype [ vmlinuz-6.6.75-current-sunxi: cannot open `/armbian/.tmp/work-faa9b4e0-5171-48e1-a64e-1437de80d285/kernel_dest_install_dir-GxS0c/image/boot/vmlinuz-6.6.75-current-sunxi' (No such file or directory) ] [🐳|🔨] ls: cannot access '/armbian/.tmp/work-faa9b4e0-5171-48e1-a64e-1437de80d285/kernel_dest_install_dir-GxS0c/image/boot/vmlinuz-6.6.75-current-sunxi': No such file or directory The related function is `kernel_package_callback_linux_image()` inside `kernel-debs.sh`. I'm still try to find out how to solve this failure. The hook `call_extension_method "pre_package_kernel_image"` is maybe to key, or some extra build commands like *KERNEL_CONFIGURE*. I tried this quick and dirty extension, but no success so far: function pre_package_kernel_image__600_set_kernel_name() { # Determine the correct kernel image file name kernel_image_file=$(ls "${kernel_pre_package_path}/vmlinuz-6.6.75-*" 2>/dev/null) if [ -z "$kernel_image_file" ]; then echo "Error: Kernel image file not found!" >&2 run_host_command_logged ls -la "${kernel_pre_package_path}" exit 1 fi # Set the correct kernel image name kernel_image_pre_package_path="$kernel_image_file" echo "Using kernel image file: $kernel_image_pre_package_path" } Any help will be welcome.