In short, I'm trying to build a FULLY-PREEMPT-REALTIME system to run on my Orange Pi Zero 2W.   

 

I used this post as a reference, and got quite far. But, I'm stuck on something that I believe I undestand, but don't know how to resolve. 

I don't believe this is a probleme specific to my board though.

 

 

What I've done so far with success is both install and run a pre-built Armbian Image on this board, as well as build my own image and run it.  Both work perfectly.

 

Now, I'm attempting to apply the RT patch and build a fresh image (or even just a Kernel) to get the FULL REALTIME kernel support working. 

However, the build system fails after the kernel is built sucesfully, as it is unable to find the resulting kernel image generated.

I belive the issue is simply that when the RT .patch is applied and configured to the kernel, it builds a kernel file with an alterered filename.  

Instead of 6.6.65-current-sunxi64 It creates 6.6.65-rt47-current-sunxi64  

As a result, the build process for the kernel stage fails as it's unable to find the file it is expecting to find.

 

Here is what I have done, and what outputs I am finding.

 

As stated, It was a success with A locally built clean Armbian

./compile.sh BOARD=orangepizero2w BRANCH=current RELEASE=bookworm BUILD_MINIMAL=yes BUILD_DESKTOP=no KERNEL_CONFIGURE=no AUFS=no KERNELBRANCH='tag:v6.6.65'

System booted up and ran as normal.

$ uname -a 
inux orangepizero2w 6.6.65-current-sunxi64 #2 SMP Wed Dec 11 15:13:43 UTC 2024 aarch64 GNU/Linux

 

I then attempted to apply the PREEMPT_RT kernel patch.

download and gunzip

https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.6/patch-6.6.65-rt47.patch.gz

into the directory userpatches/kernel/archive/sunxi-6.6

 

Then a kernel-configure step 

Worth noting that I do see this patch file applied in the output of the following command.

./compile.sh BOARD=orangepizero2w BRANCH=current RELEASE=bookworm KERNELBRANCH='tag:v6.6.65' kernel-config

Where I proceeded to enable the full REALTIME kernel (4th option).  

General setup -> Preemption Mode -> Fully Preemptible Kernel (Real-Time)

 

Finally followed with a compile command. 

./compile.sh BOARD=orangepizero2w BRANCH=current RELEASE=bookworm BUILD_MINIMAL=yes BUILD_DESKTOP=no KERNEL_CONFIGURE=no AUFS=no KERNELBRANCH='tag:v6.6.65'

 

The part of the build output that I beleive is relevant is this. It shows the failure, and what I believe is an indication of why it fails.  It appears that the build script it is not aware of needing to find the file name that has the rt47 portion.

🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/sun50i-h616-i2c1-pi.dtbo
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/sun50i-h616-i2c2-pi.dtbo
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/sun50i-h616-gpu.dtbo
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/sun50i-a64-fixup.scr
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/sun50i-h5-fixup.scr
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/sun50i-h6-fixup.scr
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/sun50i-h616-fixup.scr
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/README.sun50i-a64-overlays
[🐳|🔨]     INSTALL /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/dtbs/allwinner/overlay/README.sun50i-h5-overlays
[🐳|🔨]   make[1]: Nothing to be done for 'install'.
[🐳|🔨]   make: Nothing to be done for 'install'.
[🐳|🌱] Kernel built in [ 95 seconds - 6.6.65-sunxi64 ]
[🐳|🌱] Packaging kernel [ sunxi64 linux-sunxi64-current ]
[🐳|🌱] Kernel .deb package version [ 6.6.65-S943e-Dfa7d-P3e46-Caa1fH5c21-HK01ba-Vc222-B59f0-R448a ]
[🐳|🌱] Packaging linux-image [ sunxi64 linux-sunxi64-current ]
[🐳|🔨]   [ 26M]  /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/image/boot
[🐳|🔨]   ├── [215K]  config-6.6.65-rt47-current-sunxi64
[🐳|🔨]   ├── [3.4M]  System.map-6.6.65-rt47-current-sunxi64
[🐳|🔨]   └── [ 22M]  vmlinuz-6.6.65-rt47-current-sunxi64
[🐳|🔨]   
[🐳|🔨]     26M used in 0 directories, 3 files
[🐳|🌱] Kernel-built image filetype [ vmlinuz-6.6.65-current-sunxi64: cannot open `/armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/image/boot/vmlinuz-6.6.65-current-sunxi64' (No such file or directory) ]
[🐳|🔨]   ls: cannot access '/armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/image/boot/vmlinuz-6.6.65-current-sunxi64': No such file or directory
[🐳|🔨]   /armbian/.tmp/work-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0/kernel_dest_install_dir-44x4J/image/boot:
[🐳|🔨]   total 26220
[🐳|🔨]   drwxrwxr-x 2 root root      100 Dec 30 17:08 .
[🐳|🔨]   drwxrwxr-x 3 root root       60 Dec 30 17:07 ..
[🐳|🔨]   -rw-rw-r-- 1 root root   220621 Dec 30 17:08 config-6.6.65-rt47-current-sunxi64
[🐳|🔨]   -rw-rw-r-- 1 root root  3564498 Dec 30 17:08 System.map-6.6.65-rt47-current-sunxi64
[🐳|🔨]   -rw-rw-r-- 1 root root 23056392 Dec 30 17:08 vmlinuz-6.6.65-rt47-current-sunxi64
[🐳|💥] Error 2 occurred in main shell [ at /armbian/lib/functions/logging/runners.sh:211
    run_host_command_logged_raw() --> lib/functions/logging/runners.sh:211
        run_host_command_logged() --> lib/functions/logging/runners.sh:193
   kernel_package_callback_linux_image() --> lib/functions/compilation/kernel-debs.sh:221
              create_kernel_deb() --> lib/functions/compilation/kernel-debs.sh:131
   prepare_kernel_packaging_debs() --> lib/functions/compilation/kernel-debs.sh:72
                 kernel_package() --> lib/functions/compilation/kernel.sh:248
                  do_with_hooks() --> lib/functions/general/extensions.sh:567
                do_with_logging() --> lib/functions/logging/section-logging.sh:81
   kernel_prepare_build_and_package() --> lib/functions/compilation/kernel.sh:171
                 compile_kernel() --> lib/functions/compilation/kernel.sh:100
   artifact_kernel_build_from_sources() --> lib/functions/artifacts/artifact-kernel.sh:240
    artifact_build_from_sources() --> lib/functions/artifacts/artifacts-obtain.sh:34
       obtain_complete_artifact() --> lib/functions/artifacts/artifacts-obtain.sh:280
       build_artifact_for_image() --> lib/functions/artifacts/artifacts-obtain.sh:392
    main_default_build_packages() --> lib/functions/main/build-packages.sh:106
   full_build_packages_rootfs_and_image() --> lib/functions/main/default-build.sh:31
          do_with_default_build() --> lib/functions/main/default-build.sh:42
         cli_standard_build_run() --> lib/functions/cli/cli-build.sh:25
        armbian_cli_run_command() --> lib/functions/cli/utils-cli.sh:136
                 cli_entrypoint() --> lib/functions/cli/entrypoint.sh:176
                           main() --> compile.sh:50
 ]
[🐳|💥] Cleaning up [ please wait for cleanups to finish ]
[🐳|🌿] ANSI log file built; inspect it by running: [ less -RS output/logs/log-build-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0.log.ans ]
[🐳|🌿] Share log manually (or SHARE_LOG=yes): [ curl --data-binary @output/logs/log-build-3b1e65cb-74c9-47f6-aa6c-d7787497b9b0.log.ans https://paste.armbian.com/log ]
[💥] -------------Docker run failed after 152s-------------------------- [ 🐳 failed ]
[🌱] Cleaning up [ please wait for cleanups to finish ]
 ~/devel/personal/Armbian/build │ main !1                                                                                           

 

 

Thanks for any help with this. 

I hope I've provided enough information to make sense of what I'm attempting to do.

I know this isn't the CORRECT fix. 

But, I managed to hack a working image by modifying the file kernel-deb.sh

At line 52, I changed

 

declare kernel_version_family="${kernel_version}-${BRANCH}-${LINUXFAMILY}"

to

declare kernel_version_family="${kernel_version}-rt47-${BRANCH}-${LINUXFAMILY}"

 

The board booted, and uname shows the kernel I expected

$ uname -a
Linux orangepizero2w 6.6.65-rt47-current-sunxi64 #7 SMP PREEMPT_RT Wed Dec 11 15:13:43 UTC 2024 aarch 64 GNU/Linux

 

 

Edited December 31, 20241 yr by Skidd