[split] Real Time Kernels discussion
#41
(28-Dec-2023, 04:44 PM)Snoopy8 Wrote: Can't upload tar file to Wiki. Have sent you link to access Google Docs.
Don't think I see this anywhere yet, will double check later.
 
(28-Dec-2023, 04:44 PM)Snoopy8 Wrote: I suspect that you may be able to use /boot/firmware/config.txt to reference the new kernel but I was not able to find the right fields.
https://www.raspberrypi.com/documentatio...g_txt.html
Yes, it's the kernel parameter. However the boot image is actually in /boot/firmware, and it's kernel_v8.img etc for bookworm and vmlinuz for Ubuntu. The kernel is compressed too meaning I have to decompress the image to find the version string. Kind of PITA because on PC systems the kernel version is right in the kernel image filename making it easy.
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#42
(29-Dec-2023, 09:56 AM)agent_kith Wrote: Don't think I see this anywhere yet, will double check later.
Please check your messages here
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#43
Following on from the previous posts with AK, this official Raspberry documentation gives some guidance on how to replace an existing kernel
https://www.raspberrypi.com/documentatio...ernel.html

Rather than overwrite the existing kernel, used the following:
PHP Code:
sudo mkdir /boot/firmware/so
sudo mkdir 
/boot/firmware/so/overlays-so
*
the following files from a make
*
sudo cp arch/arm64/boot/dts/broadcom/*.dtb /boot/firmware/so/
sudo cp arch/arm64/boot/dts/overlays/*.dtb* /boot/firmware/so/overlays-so/
sudo cp arch/arm64/boot/dts/overlays/README /boot/firmware/so/overlays-so/
sudo cp arch/arm64/boot/Image.gz /boot/firmware/kernel-so.img
sudo nano /boot/firmware/config.txt  * to add the following
os_prefix=so/
overlay_prefix=overlays-so/
kernel=/kernel-so.img 

To copy the real time kernel to another instance, will need to tar the above make folders and files, and the folder
/usr/lib/modules/6.6.35-rt34-so+.  Replace "6.6.35-rt34-so+" with the name of the RT kernel.
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