January-31st-2020, 09:01 AM
Hi Roy,
oh did not know your are using your own SD card.
What I can tell you about the RT kernel patch is that the general patch has to fit to the used kernel. We are using kernel 4.9 with the RT patch and it worked fine. Then we have started a project later using kernel 4.14 and wanted to integrate the very same RT patch and it failed cause it produced 30% CPU load basically and this was unacceptable for us
1. copying the FAT32 partition is not enough. netPI SD card has 4 partitions. You can see them if you mount the SD card in Ubuntu for example. All 4 partitions are needed
2. yes the only chance I see is to build your own RT patched kernel yourself and make your own tests and collect experience like we did with kernel 4.14. I know currently the raspbian kernel is 4.19. I cannot tell you if there is patch available for kernel 4.19. In general we do not share our yocto reciept, but I thought building an own kernel along with any linux is well documented on the web? Isn't it? The landing page is this one here https://wiki.linuxfoundation.org/realtime/start
Thx
Armin
oh did not know your are using your own SD card.
What I can tell you about the RT kernel patch is that the general patch has to fit to the used kernel. We are using kernel 4.9 with the RT patch and it worked fine. Then we have started a project later using kernel 4.14 and wanted to integrate the very same RT patch and it failed cause it produced 30% CPU load basically and this was unacceptable for us
1. copying the FAT32 partition is not enough. netPI SD card has 4 partitions. You can see them if you mount the SD card in Ubuntu for example. All 4 partitions are needed
2. yes the only chance I see is to build your own RT patched kernel yourself and make your own tests and collect experience like we did with kernel 4.14. I know currently the raspbian kernel is 4.19. I cannot tell you if there is patch available for kernel 4.19. In general we do not share our yocto reciept, but I thought building an own kernel along with any linux is well documented on the web? Isn't it? The landing page is this one here https://wiki.linuxfoundation.org/realtime/start
Thx
Armin
„You never fail until you stop trying.“, Albert Einstein (1879 - 1955)
