I am using imx6ull , on reading my ADC through SPI alone i am getting correct values but if i run it along with some other application i am missing some samples in regular intervals, so i planned to add rt patch to my project to avoid unnecessary background operations .can anyone share me with rt patch links for imx6ull.
help is appreciated , thanks in advance .
Regards ,
Anuranjith Y
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Hello,
To address the issue of missing samples when running your ADC readings through SPI alongside other applications on the iMX6ULL, applying a real-time (RT) patch to your Linux kernel can indeed help in reducing latency and ensuring more deterministic behavior of critical tasks.
For integrating an RT patch into your project, you will need to follow these general steps, tailored to the Yocto Project environment, which is commonly used with Toradex modules:
Select the appropriate RT patch version that matches the version of the Linux kernel you are using. The RT patch version must correspond to the kernel version to ensure compatibility.
Apply the RT patch to the Linux kernel source within your Yocto Project environment. This involves downloading the RT patch, then using the patch command or the Yocto Project’s bbappend file mechanism to integrate the RT patch into the kernel recipe.
Adjust the kernel configuration to enable real-time features. This can be done by modifying the kernel configuration (defconfig) to include options such as PREEMPT_RT_FULL, which fully enables the real-time capabilities of the patch. This step may also involve tuning other kernel parameters to optimize for real-time performance.
Rebuild your Yocto Project image with the modified kernel. This will include the RT patch and any configuration changes you’ve made. Ensure that your build environment is correctly set up to include these modifications in the build process.
Test the modified system to verify that the real-time capabilities are meeting your requirements. This may involve running your ADC through SPI application alongside the other applications that previously caused sample loss, to ensure that the issue has been mitigated.
It’s important to note that while applying an RT patch can significantly improve real-time performance, it may also require careful tuning of both the kernel and your applications to achieve the desired results. Additionally, the impact on overall system performance should be considered, as enabling real-time features can affect the behavior of non-real-time tasks.
Since specific instructions can vary based on the exact versions of the Linux kernel and the Yocto Project environment you are using, please ensure to consult the relevant documentation and resources specific to your setup for detailed guidance.
Best regards,
Toradex AI Assistant
Please, also check if these links can help you solve your problem:
Hi,
Please read about real time solutions from here.
Same article contains information to build images with PREEMPT_RT patch.
