I am looking for a Linux kernel patch for reverse RefClk on Jetpack 5.0.2. I have a patch for Jetpack 4.6 (Kernel 4.9.253) which involves plugin-manager. As we don’t have plugin-manager available for Xavier NX for Jetpack 5.0.2. Can anyone please guide me how we can proceed with reverse refclk on Xavier NX?
Hi @DaneLLL , The Pcie Gen3 switch is in Direct Switch (D-Switch mode) and this will require all the NX in the system to be ROOT port mode and all the NX modules must be connected to PFX using common clocking. To enable this, we need reverse RefClk to be provided all other modules except one. Please let me know if you need more information. The patch I mentioned above was used in JP 4.6 to use this feature.
Hi,
Plugin manager is to override the original setting. You can apply the setting to device tree of Xavier NX directly. You can check if the setting is correct after booting, by executing xxd. For example:
Hi,
We would suggest confirm it on Jetpack 4.6. Please not to apply the patch on Jetpack 4.6 to confirm if it is must-have. Ideally you would need to port the same from K4.9 to K5.10.