Updating FSYNC device tree

Autonomous Vehicles DRIVE AGX Thor DRIVE AGX Thor General
1

DRIVE OS Version: 7.0.3

Issue Description: How can I update the FSYNC device tree for the DRIVE AGX Thor Devkit?

I’m able to update timings using fsync_debug (and this fix), but that does not seem to apply across reboots.

I see documentation on updating the device tree for FSYNC signal generation, but it’s not clear the best way to update the Thor itself. Do I need to reflash the whole device or can I do an incremental update?

5

Do you mean to make changes on Thor and avoid re-flashing?

6

Yes, I want to avoid fully reflashing the thor if possible. I’d also like an outline describing the procedure for updating this device tree definition on the thor either through fiully reflashing or just updating the device tree without reflashing.

10

Could you please provide any update for this topic?

11

Dear @brad.pankow1 ,
For persistent frequency/duty/offset across reboots, you need to edit the generator@ nodes in the DT and reflash the DTB.

Please refer to

  1. Fsync Signal Generation — NVIDIA DriveOS 7.0.3 Linux SDK Developer Guide
  2. Camera Frame Synchronization — NVIDIA DriveOS 7.0.3 Linux SDK Developer Guide
12

Thank you, how do I reflash the DTB? What command do I use to compile the DTB and what can I use to reflash just the DTB on the unit?

Also, which device tree file do I update? It looks like there’s a few options with the tsc_sig_gen generator defined.

drive-foundation/platform-config/hardware/nvidia/platform/t264/automotive/kernel-dts/p3960/common/tegra264-p3960-camera.dtsi

drive-foundation/platform-config/hardware/nvidia/t264/nv-public/tegra264.dtsi

drive-linux/kernel/common/hardware/nvidia/t264/tegra264.dtsi