# Oes Orin NX 16G support SSC (Spread Spectrum Clocking) and how to enable it? **URL:** \ **Category:** Jetson Orin NX\ **Tags:** pcie\ **Created:** [September 5, 2026, 6:33am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443 "2026-09-05T06:33:25Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![jack.yan](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jack.yan](https://forums.developer.nvidia.com/u/jack.yan)\ **Post date:** [September 5, 2026, 6:33am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/1 "2026-09-05T06:33:25Z")
Hi: **Hardware:** Orin NX 16GB on custom carrier board **Software:** JetPack 5.1.5 We are experiencing an EMI issue on our custom Orin NX carrier board. The PCIe SSD is generating electromagnetic interference that affects the GNSS module on the aircraft where our device is installed. This interference prevents the aircraft from taking off. We would like to enable Spread Spectrum Clocking (SSC) on the PCIe interface to see if it helps reduce the EMI. Our questions: 1. Does Orin NX support SSC for PCIe? I couldn’t find explicit documentation confirming this. 2. How can I verify whether SSC is currently enabled or disabled? I’ve seen references to checking bit 12 of register `0x20041000` — is this correct for Orin NX? 3. If SSC is not enabled, what are the exact device tree modifications needed to enable it? I understand this likely involves modifying the BPMP device tree. Any guidance would be greatly appreciated. Thanks! ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [September 5, 2026, 8:31am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/3 "2026-09-05T08:31:33Z")
SSC are all enabled by default on every PCIe controller of Orin NX/Nano/AGX. ---
**Author:** ![jack.yan](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jack.yan](https://forums.developer.nvidia.com/u/jack.yan)\ **Post date:** [September 7, 2026, 1:33am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/4 "2026-09-07T01:33:53Z")
Hi,WayneWWW: Thank you for your quick response. We would like to verify the actual SSC status on our custom carrier board to ensure it is indeed active. 1. Could you please provide the official command or method to check whether SSC is currently enabled for each PCIe controller? 2. Is there a quick command or method to temporarily disable SSC for comparison testing? Our goal is to quickly enable/disable SSC and measure the EMI difference on the GNSS module to determine whether SSC helps reduce the interference. Any guidance would be greatly appreciated. Thank you. ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [September 7, 2026, 2:09am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/5 "2026-09-07T02:09:57Z")
Please check the tuning guide of Orin AGX/NX/Nano. There are patches to disable SSC in the bpmp dtb. ---
**Author:** ![jack.yan](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jack.yan](https://forums.developer.nvidia.com/u/jack.yan)\ **Post date:** [September 7, 2026, 8:53am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/6 "2026-09-07T08:53:56Z")
Hi, WayneWWW: Thank you for your quick response. Can you provide a link to the **tuning guide for Orin AGX/NX/Nano**? I did not find any patches or instructions related to SSC in the JetPack guide ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [September 7, 2026, 8:55am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/7 "2026-09-07T08:55:24Z")
> **[Jetson Download Center](https://developer.nvidia.com/embedded/downloads#?search=tuning)** hardware document would be in the download center. software document would be in the jetpack guide (because it could be changed version by version). ---
**Author:** ![jack.yan](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jack.yan](https://forums.developer.nvidia.com/u/jack.yan)\ **Post date:** [September 9, 2026, 12:31pm UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/8 "2026-09-09T12:31:20Z")
Hi,WayneWWW: Thank you for your response. I have successfully downloaded the patch “ **0002-disabling-the-spread-Spectrum.patch** ”. However, I am unsure which DTB file I need to modify and replace after applying the patch. On my Orin NX 16GB custom carrier board (JetPack 5.1.5), I checked the `/boot` directory and found many DTB files. The relevant ones appear to be: ```auto root@tegra-ubuntu:/boot# ls dtb tegra194-p2888-0004-e3900-0000-respeaker-4-mic-array.dtbo tegra234-p3737-0000-p3701-0000-hdr40.dtbo extlinux tegra194-p2888-0004-e3900-0000-respeaker-4-mic-lin-array.dtbo tegra234-p3737-0000-p3701-0000-m2ke.dtbo Image tegra194-p2888-0008-p2822-0000.dtb tegra234-p3737-0000-p3701-0000-respeaker-4-mic-array.dtbo Image.t19x tegra194-p2888-0008-p2822-0000.dtb.sig tegra234-p3737-0000-p3701-0000-respeaker-4-mic-lin-array.dtbo Image.t19x.sig tegra194-p2888-0008-p2822-0000-maxn.dtb tegra234-p3737-audio-codec-rt5658-40pin.dtbo initrd tegra194-p2888-0008-p2822-0000-overlay.dtbo tegra234-p3737-camera-dual-hawk-ar0234-e3653-overlay.dtbo initrd.t19x tegra194-p3668-0000-p3509-0000.dtb tegra234-p3737-camera-dual-imx274-overlay.dtbo initrd.t19x.sig tegra194-p3668-0000-p3509-0000.dtb.sig tegra234-p3737-camera-e3331-overlay.dtbo kernel_tegra234-p3767-0000-p3768-0000-a0.dtb tegra194-p3668-0001-p3509-0000.dtb tegra234-p3737-camera-e3333-overlay.dtbo kernel_tegra234-p3767-0001-p3768-0000-a0.dtb tegra194-p3668-0001-p3509-0000.dtb.sig tegra234-p3737-camera-hawk-owl-overlay.dtbo kernel_tegra234-p3767-0004-p3768-0000-a0.dtb tegra194-p3668-all-p3509-0000-adafruit-sph0645lm4h.dtbo tegra234-p3737-camera-imx185-overlay.dtbo tegra194-p2822-camera-dual-imx274-overlay.dtbo tegra194-p3668-all-p3509-0000-adafruit-uda1334a.dtbo tegra234-p3737-camera-imx390-overlay.dtbo tegra194-p2822-camera-e2832-overlay.dtbo tegra194-p3668-all-p3509-0000-camera-imx219-dual.dtbo tegra234-p3737-overlay.dtbo tegra194-p2822-camera-e3326-overlay.dtbo tegra194-p3668-all-p3509-0000-camera-imx477-dual.dtbo tegra234-p3740-camera-hawk-owl-overlay.dtbo tegra194-p2822-camera-e3331-overlay.dtbo tegra194-p3668-all-p3509-0000-camera-imx477-imx219.dtbo tegra234-p3740-camera-p3785-overlay.dtbo tegra194-p2822-camera-e3333-overlay.dtbo tegra194-p3668-all-p3509-0000.dtb tegra234-p3767-0000-p3509-a02-adafruit-sph0645lm4h.dtbo tegra194-p2822-camera-eCAM130A_CUXVR-overlay.dtbo tegra194-p3668-all-p3509-0000.dtb.sig tegra234-p3767-0000-p3509-a02-adafruit-uda1334a.dtbo tegra194-p2822-camera-imx185-overlay.dtbo tegra194-p3668-all-p3509-0000-fe-pi-audio.dtbo tegra234-p3767-0000-p3509-a02-csi.dtbo tegra194-p2822-camera-imx390-overlay.dtbo tegra194-p3668-all-p3509-0000-hdr40.dtbo tegra234-p3767-0000-p3509-a02-fe-pi-audio.dtbo tegra194-p2888-0001-p2822-0000-adafruit-sph0645lm4h.dtbo tegra194-p3668-all-p3509-0000-m2ke.dtbo tegra234-p3767-0000-p3509-a02-hdr40.dtbo tegra194-p2888-0001-p2822-0000-adafruit-uda1334a.dtbo tegra194-p3668-all-p3509-0000-respeaker-4-mic-array.dtbo tegra234-p3767-0000-p3509-a02-m2ke.dtbo tegra194-p2888-0001-p2822-0000-csi.dtbo tegra194-p3668-all-p3509-0000-respeaker-4-mic-lin-array.dtbo tegra234-p3767-0000-p3509-a02-respeaker-4-mic-array.dtbo tegra194-p2888-0001-p2822-0000.dtb tegra194-p3668-p3509-overlay.dtbo tegra234-p3767-0000-p3509-a02-respeaker-4-mic-lin-array.dtbo tegra194-p2888-0001-p2822-0000.dtb.sig tegra234-p3701-0000-as-p3767-0000-p3737-0000.dtb tegra234-p3767-0000-p3768-0000-a0.dtb tegra194-p2888-0001-p2822-0000-fe-pi-audio.dtbo tegra234-p3701-0000-as-p3767-0001-p3737-0000.dtb tegra234-p3767-0000-p3768-0000-csi.dtbo tegra194-p2888-0001-p2822-0000-hdr40.dtbo tegra234-p3701-0000-as-p3767-0003-p3737-0000.dtb tegra234-p3767-0000-super-p3768-0000-a0.dtb tegra194-p2888-0001-p2822-0000-m2ke.dtbo tegra234-p3701-0000-as-p3767-0004-p3737-0000.dtb tegra234-p3767-0001-p3768-0000-a0.dtb tegra194-p2888-0001-p2822-0000-maxn.dtb tegra234-p3701-0000-p3737-0000.dtb tegra234-p3767-0001-super-p3768-0000-a0.dtb tegra194-p2888-0001-p2822-0000-maxn.dtb.sig tegra234-p3701-0000-p3737-0000-kexec.dtb tegra234-p3767-0003-p3768-0000-a0.dtb tegra194-p2888-0001-p2822-0000-overlay.dtbo tegra234-p3701-0002-p3711-0000.dtb tegra234-p3767-0003-super-p3768-0000-a0.dtb tegra194-p2888-0001-p2822-0000-respeaker-4-mic-array.dtbo tegra234-p3701-0002-p3740-0002-b01.dtb tegra234-p3767-0004-p3768-0000-a0.dtb tegra194-p2888-0001-p2822-0000-respeaker-4-mic-lin-array.dtbo tegra234-p3701-0002-p3740-0002.dtb tegra234-p3767-0004-super-p3768-0000-a0.dtb tegra194-p2888-0004-e3900-0000-adafruit-sph0645lm4h.dtbo tegra234-p3701-0004-p3737-0000.dtb tegra234-p3767-camera-imx219-dual.dtbo tegra194-p2888-0004-e3900-0000-adafruit-uda1334a.dtbo tegra234-p3701-0005-p3737-0000.dtb tegra234-p3767-camera-imx477-dual.dtbo tegra194-p2888-0004-e3900-0000-csi.dtbo tegra234-p3701-0008-p3737-0000.dtb tegra234-p3767-camera-imx477-imx219.dtbo tegra194-p2888-0004-e3900-0000.dtb tegra234-p3701-0008-p3740-0002-c01.dtb tegra234-p3767-camera-p3768-imx219-dual.dtbo tegra194-p2888-0004-e3900-0000.dtb.sig tegra234-p3701-overlay.dtbo tegra234-p3767-camera-p3768-imx477-dual-4lane.dtbo tegra194-p2888-0004-e3900-0000-dual-imx274.dtbo tegra234-p3737-0000-p3701-0000-adafruit-sph0645lm4h.dtbo tegra234-p3767-camera-p3768-imx477-dual.dtbo tegra194-p2888-0004-e3900-0000-fe-pi-audio.dtbo tegra234-p3737-0000-p3701-0000-adafruit-uda1334a.dtbo tegra234-p3767-camera-p3768-imx477-imx219.dtbo tegra194-p2888-0004-e3900-0000-hdr40.dtbo tegra234-p3737-0000-p3701-0000-csi.dtbo tegra234-p3767-overlay.dtbo tegra194-p2888-0004-e3900-0000-imx274.dtbo tegra234-p3737-0000-p3701-0000-fe-pi-audio.dtbo tegra234-p3768-overlay.dtbo root@tegra-ubuntu:/boot# cd dtb/ root@tegra-ubuntu:/boot/dtb# ls kernel_tegra234-p3767-0000-p3768-0000-a0.dtb ``` Which dtb file should I replace after adding the patch? ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [September 9, 2026, 3:41pm UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/9 "2026-09-09T15:41:13Z")
No, that file is bpmp dtb which is located on your host PC. You need to use dtc tool to modify that one. Please check your flash log and it will tell you which bpmp dtb you are using for your board. ---
**Author:** ![jack.yan](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jack.yan](https://forums.developer.nvidia.com/u/jack.yan)\ **Post date:** [September 10, 2026, 1:26am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/10 "2026-09-10T01:26:34Z")
Hi,WayneWWW: I see, I still need to reflash the entire system. This patch is on the bootloader. Can I just flash the bootloader? ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [September 10, 2026, 1:52am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/11 "2026-09-10T01:52:47Z")
no, this one needs to do full flash. ---
**Author:** ![jack.yan](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jack.yan](https://forums.developer.nvidia.com/u/jack.yan)\ **Post date:** [September 11, 2026, 1:53am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/12 "2026-09-11T01:53:41Z")
Hi, WayneWWW: I couldn’t find the bpmp.dtb file under Linux\_for\_Tegra/bootloader. ```auto root@yan-Legion-Y9000P-IRX9:/home/yan/nvidia/nvidia_sdk/JetPack_5.1.5_Linux_JETSON_ORIN_NANO_TARGETS/Linux_for_Tegra/bootloader# find -name "*bpmp*.dtb" ./tegra234-bpmp-3767-0004-3509-a02.dtb ./tegra234-bpmp-3767-0000-a02-3509-a02.dtb ./7546/tegra234-bpmp-3767-0004-3509-a02.dtb ./7546/tegra234-bpmp-3767-0004-3509-a02_with_odm.dtb ./7546/tegra234-bpmp-3767-0000-a02-3509-a02.dtb ./7546/tegra234-bpmp-3767-0001-3509-a02.dtb ./tegra234-bpmp-3767-0001-3509-a02.dtb ./17009/tegra234-bpmp-3767-0004-3509-a02.dtb ./17009/tegra234-bpmp-3767-0004-3509-a02_with_odm.dtb ./17009/tegra234-bpmp-3767-0000-a02-3509-a02.dtb ./17009/tegra234-bpmp-3767-0004-3509-a02_with_odm_aligned_sigheader.dtb ./17009/tegra234-bpmp-3767-0001-3509-a02.dtb ./17009/tegra234-bpmp-3767-0004-3509-a02_with_odm_sigheader.dtb ./17009/tegra234-bpmp-3767-0004-3509-a02_with_odm_aligned.dtb ./t186ref/tegra234-bpmp-3701-0002-3740-0002-b01.dtb ./t186ref/tegra234-bpmp-3701-0008-3740-0002-c00.dtb ./t186ref/tegra234-bpmp-3767-0004-3509-a02.dtb ./t186ref/tegra234-bpmp-3701-0000-3737-0000-maxn.dtb ./t186ref/tegra234-bpmp-3701-0002-3711-0000.dtb ./t186ref/tegra234-bpmp-3767-0003-3768-super.dtb ./t186ref/tegra234-bpmp-3701-0005-3737-0000-maxn.dtb ./t186ref/tegra234-bpmp-3767-0000-a02-3509-a02.dtb ./t186ref/tegra194-a02-bpmp-p2888-0005-a04.dtb ./t186ref/tegra194-a02-bpmp-p2888-0004-a04-mccoy.dtb ./t186ref/tegra234-bpmp-3701-0004-3737-0000-maxn.dtb ./t186ref/tegra234-bpmp-3767-0000-3768-super.dtb ./t186ref/tegra234-bpmp-3767-0004-3768-super.dtb ./t186ref/tegra234-bpmp-3701-0005-as-3701-0004-3737-0000.dtb ./t186ref/tegra234-bpmp-3767-0000-a02-as-3767-0004-3509-a02.dtb ./t186ref/tegra194-a02-bpmp-p2888-0008-b01-jaxi-noecc.dtb ./t186ref/tegra234-bpmp-3767-0001-3509-a02.dtb ./t186ref/tegra234-bpmp-3701-0000-as-3767-0003-3737-0000.dtb ./t186ref/tegra234-bpmp-3767-0001-3509-a02-maxn.dtb ./t186ref/tegra194-a02-bpmp-p2888-a01.dtb ./t186ref/tegra234-bpmp-3767-0000-a02-as-3767-0001-3509-a02.dtb ./t186ref/tegra234-bpmp-3701-0000-as-3767-0001-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0005-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0000-as-3767-0004-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0008-3737-0000-maxn.dtb ./t186ref/tegra234-bpmp-3767-0001-3768-super.dtb ./t186ref/tegra234-bpmp-3767-0000-a02-3509-a02-maxn.dtb ./t186ref/tegra194-a02-bpmp-p2888-a04-maxn.dtb ./t186ref/tegra194-a02-bpmp-p2888-0005-a04-maxn.dtb ./t186ref/tegra234-bpmp-3701-0005-as-3767-0000-3737-0000.dtb ./t186ref/tegra194-a02-bpmp-p2888-a02.dtb ./t186ref/tegra194-a02-bpmp-p2888-a04.dtb ./t186ref/tegra234-bpmp-3767-0000-a02-as-3767-0003-3509-a02.dtb ./t186ref/tegra194-a02-bpmp-p2888-0008-b01-jaxi.dtb ./t186ref/tegra234-bpmp-3701-0008-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0000-as-3767-0000-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0002-3740-0002.dtb ./t186ref/tegra234-bpmp-3767-0001-3768-super-maxn.dtb ./t186ref/tegra234-bpmp-3701-0005-as-3767-0001-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0005-as-3767-0003-3737-0000.dtb ./t186ref/tegra194-a01-bpmp-p2888-a02.dtb ./t186ref/tegra234-bpmp-3767-0000-3768-super-maxn.dtb ./t186ref/tegra194-a02-bpmp-p2888-0008-b01-jaxi-maxn.dtb ./t186ref/tegra194-a02-bpmp-p3668-a00.dtb ./t186ref/tegra234-bpmp-3701-0000-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0004-3737-0000.dtb ./t186ref/tegra194-a01-bpmp-p2888-a01.dtb ./t186ref/tegra234-bpmp-3701-0000-as-3701-0004-3737-0000.dtb ./t186ref/tegra234-bpmp-3701-0005-as-3767-0004-3737-0000.dtb ./t186ref/tegra234-bpmp-3767-0003-3509-a02.dtb ./169616/tegra234-bpmp-3767-0004-3509-a02.dtb ./169616/tegra234-bpmp-3767-0000-a02-3509-a02.dtb ``` Query the dtb file related to the bpmp name under bootloader, which dtb file should be used to add patches to orin nx 16G? ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [September 11, 2026, 2:49am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/13 "2026-09-11T02:49:58Z")
As I already told, check your flash log. Your flash log will tell you the answer. If you don’t know what I mean, post your flash log and I will tell you. ---
**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\ **Post date:** [September 25, 2026, 2:49am UTC](https://forums.developer.nvidia.com/t/oes-orin-nx-16g-support-ssc-spread-spectrum-clocking-and-how-to-enable-it/382443/14 "2026-09-25T02:49:59Z")
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