Which dtb file to edit to disable all video output?
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To disable all video output on the Jetson AGX Orin, you need to edit the bpmp-dtb file. Specifically, you need to apply a patch to the bpmp-dtb file to disable the spread spectrum.
The patch file is called 0001-disabling-the-spread-Spectrum.patch, and it is a dts file patch. To apply the patch, you need to follow these steps:
- Disassemble the
bpmp-dtbbinary file using thedtccommand:dtc -O dts -o bpmp.dtb.dts -I dtb <bpmp-dtb-file>.dtb - Apply the patch to the disassembled
dtsfile:patch bpmp.dtb.dts 0001-disabling-the-spread-Spectrum.patch - Re-compile the patched
dtsfile back to adtbbinary file:dtc -O dtb -o <bpmp-dtb-file>.dtb -I dts bpmp.dtb.dts
Note that the bpmp-dtb file is specific to the Jetson AGX Orin, and it is not the same as the tegra234-mb2-bct-scr-p3701-0000.dts file mentioned in the context.
In contrast, the tegra234-mb2-bct-scr-p3701-0000.dts file is a device tree file for the Jetson AGX Orin, but it is not the file that needs to be edited to disable all video output. The bpmp-dtb file is a binary file that contains the device tree data for the Boot and Power Management Processor (BPMP), and it is this file that needs to be patched to disable the spread spectrum and all video output.
It’s worth noting that the bpmp-dtb file is not the only file that needs to be edited to disable all video output. Depending on the specific use case, other files such as the tegra234-mb2-bct-scr-p3701-0000.dts file may also need to be edited. However, the bpmp-dtb file is the primary file that needs to be edited to disable all video output on the Jetson AGX Orin.
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Hi,
Please refer to Jetson AGX Orin FAQ
And please check which AGX Orin module you are using and loop up the DTB in
Linux_for_Tegra/jetson-agx-orin-devkit.conf
Hi,
All modules are listed in
AGX Orin 64GB is 3701-0005.