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Jetson Customize Usb logo

Jetson Customize Usb

Organization
NVIDIA-AI-IOT
jetson-customize-usb

Enable/disable Jetson USB2/USB3 SS ports via kernel-DT overlay. Do NOT use for UPHY lane allocation or ODMDATA edits.

Overview

PublisherNVIDIA-AI-IOT
Repositoryjetson-bsp-skills
Skill namejetson-customize-usb
Stars
73
Forks
13
Bundled files
9
LicenseApache-2.0
Links
Skill sourceRepository
  • Markdown instructions

    A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.

  • Works with any LLM

    AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.

  • 9 bundled files

    Scripts, templates, and references the model can read while it works. Files are read-only and never executed.

  • Open source

    Published by NVIDIA-AI-IOT on GitHub. Read the source before you install it.

Installation

Install the Jetson Customize Usb AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

1

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

  1. Open the app and go to Plugins → Skills.
  2. Choose "Install from GitHub".
  3. Paste the skill folder URL below and confirm.
    https://github.com/NVIDIA-AI-IOT/jetson-bsp-skills/tree/main/skills/jetson-customize-usb
  4. Enable the skill in any chat where you want it available.
Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.
2

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills
git clone --depth 1 https://github.com/NVIDIA-AI-IOT/jetson-bsp-skills.git /tmp/jetson-bsp-skills
mkdir -p .claude/skills
cp -r /tmp/jetson-bsp-skills/skills/jetson-customize-usb .claude/skills/jetson-customize-usb
Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Jetson Customize Usb in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Jetson Customize Usb on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Jetson Customize Usb is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

  • Loaded only when it is needed

    The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.

  • Switch models mid-chat

    Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Customize USB (per-port enable / disable / role)

Purpose

Enable, disable, or change the role of USB2 / USB3 SS ports on a Jetson Thor (Tegra264) or Orin (Tegra234) custom carrier. Captures per-port wiring (role, max speed, VBUS-EN / OC GPIOs, CC1/CC2 GPIOs for Type-C, USB3 SS UPHY lane), resolves the SS to USB2 companion graph from the in-tree DTB, then renders a self-contained kernel-DT overlay that flips every port action in three places in lockstep (lane status, port status, host xHCI phys + phy-names).

UPHY lane allocation belongs to jetson-customize-uphy. No ODMDATA edit. Output is one commit to the composite custom overlay .dts in the bsp_sources/ hardware repo.

Prerequisites

  • Active profile with reference_devkit: + custom_carrier: blocks.
  • <source.root_path>/Linux_for_Tegra/.git exists (/jetson-init-source).
  • /jetson-derive-carrier has run — carrier flash-conf fork in the overlay tracker.
  • /jetson-customize-uphy has run when any enabled USB3 SS port needs a non-stock UPHY lane allocation. Its JSON sidecar at <workspace>/target-platform/<profile-stem>.jetson-customize-uphy.json is consulted for SS lane allocation.
  • Source-of-truth docs: Adaptation Guide §"Port the Universal Serial Bus", Module Design Guide §USB, SoC TRM (xusb block).
  • When custom_carrier: is present, both documents.custom_carrier_schematic AND documents.custom_carrier_pinmux_xls are REQUIRED. Refuse the run if either is missing — per-port routing (VBUS-EN / OC / CC GPIOs, SS lane wiring, hub fan-out) on a custom carrier cannot be guessed. Reference-devkit-only profiles skip this check.
  • dtc, fdtoverlay on PATH.

Overview

USB on Tegra spans three IP surfaces: the xusb_padctl block (USB2 OTG + USB3 SS PHYs), the tegra-xusb xHCI host controller, and an optional tegra-xudc device controller attached to the single OTG-capable USB2 port (usb2-0).

A per-port flip MUST touch three kernel-DT places in lockstep. Anything less crashes the host xHCI probe and leaves lsusb empty on every port (collateral damage to stock-okay ports):

#PlacePathWhat it controls
1Lane (PHY provider)xusb_padctl/pads/usb<2|3>/lanes/usb<2|3>-NSS / OTG PHY hardware-binding. status="disabled" then lane stops providing a PHY.
2Port (controller-binding)xusb_padctl/ports/usb<2|3>-NPer-port mode (host/device/otg), companion link, VBUS / OC / CC pin refs. status="disabled" then port removed from user-facing topology.
3Host xHCI phys-listbus@0/usb@<addr>.phys + .phy-namesArray of phandles + names the xHCI driver iterates. A ref to a disabled PHY returns -ENODEV and aborts the whole host probe.

NVIDIA's stock-disabled usb3-3 in the Thor base DTB is the canonical pattern — all three places flipped in lockstep.

Two extra rules ride on top of the three-place pattern:

  • Rule A — lane + port pairing. Lane (place 1) and matching port (place 2) MUST flip together.
  • Rule B — companion cascade. xusb_padctl/ports/usb3-N.nvidia,usb2-companion references a USB2 port phandle. Disabling that USB2 without cascading to its SS companion then tegra-xusb: failed to enable PHYs: -19.

Agentic, not table-driven — every port, controller, lane, companion link, phandle, and __symbols__ lookup is resolved at runtime from docs + DTB + carrier pinmap + schematic.

When to invoke

  • The user says "enable USB", "disable USB hub", "configure USB3 SS", "set USB role", "wire VBUS-EN", "tegra-xusb / xudc / dr_mode", or asks to bring up / take down a USB controller on a custom carrier.
  • A USB receptacle on the carrier doesn't enumerate after flash, OR collateral USB damage (lsusb empty after a previous jetson-customize-usb attempt) needs to be fixed.
  • jetson-customize-uphy re-allocated UPHY lanes affecting USB3 SS ports and per-port DT now needs to follow.

Procedure (summary)

The full step-by-step procedure lives in references/procedure.md.

  1. Step 1 — resolve active target + open source-of-truth docs.
  2. Step 2 — build the USB topology + companion graph from the in-tree DTB.
  3. Step 3 — AskUserQuestion for port(s) to enable / disable; surface companion cascade + on-carrier hub fan-out explicitly.
  4. Step 4 — per-port verify (module + carrier + UPHY lane) and capture wiring (VBUS-EN / OC / CC GPIOs via pin_verifier.py).
  5. Step 5 — render the kernel-DT overlay using the three-place pattern, append fragments (usb:padctl, usb:xhci, optional usb:xudc) to the composite custom overlay .dts, run fdtoverlay + the three post-merge invariants, commit to bsp_sources/.
  6. Step 6 — write run-state JSON sidecar (shape in references/run-state-sidecar.md), emit headline, then drive the downstream next-step chain via sequential AskUserQuestion prompts per references/procedure.md Step 6. Never substitute a printed "Next step: …" line for the prompts.

See references/gotchas.md for the load-bearing failure modes.

Limitations

  • Owns kernel-DT overlay only. ODMDATA does not expose a per-port USB status knob; do not edit it.
  • Does NOT allocate UPHY lanes — jetson-customize-uphy owns that. Refuse to commit an SS-enable until uphy run-state shows the lane allocated.
  • Does NOT directly patch the pinmux DTSI — routes SFIO mismatches to /jetson-customize-pinmux set-pin.
  • Does NOT compile the .dtbo or register OVERLAY_DTB_FILE+= — /jetson-build-source owns build + flash-conf registration.
  • Tegra platform invariant: only usb2-0 is OTG-capable; xudc attaches there only. All other USB2 ports and all USB3 SS ports are host-only.

Troubleshooting

  • Empty lsusb on every port, USB-eth at 192.168.55.1 still up: host xHCI bailed; three-place lockstep was broken. Inspect merged DTB; verify post-merge invariants in references/procedure.md Step 5d.
  • tegra-xusb: failed to enable PHYs: -19: companion cascade (Rule B) violated — a USB2 was disabled without its SS companion.
  • no port found or Requested PHY is disabled: Rule A violated — lane status and port status are mismatched.
  • FDT_ERR_NOTFOUND from fdtoverlay: a fragment used target = <&label> for a node whose label is not in __symbols__ (typical for host xHCI / tegra-xudc). Switch to target-path = "/bus@0/usb@<addr>".
  • dtc warning phys_property: cell 0 is not a phandle reference: benign; expected when using raw integer phandles in the host phys override.
  • Port boots but VBUS never asserts: vbus-supply references a regulator parent node that does not exist. Ensure the fixed regulator node is present before referencing it.
  • xHCI binds the wrong port at boot: host phys element order was not preserved. Only elide disabled entries; never reorder kept ones.

References

  • references/procedure.md — full step-by-step procedure.
  • references/gotchas.md — load-bearing failure modes.
  • references/run-state-sidecar.md — run-state JSON shape.
  • references/usb-architecture.md — Tegra USB IP architecture notes (xusb_padctl, tegra-xusb, xudc).
  • references/usb-dt-bindings.md — USB DT binding cheatsheet (lane / port / phys-list shapes).
  • ../../scripts/pin_verifier.py — shared HSIO pin verifier.
  • ../../references/platform_template.yaml — documents: block consumed by Step 1.
  • ../../context/bsp-customization-workflow.md — overlay edit protocol.
  • ../../references/bsp-customization-kernel-dtb.md — composite overlay append protocol.
  • ../jetson-customize-uphy/SKILL.md — sibling skill that owns UPHY lane allocation.
  • ../jetson-customize-pinmux/SKILL.md — sibling skill for VBUS-EN / OC / CC SFIO fixes.
  • ../jetson-derive-carrier/SKILL.md — must run first.
  • ../jetson-init-source/SKILL.md — produces the overlay tracker
    • bsp_sources repo.

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Jetson Customize Usb AI skill do?

Enable/disable Jetson USB2/USB3 SS ports via kernel-DT overlay. Do NOT use for UPHY lane allocation or ODMDATA edits.

Why use Jetson Customize Usb on TypingMind?

Because you install it once and use it with any model. Jetson Customize Usb is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Jetson Customize Usb in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/NVIDIA-AI-IOT/jetson-bsp-skills/tree/main/skills/jetson-customize-usb. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Jetson Customize Usb?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Jetson Customize Usb?

As many as you like. As long as a model supports skills, you can use Jetson Customize Usb with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Jetson Customize Usb AI skill free?

Yes. It is published on GitHub by NVIDIA-AI-IOT under the Apache-2.0 license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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