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Jetson Customize Uphy

NVIDIAOfficialCreated by Jetson TeamDistributed by NVIDIA

  • Skill
  • Workflow
  • Cloud and DevOps
  • Apache-2.0
  • Medium risk

From the author

Configure Jetson UPHY lane allocation (uphy0/uphy1-config) on Orin/Thor custom carriers. Do NOT use for pinmux or PCIe-only edits.
— the description by Jetson Team

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill automates the configuration of UPHY (Unified PHY) lane allocations on Jetson Orin and Thor platforms. It ensures that carrier-specific hardware routing is correctly reflected in the BPMP DTB via ODMDATA tokens and synchronizes kernel-level device tree overlays for controllers like PCIe, MGBE, and USB. The process is discovery-based, requiring access to the Adaptation Guide, carrier schematics, and pinmux files to ensure accurate lane mapping and prevent boot-time errors.

What it does

  • Parses Adaptation Guide and schematics to identify valid UPHY lane configurations.
  • Generates an atomic ODMDATA commit for the carrier flash configuration.
  • Dispatches to sub-skills to manage kernel-DT overlay fragments for specific controllers.
  • Handles UPHY_CONFIG clearing requirements for specific lane configurations.
  • Validates controller status against stock device tree values to minimize redundant changes.
  • Provides a summary of changes and next-step guidance for flashing and validation.

When to use it

  • When configuring UPHY lane allocation on a custom Jetson carrier board.
  • When remapping PCIe, MGBE, USB3, or UFS controllers on custom hardware.
  • When troubleshooting cold boot failures or BPMP firmware readiness issues.
  • When a UPHY-fed controller fails to enumerate after a system flash.

Advantages

  • Ensures hardware-software alignment by cross-referencing schematics and documentation.
  • Prevents common boot-loop errors by automating the management of controller status tokens.
  • Maintains a clean git history with atomic commits for BSP customizations.
  • Reduces manual error by dynamically discovering configuration options rather than using hard-coded values.

Usage examples

“Configure UPHY lane allocation for my custom Orin carrier board.”
The agent will analyze your carrier schematic and Adaptation Guide to present valid UPHY configuration options, then apply the necessary ODMDATA and DTB overlays.
“My MGBE controller is not enumerating on my new Thor carrier; check the UPHY settings.”
The agent will verify the UPHY lane mapping against your schematic and ensure the correct speed tokens and kernel overlays are applied to resolve the enumeration issue.

Install

  1. Download the skill as a ZIP:

    https://autogineer.com/agent-skills/nvidia/jetson-customize-uphy/download
  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip jetson-customize-uphy.zip -d .agents/skills

Documentation by Jetson Team

Customize UPHY lane allocation

Purpose

Select a UPHY lane allocation on a Jetson custom carrier and edit the carrier flash-conf fork's ODMDATA="..." to apply the chosen uphyX-config-N token(s) (plus the UPHY_CONFIG="" clear required for uphy0-config-6). Kernel-DT alignment per controller is not done here — after the ODMDATA commit lands, this skill dispatches to the per-controller skills (/jetson-customize-pcie, /jetson-customize-mgbe, /jetson-customize-usb), each of which must compare the chosen allocation against the reference kernel DTB node-by-node and emit an overlay fragment only when the K-stock value disagrees with the chosen allocation. Discovery is agentic: options, lanes, and controllers come from the Adaptation Guide, carrier schematic, and Module / SoC TRM at run time — never hard-coded. Every user-visible step renders its data as a markdown table, and the final summary includes a changes-summary table.

Prerequisites

  • Active target-platform profile with reference_devkit: and custom_carrier:.

  • <source.root_path>/Linux_for_Tegra/.git initialized (/jetson-init-source).

  • Forked carrier conf present (/jetson-derive-carrier).

  • Reachable Adaptation Guide via documents.adaptation_guide -> documents.bsp_developer_guide -> web fetch -> Step-1 prompt fallback.

  • When custom_carrier: is present, both documents.custom_carrier_schematic AND documents.custom_carrier_pinmux_xls are REQUIRED. The skill refuses to run if either is missing — routing decisions for the custom carrier cannot be guessed. Reference-devkit-only profiles (no custom_carrier: block) do not require these.

Overview

UPHY (unified PHY) is the shared high-speed PHY pool on Tegra264 (Thor) and Tegra234 (Orin). Lane allocation is selected by ODMDATA tokens (uphy0-config-N, Thor also uphy1-config-N) parsed at flash time by tegraflash_impl_t264.py::tegraflash_update_bpmp_dtb() and written into /uphy/uphy{0,1}-config of the BPMP DTB.

Output is a single atomic ODMDATA commit in <source.root_path>/Linux_for_Tegra/ carrying the chosen uphyX-config-N token(s), the UPHY_CONFIG="" clear (for uphy0-config-6), AND every per-controller ODMDATA token derived from the chosen allocation (pcie@N_status=*, mgbeN-speed-*, USB SS per-port tokens). Sub-skills (/jetson-customize-pcie, /jetson-customize-mgbe, /jetson-customize-usb) own only the kernel-DT overlay fragments — they MUST NOT touch ODMDATA. All commits follow the batched pristine + customization pattern in ../../context/bsp-customization-workflow.md. Upstream BSP at <bsp_image.root_path>/ is never edited.

When to invoke

  • User says "configure UPHY", "uphy lane allocation", "set uphy0-config-N", "change MGBE speed", or asks to remap PCIe / MGBE / USB3 / UFS on a custom carrier.

  • A UPHY-fed controller doesn't enumerate after flash, OR cold boot dies in BL31 SError / BPMP firmware is not ready.

  • A downstream skill reports FMON fault or BPMP-DTB lane mismatch.

Procedure (summary)

Eight steps; full detail in references/procedure.md.

  1. Resolve target + docs. Refuse without active profile, custom carrier, source-tree git, or forked carrier conf. Resolve Adaptation Guide / schematic / Module Design Guide / SoC TRM.

  2. Locate "Configure the UPHY Lane" in the Adaptation Guide (PDF / HTML mirror / WebFetch). Cross-check Module Design Guide + SoC TRM.

  3. Cross-reference the carrier schematic. Cite UPHY net names (MGBE2_TX_P/N, PEX5_LN0+-, etc.). Zero matching nets = unrouted.

  4. Enumerate matching UPHY options. Surface every documented uphy0-config-N (and Thor uphy1-config-N) index.

  5. Ask the user which config (HARD GATE). Print tables first, then AskUserQuestion — one per UPHY surface, plus carrier-routing confirmation if any allocated lane is unrouted. Persist answers to the JSON sidecar (references/run-state-sidecar.md).

  6. Edit carrier flash-conf fork (atomic ODMDATA commit). This skill owns every ODMDATA token for the run. One ODMDATA="..." line, one commit, all tokens. Sub-skills MUST NOT touch ODMDATA.

    Decompile the BPMP DTB at <bsp_image.root_path>/Linux_for_Tegra/bootloader/generic/<BPFDTB_FILE> (BPFDTB_FILE from the carrier conf) to snapshot stock state, then emit tokens in this order:

    a. UPHY surface tokens — every chosen uphyX-config-N (Thor: both surfaces, even if one equals the guide default). Order uphy0 then uphy1; separator ,. b. Per-controller tokens — one per row whose plan-state differs from BPMP-stock. Match-rows get no token (redundant tokens can drop the whole line).

    • PCIe: pcie@N_status=okay|disabled.

    • MGBE: mgbeN-speed-<rate> on allocate, mgbeN-speed-del on disable. FMON arms on the controller's own clocks regardless of UPHY allocation — missing del ⇒ BL31 SError reboot loop. Single most common post-flash failure on Thor.

    • USB SS: per-port tokens when the SoC grammar exposes them. c. UPHY_CONFIG="" clear when uphy0-config-6 is selected (BCT pinmux clear per Adaptation Guide).

  7. Build the per-controller allocation table and dispatch. Derive one row per UPHY-fed controller (PCIe / MGBE / USB SS / UFS) with {class, instance, allocated?, BPMP-stock, K-stock, routed?, Desired K state}. This table drives both (a) Step 6's ODMDATA tokens and (b) the sub-skills' overlay fragments — build it before Step 6 commits.

    Then invoke /jetson-customize-pcie, /jetson-customize-mgbe, and /jetson-customize-usb for kernel-DT overlay fragments only (no ODMDATA edits — Step 6 owns the line). Each sub-skill re-reads K-stock from <bsp_image.root_path>/Linux_for_Tegra/kernel/dtb/tegra<soc>-*-nv.dtb and skips emission when K-stock matches Desired K state. UFS handling stays inline here (no UFS sub-skill).

    Invoke all three whenever their controller class is present on this SoC (e.g. skip MGBE on Orin). Ask the operator first; on yes, run the sub-skill inline.

  8. Summary + next-step chain. Headline, breakdown, choices table (UPHY surface | chosen config | lane summary | UPHY_CONFIG-clear), changes-summary table (file | repo | commit SHA | one-line summary covering this skill's commit + every dispatched sub-skill's commit), then drive the downstream chain (more I/O? build & promote? flash? validate?) via sequential AskUserQuestion prompts per references/procedure.md Step 8. Never substitute a printed "Next step: …" line for the prompts.

Limitations

  • Only supports Tegra234 (Orin) and Tegra264 (Thor) UPHY surfaces.

  • Does not edit pinmux, PCIe-only DT properties absent from BPMP DTB (num-lanes, pcie-mode), or upstream BSP files.

  • Does not flash, build, or promote — chain into /jetson-build-source and downstream skills.

  • Hard-coded option tables are forbidden; if no Adaptation Guide source resolves the skill refuses rather than guessing.

  • Not table-driven across releases: every run re-reads the Guide for the active BSP version.

Troubleshooting

  • Cold boot reboot loop / BL31 plat_setup.c:726 / BPMP firmware is not ready after uphy0-config-6: a later ^UPHY_CONFIG= line in the carrier conf re-overrode the clear. Comment it (see references/procedure.md Step 6).

  • wait-for-device failed at flash, BPMP DTB unchanged: an ODMDATA token had wrong shape (e.g. mgbe0-speed-0). One bad token drops the whole ODMDATA="..." line. Inspect grammar in references/procedure.md.

  • BL31 SError reboot loop after disabling an MGBE: missing mgbeN-speed-del. FMON arms on the controller's own clocks regardless of UPHY allocation.

  • Newly-routed controller doesn't enumerate: stock kernel DTB had status="disabled". Overlay must emit status="okay" (matrix row 4 in references/procedure.md).

  • Pinmap delta=0 but board still misbehaves: UPHY differential pairs are absent from pinmux .xlsm. Drive decisions off schematic net names, not the pinmap.

  • Duplicate pcie@<addr> fragments: another skill (jetson-customize-pcie) already owns that node. Scope this skill to MGBE / UFS / USB3 SS / PCIe-status-only and cite the other overlay.

References

  • references/procedure.md — full eight-step procedure.

  • references/gotchas.md — cross-cutting gotchas.

  • references/run-state-sidecar.md — JSON sidecar schema + idempotency.

  • ../../references/platform_template.yaml — documents: schema.

  • ../../context/bsp-customization-workflow.md — overlay edit protocol.

  • ../../references/bsp-customization-kernel-dtb.md — composite-overlay filename / append protocol.

  • ../jetson-derive-carrier/SKILL.md — produces the conf this skill edits.

  • ../jetson-init-source/SKILL.md — produces the two git repos this skill commits into.

  • ../jetson-generate-kb/SKILL.md — KB consulted for chip family + file locations.

Files

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Requirements and compatibility

Written for: Claude Code

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Names Claude Code tools, Needs Node.js

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Attribution and licence

Created by
Jetson Team
Publisher
NVIDIA (Official)
Distributed by
NVIDIA
Source
NVIDIA/skills · skills/jetson-customize-uphy · commit fce3cca
Licence
Apache License 2.0 (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE-APACHE)
  • ATTRIBUTION.md (written by AutoGineer)
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