Jetson Customize Pcie

NVIDIAOfficialCreated by Jetson TeamDistributed by NVIDIA

Skill
Workflow
Software development
Apache-2.0
Medium risk

From the author

Per-controller PCIe enable / disable / lanes / link-speed for a Jetson Thor or Orin custom carrier via ODMDATA + kernel-DT overlay. Do NOT use for UPHY lane allocation or endpoint-mode bring-up.

— the description by Jetson Team

AutoGineer summary

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

This skill manages the per-controller configuration for PCIe on Jetson Thor and Orin platforms. It operates by generating kernel-DT overlay fragments to define controller status, lane width, and link speed. It ensures consistency between the kernel device tree and the BPMP-side ODMDATA settings, which are managed by the sibling jetson-customize-uphy skill. The process involves topology analysis, pin verification against carrier schematics, and the generation of overlay commits for the BSP source repository.

What it does

Analyzes PCIe topology differences between reference devkits and custom carriers.
Verifies required PCIe sideband signals (CLKREQ, RST) against carrier pinmaps and schematics.
Generates kernel-DT overlay fragments to enable or configure PCIe controllers.
Performs consistency checks between kernel-DT overlays and ODMDATA settings.
Maintains a run-state JSON sidecar to track configuration history.
Integrates with the broader BSP customization workflow for Jetson platforms.

When to use it

When configuring PCIe controllers on a custom Jetson carrier board.
When a PCIe slot or M.2 receptacle fails to enumerate after flashing.
When PCIe links train at incorrect widths or speeds.
After running jetson-customize-uphy to reallocate lanes across controllers.

Advantages

Ensures hardware-software alignment through schematic and pinmap verification.
Prevents configuration drift by cross-checking ODMDATA and kernel-DT settings.
Automates the creation of complex kernel-DT overlay fragments.
Provides a structured, repeatable workflow for custom carrier bring-up.

Usage examples

“Configure PCIe controller C3 for my custom Orin carrier.”: The agent will analyze the current UPHY state, verify the carrier pinmap for C3, and generate the necessary kernel-DT overlay fragment to enable the controller.
“My M.2 slot is training at x1 speed instead of x4, please fix it.”: The agent will compare the current kernel-DT configuration against the carrier schematic and UPHY allocation, then update the overlay to set the correct lane width.

Install

Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/nvidia/jetson-customize-pcie/download

Unzip it into the cross-client skills folder of your project:

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

Documentation by Jetson Team

Customize PCIe (per-controller status / lanes / speed)

Overview

PCIe on Tegra264 (Thor, [email protected]) and Tegra234 (Orin, [email protected]) is split across multiple controllers that share the UPHY lane pool with USB3 / MGBE / UFS. Each controller's runtime behavior is determined by two surfaces, both required:

Surface	Target	Authoritative for
ODMDATA `pcie@N_status=…` (+ `pcie@N_max-link-speed`, `pcie@N_pcie-mode`, `pcie@N_clk-scheme`, `pcie-cN-endpoint-enable`)	`/pcie/pcie@N` in BPMP DTB	UPHY lane power, refclk gating, controller-side power rails
Kernel-DT overlay on `&pcieN`	`/bus@0/pcie@<addr>` in kernel DTB	Kernel probe, lane width, link speed, RC/EP mode

Skipping the kernel overlay on a disable lets the kernel probe a powered-down PHY (link timeouts in dmesg). Skipping the ODMDATA token on a disable leaves BPMP holding the PHY hot.

Agentic, not table-driven — no controller table, no questions.json. Every controller, lane width, schematic-routed receptacle, and authoritative DT node address is discovered at runtime from the docs + DTB + carrier pinmap.

The output is a kernel-DT overlay commit only. Per-controller fragment@N blocks are appended to the composite custom overlay .dts per ../../references/bsp-customization-kernel-dtb.md and committed to the bsp_sources/ hardware repo. /jetson-build-source compiles the composite to .dtbo and owns its Makefile + flash-conf registration.

This skill MUST NOT edit ODMDATA="...". All ODMDATA tokens (pcie@N_status=…, pcie@N_max-link-speed, pcie@N_pcie-mode, pcie@N_clk-scheme, pcie-cN-endpoint-enable, plus the uphyX-config-N surface tokens and UPHY_CONFIG="" clear) are emitted by /jetson-customize-uphy in a single atomic commit on the carrier flash-conf fork. The allocation table this skill consumes from the UPHY sidecar already tells the operator which controllers are okay / disabled / per-lane sized; this skill only translates that table into kernel-DT overlay fragments and verifies that the overlay agrees with the ODMDATA already committed by customize-uphy (consistency check in Step 8 — disagreement is reported, not silently fixed).

When to invoke

The user says "configure PCIe", "enable PCIe controller", "set PCIe num-lanes", "change PCIe link speed", or asks to flip a pcie@N_status token.
A specific PCIe slot or M.2 receptacle doesn't enumerate after flash, OR the link trains at the wrong width / speed.
jetson-customize-uphy ran and re-allocated lanes across PCIe controllers (e.g. switched from uphy0-config-7 to uphy0-config-6 enabling PCIe C3); the per-controller side now needs to be brought up.
jetson-customize-mgbe reports the QSFP path is wired but the kernel doesn't probe its PCIe-side companion (rare; XFI configurations).

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 is in the overlay tracker.
/jetson-customize-uphy has run — its JSON sidecar at <workspace>/target-platform/<profile-stem>.jetson-customize-uphy.json drives the per-controller enable decision.
Source-of-truth docs registered or supplied at prompt: Adaptation Guide, Module Design Guide, SoC TRM.
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 — routing on a custom carrier cannot be guessed. Reference-devkit-only profiles skip this check.
dtc on PATH.

Procedure (summary)

Full step-by-step walkthrough lives in references/procedure.md. High-level flow:

Resolve active target + open source-of-truth documents (incl. <carrier-pinmap>, <ref-dtb>, <uphy-state>). Refuse if <uphy-state> is missing.
Diff PCIe topology — devkit vs custom carrier — by decompiling <ref-dtb> and grepping the schematic for PEX<N>_* net labels.
AskUserQuestion (multiSelect) — which controllers to customize.
Per-controller verification: pinmap + schematic + pin_verifier.py for PE<N>_CLKREQ_L, PE<N>_RST_L, optional PE<N>_WAKE_L.
Auto-derive per-controller plan (enable from <uphy-state>, lanes / speed from Adaptation Guide, mode hard-pinned to "rc") → mandatory confirm-or-customize gate.
Append per-controller fragment@N blocks (marker /* custom-bsp: pcie:pcie@<addr> */) to the composite custom overlay .dts in bsp_sources/. Pre-flight dtc + fdtoverlay. Commit via the workflow's preview gate. Do not edit ODMDATA — /jetson-customize-uphy already emitted pcie@N_status=…, pcie@N_max-link-speed, pcie@N_pcie-mode, pcie@N_clk-scheme, and pcie-cN-endpoint-enable in its single atomic ODMDATA commit. This skill only translates the per-controller plan into kernel-DT overlay fragments.
(Step folded into Step 6 — overlay-only emission.)
Cross-check ODMDATA vs overlay consistency. On a contradictory row, stop and ask the user how to recover the two commits. Never run git reset --hard autonomously.
Write run-state JSON sidecar at <workspace>/target-platform/<profile-stem>.jetson-customize-pcie.json
- summary, then drive the downstream next-step chain via sequential AskUserQuestion prompts per references/procedure.md Step 9. Never substitute a printed "Next step: …" line for the prompts.

Limitations

Mode hard-pinned to RC. Endpoint mode is only emitted when the operator passes mode_override="ep" in Step 5c.
enable is derived, not asked. UPHY-allocated controllers are mandatorily okay; non-allocated are mandatorily disabled.
No upstream BSP edits. Output lands in Linux_for_Tegra/ + bsp_sources/ only.
Pre-flight overlay merge is a sanity check, not the production build. /jetson-build-source is authoritative.
Flash-conf overlay registration is out of scope. Owned by /jetson-build-source Step 5.0a.

Troubleshooting

<uphy-state> missing → run /jetson-customize-uphy first.
Slot doesn't enumerate after flash → check dmesg | grep pcie; re-verify ODMDATA pcie@<N>_status=okay and the overlay fragment agree (Step 8 table in references/procedure.md).
Link trains at wrong width → confirm UPHY config in <uphy-state> allocates the expected lane count; the kernel fragment's num-lanes must match.
compatible mismatch → fix the composite root, not the fragment. UEFI plugin-manager silently skips on mismatch.
Contradictory ODMDATA-vs-overlay row → ask the user; do not auto-git reset --hard. See gotchas.
Common pitfalls — see references/gotchas.md (RC pinning, node- address sourcing, stock-disabled controllers, intra-file handoff with jetson-customize-uphy).

References

references/procedure.md — full nine- step procedure (topology diff, plan derivation, overlay append, ODMDATA cross-check, sidecar).
references/gotchas.md — failure modes
- invariants (RC pinning, address sourcing, BPMP handoff).
../../scripts/pin_verifier.py — shared HSIO pin verifier (Step 4).
../../references/platform_template.yaml — documents: block consumed by Step 1.
../../context/bsp-customization-workflow.md — overlay edit protocol + commit message preview gate.
../../references/bsp-customization-kernel-dtb.md — composite overlay filename / skeleton / append protocol.
../jetson-customize-uphy/SKILL.md — sibling skill that owns UPHY lane allocation; its sidecar drives the per-controller enable decision.
../jetson-customize-pinmux/SKILL.md — sibling skill invoked by Step 4 (with operator confirmation) to fix HSIO pin SFIO mismatches.
../jetson-customize-mgbe/SKILL.md — sibling for MGBE controllers; shares the two-surface (ODMDATA
- overlay) pattern.
../jetson-derive-carrier/SKILL.md — must run first; produces the carrier flash-conf fork edited in Step 6.
../jetson-init-source/SKILL.md — produces the overlay tracker + bsp_sources repo this skill commits into.

Files

ATTRIBUTION.mdAdded by AutoGineer926 B
BENCHMARK.md3.7 KiB
LICENSELicence file added by AutoGineer11.2 KiB
SKILL.md9.1 KiB
evals/evals.json6.9 KiB
references/gotchas.md2.3 KiB
references/procedure.md14.8 KiB
skill-card.md3.7 KiB
skill.oms.sig4.9 KiB

evals/evals.json

[
  {
    "id": "jetson-customize-pcie-001",
    "question": "/jetson-customize-uphy just switched my Thor carrier from uphy0-config-7 to uphy0-config-6, enabling PCIe C3 with a 4-lane Gen4 slot. Now bring up the per-controller side via /jetson-customize-pcie.",
    "expected_skill": "jetson-customize-pcie",
    "expected_script": null,
    "ground_truth": "Run /jetson-customize-pcie. Step 1 resolves the active target and opens the carrier pinmap, reference DTB and <uphy-state> sidecar — refuse if <uphy-state> is missing — and require both documents.custom_carrier_schematic AND documents.custom_carrier_pinmux_xls when custom_carrier: is present. Step 2 diffs the PCIe topology by decompiling <ref-dtb> and grepping the schematic for PEX<N>_* net labels. Step 3 issues an AskUserQuestion (multiSelect) for which controllers to customize. Step 4 runs pin_verifier.py for PE<N>_CLKREQ_L, PE<N>_RST_L and optional PE<N>_WAKE_L; mismatches route (with operator confirmation) to /jetson-customize-pinmux. Step 5 auto-derives the per-controller plan: enable from <uphy-state> (mandatorily okay for UPHY-allocated, mandatorily disabled otherwise), lanes/speed from the Adaptation Guide, mode hard-pinned to 'rc' (only emit 'ep' when the operator passes mode_override='ep'), then runs the confirm-or-customize gate. Step 6 appends per-controller fragment@N blocks marked /* custom-bsp: pcie:pcie@<addr> */ into the composite custom overlay .dts in bsp_sources/ per references/bsp-customization-kernel-dtb.md, runs the dtc + fdtoverlay pre-flight and commits via the workflow's preview gate. The skill MUST NOT edit ODMDATA — pcie@N_status=…, pcie@N_max-link-speed, pcie@N_pcie-mode, pcie@N_clk-scheme and pcie-cN-endpoint-enable are owned by /jetson-customize-uphy in its single atomic ODMDATA commit. Step 8 cross-checks ODMDATA vs overlay consistency and on contradiction stops to ask the user — never running 'git reset --hard' autonomously. Step 9 writes <profile-stem>.jetson-customize-pcie.json and drives the downstream next-step chain via sequential AskUserQuestion prompts. /jetson-build-source compiles the composite .dtbo and owns OVERLAY_DTB_FILE+= registration.",
    "expected_behavior": [
      "Read skills/jetson-customize-pcie/SKILL.md",
      "Step 1: validate active profile with reference_devkit + custom_carrier and refuse if <uphy-state> at <workspace>/target-platform/<profile-stem>.jetson-customize-uphy.json is missing; require both documents.custom_carrier_schematic and documents.custom_carrier_pinmux_xls",
      "Step 2: diff PCIe topology — devkit vs custom carrier — by decompiling <ref-dtb> and grepping the schematic for PEX<N>_* net labels",
      "Step 3: AskUserQuestion (multiSelect) for which controllers to customize",
      "Step 4: run pin_verifier.py for PE<N>_CLKREQ_L, PE<N>_RST_L and optional PE<N>_WAKE_L; route mismatches (with operator confirmation) to /jetson-customize-pinmux",
      "Step 5: derive per-controller plan from <uphy-state> (UPHY-allocated => okay, non-allocated => disabled), pull lanes/speed from the Adaptation Guide, hard-pin mode to 'rc' (only 'ep' on explicit mode_override), then run the confirm-or-customize gate",
      "Step 6: append per-controller fragment@N blocks marked /* custom-bsp: pcie:pcie@<addr> */ into the composite custom overlay .dts in bsp_sources/, run dtc + fdtoverlay pre-flight and commit via the preview gate",
      "Do NOT edit ODMDATA — pcie@N_status, pcie@N_max-link-speed, pcie@N_pcie-mode, pcie@N_clk-scheme and pcie-cN-endpoint-enable are owned by /jetson-customize-uphy",
      "Step 8: cross-check ODMDATA vs overlay consistency; on contradiction stop and ask the operator, never run 'git reset --hard' autonomously",
      "Step 9: write <workspace>/target-platform/<profile-stem>.jetson-customize-pcie.json and drive the downstream chain via sequential AskUserQuestion prompts; hand off to /jetson-build-source for composite .dtbo compilation and OVERLAY_DTB_FILE+= registration"
    ]
  },
  {
    "id": "jetson-customize-pcie-002",
    "question": "After /jetson-customize-pcie my PCIe slot enumerates but the link trains at x2 instead of the expected x4, and dmesg shows pcie controller link timeouts on a controller I thought I disabled. What's going on?",
    "expected_skill": "jetson-customize-pcie",
    "expected_script": null,
    "ground_truth": "Two-surface mismatch. Each PCIe controller's runtime behavior is determined by both ODMDATA (BPMP DTB /pcie/pcie@N: UPHY lane power, refclk gating, controller-side rails) and the kernel-DT overlay on &pcieN (kernel probe, lane width, link speed, RC/EP mode); skipping the kernel overlay on a disable lets the kernel probe a powered-down PHY (the link timeouts you see in dmesg), and skipping the ODMDATA token on a disable leaves BPMP holding the PHY hot. For the x2-instead-of-x4 case, confirm /jetson-customize-uphy's <uphy-state> sidecar allocates the expected lane count for that controller — the kernel fragment's num-lanes must match. For the link timeouts, ensure the kernel-DT overlay fragment for the disabled controller is present (status=\"disabled\") in the composite custom overlay .dts; do not rely on ODMDATA alone. Run Step 8's ODMDATA-vs-overlay consistency cross-check; on a contradictory row STOP and ask the user how to recover the two commits — never run 'git reset --hard' autonomously. Also check the composite overlay root compatible — UEFI plugin-manager silently skips on mismatch; fix the composite root, not the fragment. All edits stay in <source.root_path>/Linux_for_Tegra/ and <source.root_path>/bsp_sources/.",
    "expected_behavior": [
      "Read skills/jetson-customize-pcie/SKILL.md and consult the Overview two-surface table plus the Troubleshooting list",
      "Recognize the two-surface invariant: ODMDATA owns UPHY lane power/refclk/rails on /pcie/pcie@N in BPMP DTB, the kernel-DT overlay on &pcieN owns kernel probe/lane width/link speed/RC-EP mode — both required",
      "Diagnose the link timeouts as a missing kernel-DT overlay status=\"disabled\" fragment letting the kernel probe a powered-down PHY",
      "Diagnose the x2 vs x4 link-width as <uphy-state>'s allocation not matching the kernel fragment's num-lanes; confirm UPHY config in <uphy-state> allocates the expected lane count and that num-lanes matches",
      "Run Step 8's ODMDATA-vs-overlay consistency cross-check; on a contradictory row stop and ask the user how to recover the two commits — never auto-run 'git reset --hard'",
      "Sanity-check the composite overlay root compatible (fix the composite root, not the fragment) — UEFI plugin-manager silently skips on mismatch",
      "Do NOT edit ODMDATA from this skill (owned by /jetson-customize-uphy); re-run /jetson-customize-uphy if the ODMDATA side needs to change",
      "Re-emit the per-controller /* custom-bsp: pcie:pcie@<addr> */ fragments via Step 6 with dtc + fdtoverlay pre-flight, refresh <profile-stem>.jetson-customize-pcie.json and hand off to /jetson-build-source"
    ]
  }
]

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

Security

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Attribution and licence

Created by

Jetson Team

Publisher

NVIDIA (Official)

Distributed by

NVIDIA

Source

NVIDIA/skills · skills/jetson-customize-pcie · commit fce3cca

Licence

Apache License 2.0 (redistribution allowed)

LICENSE (added by AutoGineer from LICENSE-APACHE)
ATTRIBUTION.md (written by AutoGineer)

Synced

2026-11-08

AutoGineer is not affiliated with or endorsed by Jetson Team or NVIDIA.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download jetson-customize-pcie.zip