Download BSP Artifacts

jetson-download-bsp owns network fetches for the Auto Setup path. It does not extract archives, initialize source trees, register documents, or edit the active target profile. Those remain owned by jetson-init-image, jetson-init-source, and jetson-link-docs.

When to invoke

• /jetson-quick-start selected Auto Setup.
• The user wants NVIDIA BSP artifacts downloaded into the current workspace before running setup skills.

Inputs and outputs

Resolve the active profile per ../../context/target-platform-contract.md. Refuse if no active profile exists.

Follow the shared quick_start_prefill contract. When invoked by /jetson-quick-start, this skill consumes quick_start_prefill.mode and quick_start_prefill.download.bsp_release as the requested release when present. Missing or invalid prefilled values are not fatal, but a concrete release is required before any download starts.

Use the workspace root as the parent of target-platform/. Place files where downstream setup skills already search:

Do not write bsp_image:, source:, or documents: blocks. The next setup skills will register derived metadata after extraction or user confirmation.

Procedure

Resolve target release

Fetch the release list from: https://developer.nvidia.com/embedded/jetson-linux-archive

From the archive and linked release pages, list concrete releases that explicitly support the active platform. Let the user choose a concrete Jetson Linux / L4T release token (R36.4.4, 36.4.4, 38.2, 38.2.1, 38.4, etc.); do not proceed with a family placeholder such as R38.x. A concrete release token is an optional leading R followed by two or three numeric dotted components. Preserve the token exactly as the official page presents it; do not add .0, remove a patch component, or otherwise normalize it. Sort release choices by dotted numeric order descending (newest first), comparing the components that are present; keep source-provided recommendations in descriptions.

Resolve quick_start_prefill.download.bsp_release as follows:

• Concrete and supported: continue with that release.
• Missing, skip, blank, or a family placeholder (R38.x, 38.x): show supported concrete releases and ask the user to choose one.
• Concrete but unsupported or ambiguous: stop before artifact discovery and show the active platform, requested BSP release, supported concrete releases, and source archive or release page.

Never auto-substitute the requested release with a supported release, even when there is only one supported option.

For unsupported or ambiguous prefill, ask with the shared User input prompt style, to choose exactly one click-to-select action:

• pick_supported_release — user selects one supported concrete release.
• confirm_override — user confirms the incompatible release and enters an override reason.
• cancel — stop with no downloads.

Do not continue to "Locate release artifacts" until the selected release is concrete and supported, or the user explicitly confirms override. Record any override reason in the final summary. If the user cancels, stop with no downloads. Do not claim support unless the archive or linked release page explicitly lists the active platform.

Discovery retries

For every artifact WebFetch in "Resolve target release" and "Locate release artifacts" (BSP, rootfs, public_sources.tbz2, x-tools.tbz2, Developer Guide, User Guide), try 3 attempts before marking it missing:

1. Focused prompt — artifact name + file type.
2. Verbatim link dump on the same URL — "list every hyperlink, text and href, no filtering". Accept product-specific names and .html indexes.
3. Verbatim dump on a sibling page — Jetson Linux archive, JetPack downloads, or https://docs.nvidia.com/jetson/archives/r<ver>/.

Only after all 3 fail, route to user-paste / skip. Never fabricate URLs.

Locate release artifacts

Follow links from the selected release page. Never construct NVIDIA download URLs by string concatenation.

Required artifacts:

• Jetson Linux BSP image tarball.
• Tegra Linux sample root filesystem tarball.
• public_sources.tbz2.
• x-tools.tbz2 / Crosstool-NG Toolchain gcc matching the selected BSP release.
• Developer Guide.
• User Guide.

If a guide is not available as a direct file link, accept the release documentation URL as the artifact and record it in the final summary. If the toolchain is listed on a JetPack downloads page instead of the release page, follow the official page link and match the selected BSP release; do not synthesize the URL from a release number. Do not proceed until each required artifact is downloaded, already present at its destination, represented by a URL, or explicitly skipped by the user.

Show the fetch plan

Before changing the workspace, print a plan with:

• selected release and release page URL;
• active platform summary (reference_devkit.name, optional custom_carrier.name, and flash_config);
• source URL and destination path, or documentation URL, for every artifact;
• any existing destination file that will be reused;
• any artifact that requires browser/EULA handling instead of curl.

Default to Download all. Do not ask an extra confirmation when every required artifact is downloadable, already present for reuse, or a documentation URL to record. Print the plan and continue to disk-space verification.

Still stop and ask before side effects in any of these cases:

• the release required an incompatibility override;
• a required artifact is missing and needs user-paste / skip;
• a destination file would be overwritten rather than reused;
• the artifact requires browser/EULA handling;
• disk-space verification fails or cannot be computed safely.

Verify disk space

Sum Content-Length across artifacts to download (curl -sI <url>); refuse if df -B1 --output=avail <workspace> headroom < sum × 1.2. Skip URL-only artifacts.

Download safely

Create destination directories as needed. For direct file links, use a temporary .part path and rename only after success:

mkdir -p "<destination-dir>"
curl -fL --retry 3 --retry-all-errors --retry-delay 5 -o "<destination>.part" "<artifact-url>"
mv "<destination>.part" "<destination>"

If a destination file already exists and is non-empty, reuse it by default after showing its path. Ask before overwriting. If an artifact download fails due to 404, 401/403, EULA/browser authentication, or a network error, stop and show the artifact URL plus expected destination path. Ask the user to download the file manually, skip that artifact, or cancel. Do not synthesize alternate NVIDIA URLs.

Validate filenames

Before finishing, verify the BSP and rootfs tarball filenames contain the exact R<ver> token from the official artifact URL or filename discovered in Step 2. <ver> may have two or three numeric components (R38.2, R38.2.1, R38.4, etc.). Do not infer R38.2.0 from R38.2, and do not assume that a selected two-component release maps to a three-component tarball name:

• Jetson_Linux_R<ver>_aarch64.tbz2
• Tegra_Linux_Sample-Root-Filesystem_R<ver>_aarch64.tbz2

Verify public_sources.tbz2 is a bzip2 tarball when it exists locally:

file -b "<workspace>/Downloads/public_sources.tbz2" | grep -q "bzip2 compressed"

Verify x-tools.tbz2 the same way when it exists locally:

file -b "<workspace>/Downloads/x-tools.tbz2" | grep -q "bzip2 compressed"

Warn, but do not fail, if document filenames differ from the release version; NVIDIA documentation naming is less consistent than tarballs.

Finish

Report the selected release, downloaded/reused/skipped artifacts, and exact local paths. Then hand back to the caller with:

1. /jetson-init-image
2. /jetson-init-source
3. /jetson-link-docs

Gotchas

• Keep this skill download-only; extraction belongs to jetson-init-image and jetson-init-source.
• Put image tarballs in the image root, not Downloads/, because jetson-init-image searches the image root, workspace root, and current directory.
• Put public_sources.tbz2 in Downloads/ because jetson-init-source auto-discovers that path for Branch A.
• Put x-tools.tbz2 in Downloads/ because jetson-init-source auto-extracts that path and writes the resulting source.toolchain prefix.
• The User Guide maps to documents.bsp_user_guide in the profile schema (alongside bsp_developer_guide). jetson-link-docs writes it when the user confirms; this skill only stages the file or URL.

Purpose

Stage the four NVIDIA-shipped artifacts (BSP, sample rootfs, public_sources, x-tools) plus the Developer / User Guides at the exact paths the Setup skills look in, so /jetson-init-image, /jetson-init-source, and /jetson-link-docs can run offline once this skill is done.

Prerequisites

• Active target profile resolved per ../../context/target-platform-contract.md.
• Network access to developer.nvidia.com and the Jetson Linux archive page.
• Workspace layout with the expected Image/, Source/, Downloads/, and Documents/ roots (default workspace shape).

Limitations

• Download-only; never extracts, runs apply_binaries.sh, mounts sources, registers documents, or mutates the active profile.
• Release selection is bounded to entries published on the official Jetson Linux archive; pre-release or internal builds are out of scope.
• No retry / mirror logic — failures are surfaced to the user, not silently retried.

Troubleshooting

• Release page not reachable — check VPN / proxy; do not invent fallback URLs. Stop and report.
• Archive name mismatch with active platform — verify the release declares the active reference devkit; if not, ask the user to pick a supported release or switch target via /jetson-set-target.
• public_sources.tbz2 missing on archive — some releases ship it as a separate page; follow the release-page link rather than guessing the URL.
• Existing files in the destination — refuse to overwrite without confirmation; downloads must be idempotent at the user's discretion.

References

• ../../context/target-platform-contract.md
• ../jetson-quick-start/SKILL.md
• ../jetson-init-image/SKILL.md
• ../jetson-init-source/SKILL.md
• ../jetson-link-docs/SKILL.md
• Jetson Linux archive: https://developer.nvidia.com/embedded/jetson-linux-archive