jetson-print-bsp-info

Prints a concise summary of a Jetson Linux_for_Tegra (BSP) tree on the host PC.

This skill is intended as a reference example for the jetson-bsp-skills repo and the NVIDIA-wide skills CI. It performs read-only inspection — no flashing, no rootfs changes.

Purpose

Capture a baseline snapshot of a Linux_for_Tegra BSP tree (release, board configs, rootfs state) before flashing, so issues like "wrong L4T version" or "rootfs never populated" are caught early.

When to use

• A user has unpacked a Jetson BSP tarball and wants to confirm the L4T version, supported boards, and rootfs state before flashing.
• You need a quick sanity check that a Linux_for_Tegra/ directory looks valid (expected scripts and config files present).

Prerequisites

• Running on the host PC (Linux), not on the Jetson target.
• A Linux_for_Tegra/ directory extracted from a Jetson BSP tarball.
• Standard CLIs available: ls, head, cat, paste, sed.

Inputs

• L4T_ROOT (optional): absolute path to the Linux_for_Tegra/ directory. If unset, use the current working directory.

Instructions

Run each step in order and print the captured values into the report shown under Output format.

1. Resolve L4T_ROOT and validate the directory is a Linux_for_Tegra root — exit early otherwise. flash.sh and nv_tegra/ are the two anchor artifacts that every BSP ships:

   L4T_ROOT="${L4T_ROOT:-$PWD}"
   if [ ! -f "$L4T_ROOT/flash.sh" ] || [ ! -d "$L4T_ROOT/nv_tegra" ]; then
     echo "Not a Linux_for_Tegra root: '$L4T_ROOT' (missing flash.sh or nv_tegra/)"
     exit 1
   fi
   echo "$L4T_ROOT"
   

2. Extract the L4T release header line. The canonical host-side location is nv_tegra/nv_tegra_release; the same file is copied into the rootfs by apply_binaries.sh. Only the first line is useful — the rest is a long list of library SHAs:

   head -1 "$L4T_ROOT/nv_tegra/nv_tegra_release" 2>/dev/null \
     || head -1 "$L4T_ROOT/rootfs/etc/nv_tegra_release" 2>/dev/null \
     || echo "L4T release info not found"
   

3. List supported board config files and join them onto one comma-separated line:

   (cd "$L4T_ROOT" && ls *.conf 2>/dev/null) | paste -sd, -
   

4. Check whether the rootfs has been populated. An empty rootfs/ means apply_binaries.sh has not been run yet:

   if [ -f "$L4T_ROOT/rootfs/etc/passwd" ]; then
     echo "populated"
   else
     echo "empty"
   fi
   

Output format

Print a short report with these sections, one line each where possible:

L4T root:        <path>
L4T release:     <release header line>
Board configs:   <comma-separated list>
Rootfs:          populated | empty

Examples

Example output on an Orin AGX BSP (L4T R36):

L4T root:        $HOME/Linux_for_Tegra
L4T release:     # R36 (release), REVISION: 3.0
Board configs:   jetson-agx-orin-devkit.conf,jetson-orin-nano-devkit.conf
Rootfs:          populated

Example output on a freshly untarred BSP where apply_binaries.sh has not been run yet:

L4T root:        /tmp/Linux_for_Tegra
L4T release:     # R39 (release), REVISION: 0.0
Board configs:   jetson-agx-thor-devkit.conf
Rootfs:          empty

Error handling

Each command falls back to a clearly labeled "... not found" string if the underlying file is missing — the skill never errors out mid-report. If L4T_ROOT does not contain flash.sh and nv_tegra/, exit early with a clear "not a Linux_for_Tegra root" message rather than printing misleading info.

Limitations

• Read-only inspection only — does not validate signatures, kernel images, or device-tree overlays.
• Only checks the presence of rootfs/etc/passwd as a populated-rootfs proxy; will not detect a half-populated rootfs.
• Lists all *.conf board configs in L4T_ROOT/; does not try to infer which one the user intends to flash.

Troubleshooting

• Error: Not a Linux_for_Tegra root: '...' (missing flash.sh or nv_tegra/)Cause: L4T_ROOT points at a parent directory, an extracted rootfs, or an unrelated path. Solution: Point L4T_ROOT at the directory that contains flash.sh (typically Linux_for_Tegra/).
• Error: L4T release info not foundCause: Neither nv_tegra/nv_tegra_release nor rootfs/etc/nv_tegra_release exists — the BSP tarball may be incomplete or apply_binaries.sh was never run. Solution: Re-extract the BSP tarball or run apply_binaries.sh to populate the rootfs.

Notes

• Do not modify any files. This skill is read-only.
• If multiple board config files exist, list all of them — do not try to guess which one the user intends to flash.