1. HSB Lattice boards — standalone FPGA board with a Lattice CPNX100 FPGA
2. Leopard Imaging VB1940 — "all-in-one" camera with an integrated Lattice FPGA

program_leopard_cpnx100

program_lattice_cpnx100

1. Run the mandatory token-budget preflight before any remote command, repo checkout, container build, or flash preparation. Estimate the tokens needed to complete all phases, check the user's remaining subscription-plan usage with the best available Claude Code/account usage mechanism, display the estimate and result to the user, and stop if the available budget is insufficient or cannot be verified.
2. Verify that an HSB board is connected to a devkit, that SSH and board connectivity work, read the current FPGA version, and identify the board type (Lattice or VB1940). Try

   hololink enumerate

   first; if it fails (which is expected for FPGA 2407 boards), fall back to

   hololink --force fpga_version

   . For Lattice boards, if all methods fail with the existing repo's container, checkout HSB release repo v2.0.0 and retry using the v2.0.0 container. If that also fails, assume the version is 2407 and continue. For VB1940 boards, ask the user if the version cannot be read.
3. Ask the user for the target FPGA version they want to flash to (or accept "latest"). The available versions depend on the board type.
4. Handle undocumented FPGA versions (applies to both Lattice and VB1940): If the current or target FPGA version is not listed in this skill's supported versions or mapping tables, it may belong to a newer HSB release not yet documented here, or it may be an unreleased development build. Proceed as follows:
   • Check for a newer release: Fetch the public release notes at

     https://github.com/nvidia-holoscan/holoscan-sensor-bridge/blob/main/RELEASE_NOTES.md

     and look for a release that introduces the undocumented FPGA version. If a matching release is found, checkout that release repo on the devkit and use it for flashing following the same rules described below for the detected board type. Also update this skill's mapping tables, supported FPGA versions lists, and transition matrices with the new release and its corresponding FPGA version.
   • Development or unreleased FPGA: If no published release corresponds to the FPGA version, use the existing HSB repo already on the devkit (from

     /hsb-setup

     ) to flash, following the same rules for the detected board type. If the flash fails, report the error and prompt the user for further instructions.
5. Determine the correct flashing procedure and prepare flash scripts and YAML files:
   • Lattice boards:
     1. Read the FPGA version currently flashed on the HSB board. Determine the required HSB release repo based on the flash direction: for upgrades, use the repo corresponding to the target FPGA version; for downgrades, use the repo corresponding to the current FPGA version (see "FPGA version to repo mapping" below). Checkout this repo if it does not already exist on the devkit.
     2. Copy the target FPGA manifest YAML from the relevant

        scripts/

        directory of this skill to the checked-out repo, and patch the file as needed for any missing details (e.g.,

        fpga_uuid

        ).
     3. Determine the flashing procedure:
        • Single-step upgrade: If the current version is 2412 or newer and the target is also 2412 or newer, or if upgrading from any version to exactly 2412. Flash directly from the current version to the target using the repo that corresponds to the target FPGA version (see "FPGA version to repo mapping").
        • Single-step downgrade: If both the current and target versions are 2412 or newer. Flash directly from the current version to the target using the repo that matches the current FPGA version.
        • Two-step downgrade: If the target is older than 2412 (i.e., 2407) and the current version is newer than 2412. Step 1: flash from the current version to 2412 using the repo that matches the current FPGA version. Step 2: flash from 2412 to the target using HSB release repo v2.0.0. Power cycle required between steps. (Special case: if the current version is exactly 2412, only step 2 is needed.)
        • Two-step upgrade: If the current version is older than 2412 (i.e., 2407) and the target is newer than 2412. Step 1: flash from the current version to 2412 using v2.0.0 (which corresponds to target FPGA 2412). Step 2: flash from 2412 to the target using the repo that corresponds to the target FPGA version. Power cycle required between steps.
     4. Read the user guide of the HSB repo being used for flashing and extract the flash command. Always add

        --force

        and

        --accept-eula

        to ensure non-interactive execution inside the container. Note: v2.0.0 places

        --force

        before the subcommand and

        --accept-eula

        after — see "v2.0.0 CLI flag placement" below.
     5. After flashing is complete, clean up all interim HSB release repos that were checked out by this skill and differ from the user's original repo that existed on the devkit before the skill was invoked.
   • VB1940 cameras: Use the existing HSB repo on the devkit directly (no v2.0.0 interim repo needed). Flashing is always single-step. Present the full flashing plan to the user for approval.
6. Execute the flashing procedure:
   • Perform required pre-flash safety checks (ping board, confirm board type and current FPGA version).
   • Run each flash step with full logging; announce the operation before flashing.
   • Require explicit user confirmation before each critical flash and after any required board/camera power cycle.
   • All program commands must be executed inside the demo container (no sudo needed within the container).
   • After flashing, verify the new FPGA version matches the intended target before proceeding.
   • Handle any error or mismatch by stopping the workflow, reporting the state, and offering to clean up.
7. Produce a summary report of the entire procedure with the option to save it.
8. Clean up all flash artifacts so the devkit is ready for the user to checkout any HSB release they need.

• Upgrades: Look up the target FPGA version's YAML Source Release.
• Downgrades: Look up the current FPGA version's YAML Source Release.

Self-updating: If an undocumented FPGA version is encountered, the skill checks the public release notes for a matching HSB release (see "Handling undocumented FPGA versions"). If found, the skill updates the "Supported FPGA versions" tables, the transition matrix, and notes the new release's manifest files.

1. Check for an existing repo: If the user already has an HSB repo on the devkit (from

   /hsb-setup

   ), read its version from the

   VERSION

   file.
2. Determine the required repo: For upgrades, look up the target FPGA version in the mapping table. For downgrades, look up the current FPGA version.
3. Checkout if needed: If the existing repo does not match the required version, clone and checkout the required repo version into a separate directory. The existing repo is left untouched.
4. Two-step case: If a two-step flash is required, both step repos must be available. For two-step downgrade (current > 2412, target = 2407), step 1 uses the current FPGA's repo and step 2 uses v2.0.0. For two-step upgrade (current = 2407, target > 2412), step 1 uses v2.0.0 (target 2412's repo) and step 2 uses the repo corresponding to the final target FPGA version. If any required repo is not already present, it is checked out.

VB1940 note: VB1940 flashing always uses the existing repo on the devkit — the FPGA-to-repo mapping does not apply. The existing repo must be at version v2.3.0 or later. If no existing repo is found, instruct the user to run

/hsb-setup

first.

• BOARD_TYPE

  — the detected board type:

  lattice

  or

  vb1940

• EXISTING_REPO_DIR

  — absolute path to the existing HSB repo (empty if none found)

• EXISTING_REPO_VERSION

  — the repo's release version (e.g.,

  2.3.1

  ), read from the

  VERSION

  file

• FLASH_REPO_DIR

  — absolute path to the repo that will be used for flashing (may differ from

  EXISTING_REPO_DIR

  if a different version was checked out)

• FLASH_REPO_VERSION

  — the version of the flash repo (looked up from the FPGA-to-repo mapping)

• INTERIM_REPOS

  — list of repo directories checked out by this skill (for cleanup in Phase 6)

hsb-setup

• SSH_TARGET

  for the remote login target (e.g.

  nvidia@agx-thor-host

  )

• REMOTE_ROOT

  for the remote working directory where flash workspace will be created

• REMOTE_SUDO

  for privileged commands

• REMOTE_SSH_OPTS

  for additional SSH options

• HSB_PLATFORM

  as an optional platform hint

• Phase 0: Token-budget preflight; verify the user's remaining plan usage can cover a complete flash workflow
• Phase 1: Verify board connectivity, detect board type (Lattice or VB1940), and read current FPGA version
• Phase 2: Select target FPGA version (available versions depend on board type)
• Phase 3: Prepare flash infrastructure and YAML files, present flashing plan for approval
  • Lattice: Checkout the required repo (target FPGA's repo for upgrades, current FPGA's repo for downgrades — if not already present), copy and patch manifest YAML
  • VB1940: Use existing repo directly
• Phase 4: Execute flashing procedure (with power cycle verification)
• Phase 5: Generate summary report (with option to save)
• Phase 6: Clean up flash artifacts

1. Show a phase summary with key outcomes.
2. Prompt the user with

   Proceed to Phase <N+1>? [Y/n]

   and specify what the next phase does. Wait for confirmation before continuing.

--y

--y

• the exact command that failed
• the likely root cause
• what safe action you recommend
• whether the issue is blocking