---
title: "Production programming and release checks"
---

# Production programming and release checks

Programming units on the line with a SEGGER J-Flash project and a CSV production record, and comparing a device's memory with the release ELF, Intel HEX or BIN file.

## Production programming with J-Flash

The line's SEGGER J-Flash project (`.jflash`) opens in the Editor as a read-only view, and runs from it.

### The project view

Open a `.jflash` file. The view shows the J-Flash version that saved it and the file's SHA-256, then:

- **Target**: device, core id, interface, speed before and after the init steps, probe, RAM for the flash loader, data file;
- **Production steps** (what `-auto` does): erase, program, verify, secure, start application, each marked "changes the device" or "cannot be undone" where it does;
- **Serial number**: address, length, next serial and increment;
- **Flash banks**, with option bytes and fuses marked "cannot be undone when programmed";
- the init steps run on connect, and the project's other keys as stored.

### Run a batch

1. Click **Run Production...** in the view, or run **Run J-Flash Production...**.
2. Give the data file and the number of units in this batch.
3. Read the confirmation. It names the device, the project and the data file with their SHA-256, the serial range (for example 10001 to 10010), every change to the device, and the steps that cannot be undone, such as read-out protection.
4. Confirm. For each unit, J-Flash runs on a copy of the project with that unit's serial number: `-jflashlog -openprj -open -auto -exit`.

![The confirmation of a J-Flash production run: device, project and data file with their SHA-256, the serial range, every change and the steps that cannot be undone.](https://neuralinverse.com/docs-images/modules/embedded/jflash-production-confirm.webp)

Each unit appends a line to the CSV production record: time, project and data file with their SHA-256, device, serial number, result and log. The file is `neuralInverse.embedded.jflash.productionRecord`, relative to the first workspace folder; **Open J-Flash Production Record** (or the view's button) opens it.

State: the project reader tested on 8 public projects saved by J-Flash V4.78 to V7.84; the service with a stand-in J-Flash; the kit's per-unit project copy equal to the Editor's in bash and PowerShell 7.4.6; used in the app on Linux. Kit shipped (jlink). **Not yet run against J-Flash, a J-Link or a board**; J-Flash's exit codes, log wording and the meaning of some project keys are unverified.

Agents can list and read J-Flash projects and preview a production run; a run itself (**Run J-Flash Production**) waits for the same confirmation.

## Compare a device with the release file

For a returned unit, or before a release: is the device's flash the release image, and if not, what differs?

1. Start a debug session on the unit (or in the emulator).
2. Run **Compare Device Memory with Release File...**, or right-click an image in the Explorer and choose **Compare with Device Memory**.
3. Choose the ELF, Intel HEX or BIN file. The module reads the same ranges from the device through the session's probe.
4. The result lists the differences by address and by section of the image, and you can save a Markdown report with the file's SHA-256 for the release record.

It never writes to the device.

![The Markdown report of a device memory comparison with an Intel HEX release file, listing the differing bytes by address and section.](https://neuralinverse.com/docs-images/modules/embedded/release-compare-report.webp)

State: verified against QEMU's `netduinoplus2` machine with gdb-multiarch 15.1 on Linux: ELF, HEX and BIN files match, and a changed byte is found in `.text` and checked with objdump; run in the app against QEMU. **Not run on a real board through a probe.** Agents can run the comparison (**Compare Device Memory with Release File**), read-only.