> For the complete documentation index, see [llms.txt](https://dev.solid-run.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.solid-run.com/solidsense-aiot/solidsense-aiot-rz-v2n.md).

# SolidSense AIOT (RZ/V2N)

## Device Tree Overlays — SolidSense AIOT (RZ/V2N)

The SolidSense AIOT base device tree (`r9a09g056n48-solidsense-aiot.dtb`) describes the bare carrier. Optional hardware — the **Flash Card (J6)** and the **IMX678 MIPI-CSI cameras** on **J8** and **J17** — is enabled at boot by applying one or more device tree overlays via the `FDTOVERLAYS` line in `extlinux/extlinux.conf`. Overlays are built into `freescale/`… *(rzv2n: `renesas/`)* on the boot partition.

The Flash Card carries an LM3645 IR illuminator (driven by `leds-lm3645`, exposed as `/sys/class/leds/ir:flash` and a V4L2 flash sub-device), plus the OPT4001 light sensor and HDC3022 temp/humidity sensor. When a camera overlay is paired with the Flash Card, the IR illuminator is linked to that sensor (`flash-leds`) so the V4L2 pipeline can drive it during capture.

### Choosing an overlay

| Configuration               | `FDTOVERLAYS` entry                                            |
| --------------------------- | -------------------------------------------------------------- |
| Camera **J8** only          | `…/rzv2n-solidsense-aiot-csi-camera-imx678-j8.dtbo`            |
| Camera **J17** only         | `…/rzv2n-solidsense-aiot-csi-camera-imx678-j17.dtbo`           |
| **Dual** cameras J8 + J17   | `…/…-csi-camera-imx678-j8.dtbo …/…-csi-camera-imx678-j17.dtbo` |
| **Flash Card** only         | `…/rzv2n-solidsense-aiot-addon-flash-card.dtbo`                |
| Flash Card + camera **J8**  | `…/rzv2n-solidsense-aiot-addon-flash-card-cam-j8.dtbo`         |
| Flash Card + camera **J17** | `…/rzv2n-solidsense-aiot-addon-flash-card-cam-j17.dtbo`        |

Example `extlinux.conf` line (Flash Card + J8 camera):

```
FDTOVERLAYS ../renesas/rzv2n-solidsense-aiot-addon-flash-card-cam-j8.dtbo
```

Dual cameras (no Flash Card) — apply both single-camera overlays, space-separated:

```
FDTOVERLAYS ../renesas/rzv2n-solidsense-aiot-csi-camera-imx678-j8.dtbo ../renesas/rzv2n-solidsense-aiot-csi-camera-imx678-j17.dtbo
```

{% hint style="info" %}
**Why dual cameras stack but Flash Card + camera does not:** the J8 and J17 camera overlays touch independent nodes, so they can be applied together. A Flash Card + camera combination uses a *single* combined overlay because the camera node references the flash (`flash-leds = <&camera_flash>`), which only resolves when both are in the same overlay.
{% endhint %}

{% hint style="warning" %}
**Flash Card supports a single camera only.** With the Flash Card assembled, use *either* `…-cam-j8` *or* `…-cam-j17` — not both. Dual cameras are only supported when the Flash Card is **not** assembled.
{% endhint %}


---

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