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# BSP layer for updating Raspberry Pi with OSTree
OSTree bootloader integration for Raspberry Pi. Add it to BBLAYERS when using [meta-updater](https://github.com/advancedtelematic/meta-updater) with [Raspberry Pi](https://github.com/agherzan/meta-raspberrypi).
For more documentation on using this layer and [HERE OTA Connect](https://connect.ota.here.com/), please see the [OTA Connect documentation portal](https://docs.ota.here.com/), in particular the guide on [building a Raspberry Pi image](https://docs.ota.here.com/ota-client/latest/build-raspberry.html).
## Device tree configuration
The Raspberry Pi firmware allows customization of the device tree with special entries in `/boot/config.txt`:
<https://www.raspberrypi.org/documentation/configuration/device-tree.md>.
This is not supported in this form when using meta-updater, as the device tree and eventual overlays are managed separately via u-boot and ostree.
Thus, you will have to make the necessary changes directly in yocto and either:
- patch the kernel sources to modify source dts
- patch the kernel sources to add overlay sources and add the corresponding binaries in `KERNEL_DEVICETREE`
- use a customized complete dtb and declare it with `EXTERNAL_KERNEL_DEVICETREE`
You can see examples of the first two approaches in [the linux-raspberrypi bbappend](recipes-kernel/linux/linux-raspberrypi_%.bbappend).
## Wi-Fi enablement for Raspberry Pi
| Name | Default | Description |
|---|---|---|
| RPI_WIFI_ENABLE | "0" | A flag to enable ("1") or disable "0" WiFi support (drivers and configuration) |
| RPI_WIFI_SSID | N/A| ID of a wireless network to connect to. Mandatory if RPI_WIFI_ENABLE is "1" |
| RPI_WIFI_PWD | N/A | Password for a connection to a wireless network |
|
