layer-contents.md: Update documentation

* Raspberry Pi 3B+ support mentioned
* Add info about linux-firmware-raspbian

Signed-off-by: Andrei Gherzan <andrei@gherzan.com>
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Andrei Gherzan 2018-03-29 14:27:22 +01:00
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@ -11,6 +11,8 @@
* raspberrypi-cm (dummy alias for raspberrypi)
* raspberrypi-cm3 (dummy alias for raspberrypi2)
Note: The raspberrypi3 machines include support for Raspberry Pi 3B+.
## Images
* rpi-test-image
@ -20,3 +22,13 @@
For other uses it's recommended to base images on `core-image-minimal` or
`core-image-base` as appropriate. The old image names (`rpi-hwup-image` and
`rpi-basic-image`) are deprecated.
## WiFi firmware blobs
Be aware that the WiFi firmwares for the supported boards are not provided by
`linux-firmware` but by a custom recipe which only packages the needed blobs
for these boards. This is because the upstream `linux-firmware` doesn't support
or has outdated files for the blobs we need. The recipe
`linux-firmware-raspbian` is based on a fork of `linux-firmware` which
includes everything we need in order to fully support the WiFi hardware. All
machines define `MACHINE_EXTRA_RRECOMMENDS` accordingly.