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This patch enables the inclusion of the Pi's overlays. Previously the overlays were not included in the genimage configuration. This patch ensures overlays are included in the sdcard (when enabled) by defaulting to the inclusion of an empty output/images/rpi-firmware/overlays directory in genimage cfg. The Pi's overlays are built with the following config variables: BR2_PACKAGE_RPI_FIRMWARE=y BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTBS=y BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS=y BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y BR2_LINUX_KERNEL_IMAGE_NAME="Image" BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="Image modules dtbs" After building, the dtbo files are present in the output/images/rpi-firmware/overlays directory but not added to the sdcard because they are missing from the genimage cfg file. Signed-off-by: Matt Flax <flatmax@flatmax.org> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> [Arnout: fix indentation, and add comment explaining why an empty directory is created.] Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Raspberry Pi
Intro
=====
These instructions apply to all models of the Raspberry Pi:
- the original models A and B,
- the "enhanced" models A+ and B+,
- the model B2 (aka Raspberry Pi 2)
- the model B3 (aka Raspberry Pi 3).
How to build it
===============
Configure Buildroot
-------------------
There are two RaspberryPi defconfig files in Buildroot, one for each
major variant, which you should base your work on:
For models A, B, A+ or B+:
$ make raspberrypi_defconfig
For model Zero (model A+ in smaller form factor):
$ make raspberrypi0_defconfig
For model 2 B:
$ make raspberrypi2_defconfig
For model 3 B and B+:
$ make raspberrypi3_defconfig
Build the rootfs
----------------
Note: you will need to have access to the network, since Buildroot will
download the packages' sources.
You may now build your rootfs with:
$ make
(This may take a while, consider getting yourself a coffee ;-) )
Result of the build
-------------------
After building, you should obtain this tree:
output/images/
+-- bcm2708-rpi-b.dtb [1]
+-- bcm2708-rpi-b-plus.dtb [1]
+-- bcm2709-rpi-2-b.dtb [1]
+-- bcm2710-rpi-3-b.dtb [1]
+-- bcm2710-rpi-3-b-plus.dtb [1]
+-- boot.vfat
+-- rootfs.ext4
+-- rpi-firmware/
| +-- bootcode.bin
| +-- cmdline.txt
| +-- config.txt
| +-- fixup.dat
| +-- start.elf
| `-- overlays/ [2]
+-- sdcard.img
`-- zImage
[1] Not all of them will be present, depending on the RaspberryPi
model you are using.
[2] Only for the Raspberry Pi 3 Model (overlay pi3-miniuart-bt is needed
to enable the RPi3 serial console otherwise occupied by the bluetooth
chip). Alternative would be to disable the serial console in cmdline.txt
and /etc/inittab.
How to write the SD card
========================
Once the build process is finished you will have an image called "sdcard.img"
in the output/images/ directory.
Copy the bootable "sdcard.img" onto an SD card with "dd":
$ sudo dd if=output/images/sdcard.img of=/dev/sdX
Insert the SDcard into your Raspberry Pi, and power it up. Your new system
should come up now and start two consoles: one on the serial port on
the P1 header, one on the HDMI output where you can login using a USB
keyboard.