Raspberry Pi 3

Intro

Minimal Raspberry Pi 3 image based on the standard board package for Raspberry Pi. Drivers for the built in WIFI and Bluetooth chips has been added as packages and are enabled by default. A slimmed defconfig file for the kernel is located in:

board/rpi3/kernel/rpi3_minimal_defconfig

How to build it

Configure Buildroot

A defconfig file for Raspberry Pi 3 has been created which you should base your work on. Load it by executing:

$ make rpi3_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/
+-- bcm2710-rpi-3-b.dtb
+-- boot.vfat
+-- kernel-marked/zImage        [1]
+-- rootfs.ext4
+-- rpi-firmware/
|   +-- bootcode.bin
|   +-- cmdline.txt
|   +-- config.txt
|   +-- fixup.dat
|   `-- start.elf
+-- sdcard.img
`-- zImage

[1] This is the mkknlimg DT-marked kernel.

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.

Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation.

The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html

To build and use the buildroot stuff, do the following:

1. run 'make menuconfig'
2. select the target architecture and the packages you wish to compile
3. run 'make'
4. wait while it compiles
5. find the kernel, bootloader, root filesystem, etc. in output/images

You do not need to be root to build or run buildroot. Have fun!

Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations.

Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: [email protected] You can also find us on #buildroot on Freenode IRC.

If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches