meta-raspberrypi

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Contents:
=========
1. OpenEmbedded BSP Layer - RaspberryPi
2. Yocto BSP Layer - RaspberryPi
2.A. Compressed deployed files
2.B. GPU memory
2.C. Add purchased license codecs
2.D. Disable overscan
2.E. Set overclocking options
3. Contribution



1. OpenEmbedded BSP Layer - RaspberryPi
=======================================

This is the general hardware specific BSP overlay for the RaspberryPi device.
It should be used with openembedded-core (not old-style org.openembedded.dev).

More information can be found at:

http://www.raspberrypi.org/ (Official Site)
http://www.distant-earth.com/ (My Site)

Build scripts patched to support making a firmware image for the RaspberryPi
with Angstrom can be found at:

http://github.com/Angstrom-distribution/setup-scripts

When not depending on meta-openembedded and not using systemd, you may need to
mask few recipes requiring systemd or other recipes not included in your
distribution of choice.

You can achieve this by adding something like the following to local.conf:

BBMASK = "meta-raspberrypi/recipes-multimedia/libav|\
meta-raspberrypi/recipes-core/systemd"

You can adjust the BBMASK for any .bbappends that your distribution does not
contain recipes for.

The core BSP part of meta-raspberrypi should work with different
OpenEmbedded/Yocto distributions and layer stacks, such as:

* Distro-less (only with OE-Core).
* Angstrom (main focus of testing).
* Yocto/Poky.

This layer in its entirety depends on:

URI: git://git.openembedded.org/openembedded-core
branch: master
revision: HEAD

URI: git://git.openembedded.org/meta-openembedded
branch: master
revision: HEAD



2. Yocto BSP Layer - RaspberryPi
================================

This layer depends on:

URI: git://git.yoctoproject.org/poky
branch: master
revision: HEAD

URI: git://git.openembedded.org/meta-openembedded
branch: master
revision: HEAD

How to use it:

1. source poky/oe-init-build-env rpi-build
2. Add needed layers to bblayers.conf:
- meta-raspberrypi
- meta-openembedded/meta-oe
3 Set MACHINE to raspberrypi in local.conf
4. bitbake rpi-hwup-image
5. dd to a SD card the generated sdimg file (use xzcat if rpi-sdimg.xz is used)
6. Boot your RPI.

2.A. Optional - compressed deployed files:
==========================================
1. Overwrite IMAGE_FSTYPES in local.conf
IMAGE_FSTYPES = "tar.bz2 ext3.xz rpi-sdimg.xz
2. Overwrite SDIMG_ROOTFS_TYPE in local.conf
SDIMG_ROOTFS_TYPE = "ext3.xz"
*Accommodate the values above to your own needs (ex: ext3 / ext4).

2.B. Optional - GPU memory:
===========================
Variable : Details
GPU_MEM : GPU memory in megabyte. Sets the memory split between the ARM and
GPU. ARM gets the remaining memory. Min 16. Default 64.
GPU_MEM_256 : GPU memory in megabyte for the 256MB Raspberry Pi. Ignored by the
512MB RP. Overrides gpu_mem. Max 192. Default not set.
GPU_MEM_512 : GPU memory in megabyte for the 512MB Raspberry Pi. Ignored by the
256MB RP. Overrides gpu_mem. Max 448. Default not set.

2.C.Optional - Add purchased license codecs:
============================================
To add you own licenses use variables KEY_DECODE_MPG2 and KEY_DECODE_WVC1 in
local.conf. Example:
KEY_DECODE_MPG2 = "12345678"
KEY_DECODE_WVC1 = "12345678"
You can supply more licenses separated by comma. Example:
KEY_DECODE_WVC1 = "0x12345678,0xabcdabcd,0x87654321"

2.D. Optional - Disable overscan:
=================================
By default the GPU adds a black border around the video output to compensate for
TVs which cut off part of the image. To disable this set this variable in
local.conf:
DISALE_OVERSCAN = "0"

2.E. Optional - Set overclocking options:
=========================================
The Raspberry PI can be overclocked. As of now overclocking up to the "Turbo
Mode" is officially supported by the raspbery and does not void warranty.
Check the config.txt for a detailed description of options and modes. Example:
# Turbo mode
ARM_FREQ = "1000"
CORE_FREQ = "500"
SDRAM_FREQ = "500"
OVER_VOLTAGE = "6"



3. Contributing
===============

To contribute to this layer you should send the patches for review to the
mailing list.

Mailing list:

https://lists.yoctoproject.org/listinfo/yocto

Source code:

git://git.yoctoproject.org/meta-raspberrypi
http://git.yoctoproject.org/git/meta-raspberrypi
https://github.com/djwillis/meta-raspberrypi

When sending patches, please use something like:

git send-email --to yocto@yoctoproject.org \
--subject-prefix='meta-raspberrypi][PATCH'


Layer maintainers: John Willis
Andrei Gherzan