kukkimonsuta / meta-raspberrypi Goto Github PK

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Contents:
=========
1. Description
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
    2.F. Optional - Video camera support with V4L2 drivers
    2.G. Images
    2.H. Boot to U-Boot
    2.I. Image with Initramfs
3. Extra apps
    3.A. omxplayer
4. Source code and mirrors
5. Contribution
    5.A. Mailing List
    5.B. Gerrit Review Server
    5.C. Trello Board
6. Maintainers


1. Description
==============

This is the general hardware specific BSP overlay for the RaspberryPi device.

More information can be found at:
                   http://www.raspberrypi.org/ (Official Site)

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.

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

This layer depends on:

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

URI: git://github.com/openembedded/meta-oe.git
layers: meta-multimedia
branch: master
revision: HEAD

How to use it:

1. source poky/oe-init-build-env rpi-build
2. Add needed layer to bblayers.conf:
    - meta-raspberrypi
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"
2. Overwrite SDIMG_ROOTFS_TYPE in local.conf
	SDIMG_ROOTFS_TYPE = "ext3.xz"
3. Overwrite SDIMG_COMPRESSION in local.conf
	SDIMG_COMPRESSION = "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"

2.F. Optional - Video camera support with V4L2 drivers
======================================================
Set this variable to enable support for the video camera (Linux 3.12.4+ required)
VIDEO_CAMERA = "1"

2.G. Images
===========
* rpi-hwup-image
    Hardware up image
* rpi-basic-image
    Based on rpi-hwup-image with some added features (ex: splash)
* rpi-test-image
    Image based on rpi-basic-image which includes most of the packages in this
    layer and some media samples.

2.H. Boot to U-Boot
===================
To have u-boot load kernel image, set in your local.conf
KERNEL_IMAGETYPE = "uImage"

This will make kernel.img be u-boot image which will load uImage.
By default, kernel.img is the actual kernel image (ex. Image).

2.I. Image with Initramfs
=========================
To build an initramfs image :
    * Set this 3 kernel variables (in linux-raspberrypi.inc for example)
        - kernel_configure_variable BLK_DEV_INITRD y
        - kernel_configure_variable INITRAMFS_SOURCE ""
        - kernel_configure_variable RD_GZIP y
    * Set the yocto variables (in linux-raspberrypi.inc for example)
        - INITRAMFS_IMAGE = "<a name for your initramfs image>"
        - INITRAMFS_IMAGE_BUNDLE = "1"
    * Set the meta-rasberrypi variable (in raspberrypi.conf for example)
        - KERNEL_INITRAMFS = "-initramfs"

3. Extra apps
=============

3.A. omxplayer
==============
omxplayer depends on libav which has a commercial license. So in order to be
able to compile omxplayer you will need to whiteflag the commercial license
adding to you local.conf:
LICENSE_FLAGS_WHITELIST = "commercial"


4. Source code and mirrors
==========================

Main repo:
    git://git.yoctoproject.org/meta-raspberrypi
    http://git.yoctoproject.org/git/meta-raspberrypi

Github mirror:
    https://github.com/djwillis/meta-raspberrypi

Gerrit review repo:
    https://review.gherzan.ro:8443/meta-raspberrypi


5. Contributing
===============

5.A. Mailing list
=================
To contribute to this layer you should send the patches for review to the
mailing list.

The patches should be compliant with the openembedded patch guidelines:
http://www.openembedded.org/wiki/Commit_Patch_Message_Guidelines

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

To send changes to mailing list use something like:
    git send-email --to [email protected] \
    --subject-prefix='meta-raspberrypi][PATCH'

OPTIONALLY push changes to gerrit (help maintainers merge and review patches
easier in this way).
    git push ssh://<username>@review.gherzan.ro:29418/meta-raspberrypi
    <local-branch>:refs/for/master
    See 5.B. Gerrit Review Server.

5.B. Gerrit Review Server
=========================
We have a gerrit server configured at review.gherzan.ro. Changes made in gerrit
are merged in git.yoctoproject.org/meta-raspberrypi.

You can setup a gerrit account in less than 2 minutes:
A) Login / Register on https://review.gherzan.ro:8443.
B) Add your PUBLIC key in Settings/SSH Public Keys.
C) Add remote in your local repo:
    git remote add gherzan ssh://<username>@review.gherzan.ro:29418/meta-raspberrypi
D) Push changes to gerrit using:
    git push gherzan <local-branch>:refs/for/master

Please check your spam folder for gerrit messages. Sometimes they end up there.

5.C. Trello Board
=================
A public Trello board is set to manage tasks and bugs. Join us there:
    https://trello.com/b/QsYeVjVe/meta-raspberrypi


6. Maintainers
==============

    John Willis <John.Willis at distant-earth.com>
    Andrei Gherzan <andrei at gherzan.ro>