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  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. Optional - Enable offline compositing support 2.H. Images 2.I. Boot to U-Boot 2.J. 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. * Yocto/Poky (main focus of testing).

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 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:
  3. bitbake rpi-hwup-image
  4. dd to a SD card the generated sdimg file (use xzcat if rpi-sdimg.xz is used)
  5. Boot your RPI.

2.A. Optional - compressed deployed files:

  1. Overwrite IMAGEFSTYPES in local.conf IMAGEFSTYPES = "tar.bz2 ext3.xz"
  2. Overwrite SDIMGROOTFSTYPE in local.conf SDIMGROOTFSTYPE = "ext3.xz"
  3. Overwrite SDIMGCOMPRESSION in local.conf SDIMGCOMPRESSION = "xz" *Accommodate the values above to your own needs (ex: ext3 / ext4).

2.B. Optional - GPU memory:

Variable : Details GPUMEM : GPU memory in megabyte. Sets the memory split between the ARM and GPU. ARM gets the remaining memory. Min 16. Default 64. GPUMEM256 : GPU memory in megabyte for the 256MB Raspberry Pi. Ignored by the 512MB RP. Overrides gpumem. Max 192. Default not set. GPUMEM512 : 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 KEYDECODEMPG2 and KEYDECODEWVC1 in local.conf. Example: KEYDECODEMPG2 = "12345678" KEYDECODEWVC1 = "12345678" You can supply more licenses separated by comma. Example: KEYDECODEWVC1 = "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


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. Optional - Enable offline compositing support

Set this variable to enable support for dispmanx offline compositing DISMANX_OFFLINE = "1"

This will enable the firmware to fall back to off-line compositing of Dispmanx elements. Normally the compositing is done on-line, during scanout, but cannot handle too many elements. With off-line enabled, an off-screen buffer is allocated for compositing. When scene complexity (number and sizes of elements) is high, compositing will happen off-line into the buffer.

Heavily recommended for Wayland/Weston.

See: http://wayland.freedesktop.org/raspberrypi.html

2.H. Images

2.I. 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.J. Image with Initramfs

To build an initramfs image : * Set this 3 kernel variables (in linux-raspberrypi.inc for example) - kernelconfigurevariable BLKDEVINITRD y - kernelconfigurevariable INITRAMFSSOURCE "" - kernelconfigurevariable RDGZIP y * Set the yocto variables (in linux-raspberrypi.inc for example) - INITRAMFSIMAGE = "" - INITRAMFSIMAGEBUNDLE = "1" * Set the meta-rasberrypi variable (in raspberrypi.conf for example) - KERNELINITRAMFS = "-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: LICENSEFLAGSWHITELIST = "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/CommitPatchMessage_Guidelines

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

To send changes to mailing list use something like: git send-email --to yocto@yoctoproject.org \ --subject-prefix='meta-raspberrypi][PATCH'

OPTIONALLY push changes to gerrit (help maintainers merge and review patches easier in this way). git push ssh://@review.gherzan.ro:29418/meta-raspberrypi :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://@review.gherzan.ro:29418/meta-raspberrypi D) Push changes to gerrit using: git push gherzan :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>