Qt5 (minimal) on Beaglebone, with Yocto[转载]

转载 http://gpupowered.org/node/20

Qt5 (minimal) on Beaglebone, with Yocto

Introduction:

This post publishes the method to build Qt5 for Beaglebone. To build Qt5 for Beaglebone, the below repos are needed:

poky
meta-oe
meta-ti
meta-qt5

Downloading the configuration files:

git clone git://git.yoctoproject.org/poky
cd poky
git clone https://github.com/openembedded/meta-oe
git clone git://git.yoctoproject.org/meta-ti
git clone [email protected]:prabindh/meta-qt5.git

Adding qt5 to minimal image (conf/local.conf):

Add below line to conf/local.conf (notice the space at start of the appended package names)

IMAGE_INSTALL_append = " qtbase qtbase-tools qtbase-plugins"

Setting Beaglebone as target (conf/local.conf):

Specify Beaglebone as target, as below, in conf/local.conf

MACHINE ?= "beaglebone"
BBMASK ?= ".*/meta-ti/recipes-misc/(images|payload)/"

Adding meta-ti and meta-oe layers to Bitbake build system:

Add meta-oe and meta-ti, so that it looks like below in conf/bblayers.conf

BBFILES ?= ""
BBLAYERS ?= " \
${TOPDIR}/../meta \
${TOPDIR}/../meta-yocto \
${TOPDIR}/../meta-yocto-bsp \
${TOPDIR}/../meta-oe/meta-oe \
${TOPDIR}/../meta-ti \
"

Building the image:

source oe-init-build-env
bitbake core-image-minimal

Creating SD card:

The images (MLO, u-boot, dt, uImage, and rootfs) are available at below folder,

<>/poky/build/tmp/deploy/images

Use mkmmc scripts (or any other standard SD format scripts) to burn these images to SD card.

Running the Qt5 examples with minimal plugin:

Boot the Beaglebone, and login in as root.

$>export QT_DEBUG_BACKINGSTORE=1
$>export QT_QPA_PLATFORM=minimal
$>cd /usr/bin/qt5/examples/

UI/widget examples (ex, calculator) can be run and output observed from the png file stored in the same folder.

Yocto build configuration used:

There was an update after this, but below should give a reference.

BB_VERSION = "1.17.1"
BUILD_SYS = "i686-linux"
NATIVELSBSTRING = "Ubuntu-12.04"
TARGET_SYS = "arm-poky-linux-gnueabi"
MACHINE = "beaglebone"
DISTRO = "poky"
DISTRO_VERSION = "1.3+snapshot-20130403"
TUNE_FEATURES = "armv7a vfp neon"
TARGET_FPU = "vfp-neon"
meta
meta-yocto = "master:c0910f26ea0d692c6d22f2e3f87cf710b31fdf0a"
meta-oe = "master:af6c39379dbe6822d1457498e53747ed63bdbb65"
meta-ti = "master:ca0f68d71b08de156c4424324466aab0ebc7296f"
meta-yocto-bsp = "master:c0910f26ea0d692c6d22f2e3f87cf710b31fdf0a"

TODO:

- fonts are not installed to target, so no text appears

- eglfs with virtual/gles2 configuration update

- wayland update

- Qt 5.1 update

- webkit update

- Beaglebone itself runs only at 250 MHz (!) in the default Yocto core-image-minimal. To update with TI scripts for a better performance profile

References:

https://gist.github.com/errordeveloper/4056193
https://github.com/meta-qt5/