yocto环境学习--新建层

1.新建层使用命令 yocto-layer create layer_name
yangzhiwen@yzw-kingsee:yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp$ cd sources/
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources$ ls
base  meta-browser  meta-daiane  meta-fsl-arm  meta-fsl-arm-extra  meta-fsl-bsp-release  meta-fsl-demos  meta-openembedded  meta-qt5  poky
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources$ yocto-layer create elmo
Please enter the layer priority you'd like to use for the layer: [default: 6]                         #优先级
Would you like to have an example recipe created? (y/n) [default: n] y                                #是否包含一个样例
Please enter the name you'd like to use for your example recipe: [default: example] elmo-example    #样例名字
Would you like to have an example bbappend file created? (y/n) [default: n] y                        #是否创建样例的bbappend文件
Please enter the name you'd like to use for your bbappend file: [default: example] elmo-example        #样例的bbappend名字
Please enter the version number you'd like to use for your bbappend file (this should match the recipe you're appending to): [default: 0.1]    #版本号

New layer created in meta-elmo.

Don't forget to add it to your BBLAYERS (for details see meta-elmo\README).
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources$


2.到此为止，已经建好层了，并且已经有个Demo,先睹为快
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources$ ls
base  meta-browser  meta-daiane  meta-elmo  meta-fsl-arm  meta-fsl-arm-extra  meta-fsl-bsp-release  meta-fsl-demos  meta-openembedded  meta-qt5  poky
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources$ cd meta-elmo/
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo$ ls
conf  COPYING.MIT  README  recipes-example  recipes-example-bbappend
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo$ cd recipes-example/example/
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo/recipes-example/example$ ls
elmo-example-0.1  elmo-example_0.1.bb
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo/recipes-example/example$ ls elmo-example-0.1/
example.patch  helloworld.c
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo/recipes-example/example$ cat elmo-example-0.1/helloworld.c

#include

int main(int argc, char **argv)
{
    printf("Hello World!\n");
    return 0;

}

yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo/recipes-example/example$ cat elmo-example-0.1/example.patch
#
# This is a non-functional placeholder file, here for example purposes
# only.
#
# If you had a patch for your recipe, you'd put it in this directory
# and reference it from your recipe's SRC_URI:
#
#  SRC_URI += "file://example.patch"
#
# Note that you could also rename the directory containing this patch
# to remove the version number or simply rename it 'files'.  Doing so
# allows you to use the same directory for multiple recipes.
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo/recipes-example/example$
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo/recipes-example/example$ cat elmo-example_0.1.bb
#
# This file was derived from the 'Hello World!' example recipe in the
# Yocto Project Development Manual.
#

DESCRIPTION = "Simple helloworld application"
SECTION = "examples"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
PR = "r0"

SRC_URI = "file://helloworld.c"

S = "${WORKDIR}"

do_compile() {
             ${CC} helloworld.c -o helloworld
}

do_install() {
             install -d ${D}${bindir}
             install -m 0755 helloworld ${D}${bindir}
}

3.编译我们所建层的recipes,方法： bitbake bbappend_name
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/sources/meta-elmo/recipes-example/example$ cd ../../../../build_qt5
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ bitbake elmo-example
Loading cache: 100% |###################################################################################################################################| ETA:  00:00:00
Loaded 2566 entries from dependency cache.
Parsing recipes: 100% |#################################################################################################################################| Time: 00:00:01
Parsing of 2049 .bb files complete (2028 cached, 21 parsed). 2564 targets, 157 skipped, 3 masked, 0 errors.
ERROR: Nothing PROVIDES 'elmo-example'

Summary: There was 1 ERROR message shown, returning a non-zero exit code.

报错找不到我们的elmo-example,原因是我们没有加进fsl-image-qt5,先加进去
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ vi conf/bblayers.conf

LCONF_VERSION = "6"

BBPATH = "${TOPDIR}"
BSPDIR := "${@os.path.abspath(os.path.dirname(d.getVar('FILE', True)) + '/../..')}"

BBFILES ?= ""
BBLAYERS = " \
  ${BSPDIR}/sources/poky/meta \
  ${BSPDIR}/sources/poky/meta-yocto \
  \
  ${BSPDIR}/sources/meta-openembedded/meta-oe \
  ${BSPDIR}/sources/meta-openembedded/meta-multimedia \
  \
  ${BSPDIR}/sources/meta-fsl-arm \
  ${BSPDIR}/sources/meta-fsl-arm-extra \
  ${BSPDIR}/sources/meta-fsl-demos \
"
##Freescale Yocto Release layer
BBLAYERS += " ${BSPDIR}/sources/meta-fsl-bsp-release/imx/meta-bsp "
BBLAYERS += " ${BSPDIR}/sources/meta-fsl-bsp-release/imx/meta-sdk "
BBLAYERS += " ${BSPDIR}/sources/meta-browser "
BBLAYERS += " ${BSPDIR}/sources/meta-openembedded/meta-gnome "
BBLAYERS += " ${BSPDIR}/sources/meta-openembedded/meta-networking "
BBLAYERS += " ${BSPDIR}/sources/meta-openembedded/meta-python "
BBLAYERS += " ${BSPDIR}/sources/meta-openembedded/meta-ruby "
BBLAYERS += " ${BSPDIR}/sources/meta-openembedded/meta-filesystems "
BBLAYERS += " ${BSPDIR}/sources/meta-qt5 "
BBLAYERS += " ${BSPDIR}/sources/meta-elmo "

再次编译
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ bitbake elmo-example
Parsing recipes: 100% |#################################################################################################################################| Time: 00:01:06
Parsing of 2050 .bb files complete (0 cached, 2050 parsed). 2565 targets, 157 skipped, 3 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies

Build Configuration:
BB_VERSION        = "1.26.0"
BUILD_SYS         = "x86_64-linux"
NATIVELSBSTRING   = "Ubuntu-14.04"
TARGET_SYS        = "arm-poky-linux-gnueabi"
MACHINE           = "imx6ulevk"
DISTRO            = "poky"
DISTRO_VERSION    = "1.8"
TUNE_FEATURES     = "arm armv7a vfp neon callconvention-hard cortexa7"
TARGET_FPU        = "vfp-neon"
meta              
meta-yocto        = "(nobranch):83aa565d93aacae484976562ef1ae8dbbb6b2bc0"
meta-oe           
meta-multimedia   = "(nobranch):10d3c8f85280a0bf867a8e4f84bcda81c290d28e"
meta-fsl-arm      = "(nobranch):c5326c90d6754c8630504ae29244907b0841c3a9"
meta-fsl-arm-extra = "(nobranch):436b86e3421736216412bdbb21cd9cb08c758c75"
meta-fsl-demos    = "(nobranch):836bdf5a9d500ed258f1ddc07d89eca74a704098"
meta-bsp          
meta-sdk          = "(nobranch):2f59ef1080f616f391b1c488fb2204e570f90239"
meta-browser      = "(nobranch):4b27058a8275a5310161459c9bb8f4c52a77762c"
meta-gnome        
meta-networking   
meta-python       
meta-ruby         
meta-filesystems  = "(nobranch):10d3c8f85280a0bf867a8e4f84bcda81c290d28e"
meta-qt5          = "(nobranch):fc026381545650e10fdd488d5b2a3b2d78f87793"
meta-elmo         = ":"

NOTE: Preparing RunQueue
NOTE: Executing SetScene Tasks
NOTE: Executing RunQueue Tasks
NOTE: Tasks Summary: Attempted 371 tasks of which 358 didn't need to be rerun and all succeeded.

编译文件在tmp/work/cortexa7hf-vfp-neon-poky-linux-gnueabi/elmo-example/0.1-r0
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ ls tmp/work/cortexa7hf-vfp-neon-poky-linux-gnueabi/elmo-example/0.1-r0
configure.sstate   elmo-example.spec  image            packages-split  sstate-install-packagedata        sstate-install-populate_lic      temp
debugsources.list  helloworld         license-destdir  pkgdata         sstate-install-package_qa         sstate-install-populate_sysroot
deploy-rpms        helloworld.c       package          pseudo          sstate-install-package_write_rpm  sysroot-destdir
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ cat tmp/work/cortexa7hf-vfp-neon-poky-linux-gnueabi/elmo-example/0.1-r0/helloworld.c
#include
int main(int argc, char **argv)
{
    printf("Hello World!\n");
    return 0;
}


OK了，但此时文件系统里并没有我们的helloworld,先看看镜像中有没有Helloworld
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ sudo mount -o loop -t ext3 tmp/deploy/images/imx6ulevk/fsl-image-qt5-imx6ulevk.ext3 /home/work/rootfs/
[sudo] password for yangzhiwen:
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ ls /home/work/rootfs/usr/bin/helloworld
ls: cannot access /home/work/rootfs/usr/bin/helloworld: No such file or directory
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ sudo umount /home/work/rootfs
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$

因为我们的APP没有加进系统，现在我们加进去。
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ vi ../sources/meta-elmo/conf/layer.conf

# We have a conf and classes directory, add to BBPATH
BBPATH .= ":${LAYERDIR}"

# We have recipes-* directories, add to BBFILES
BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
        ${LAYERDIR}/recipes-*/*/*.bbappend"

IMAGE_INSTALL_append = "elmo-example"        #添加此语句

BBFILE_COLLECTIONS += "elmo"
BBFILE_PATTERN_elmo = "^${LAYERDIR}/"
BBFILE_PRIORITY_elmo = "6"
~  

                          
再编译,然后我们看看文件系统镜像：
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ bitbake fsl-image-qt5
/*省略编译过程,直接看结果*/
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ sudo mount -o loop -t ext3 tmp/deploy/images/imx6ulevk/fsl-image-qt5-imx6ulevk.ext3 /home/work/rootfs/
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$ ls /home/work/rootfs/usr/bin/helloworld
/home/work/rootfs/usr/bin/helloworld
yangzhiwen@yzw-kingsee:/home/work/workspace/fsl-release-bsp/build_qt5$


4.我们烧到板子上看看是否正确，minicom
Poky (Yocto Project Reference Distro) 1.8 imx6ulevk /dev/ttymxc0

imx6ulevk login: root
root@imx6ulevk:~# helloworld
Hello World!
root@imx6ulevk:~#

OK了。其他自己写的应用可以参照这个recipes的样板加入到文件系统。