20160719_jeffrey - silenceuncrio/diary GitHub Wiki

Index

0930 - bitbake.conf 在 <POKY_DIR>/poky/meta/conf 目錄
1050 - core-image-minimal 是個 recipe
1115 - From Bitbake Hello World to an Image
1310 - The Linux Command Line: A Complete Introduction
1725 - review M300 web
1815 - 異種國度 - Alienation
1825 - The Linux Command Line: A Complete Introduction

0930

review 先

試著用昨天學到的 BitBake 知識來 trace M300

bitbake.conf 在 <POKY_DIR>/poky/meta/conf 目錄下

##################################################################
# General work and output directories for the build system.
##################################################################

TMPDIR ?= "${TOPDIR}/tmp"
CACHE = "${TMPDIR}/cache${@['', '/' + str(d.getVar('MACHINE', True))][bool(d.getVar('MACHINE', True))]}${@['', '/' + str(d.getVar('SDKMACHINE', True))][bool(d.getVar('SDKMACHINE', True))]}"
# The persistent cache should be shared by all builds
PERSISTENT_DIR = "${TOPDIR}/cache"
LOG_DIR = "${TMPDIR}/log"
CO_DIR = "${DL_DIR}"
CVSDIR = "${CO_DIR}/cvs"
SVNDIR = "${CO_DIR}/svn"
GITDIR = "${CO_DIR}/git2"
BZRDIR = "${CO_DIR}/bzr"
HGDIR = "${CO_DIR}/hg"

STAMPS_DIR ?= "${TMPDIR}/stamps"
STAMP = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"
STAMPCLEAN = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/*-*"
BASE_WORKDIR ?= "${TMPDIR}/work"
WORKDIR = "${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"
T = "${WORKDIR}/temp"
D = "${WORKDIR}/image"
S = "${WORKDIR}/${BP}"
B = "${S}"

bblayers.conf 在 /home/jeffrey/M300/fsl-release-bsp/build_small/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-fsl-arm \
  ${BSPDIR}/sources/meta-fsl-arm-extra \
"
##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-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-proscend "

這裡可以看到 BBLAYERS 的定義

BitBake 會依照這些 layer list 去找個別的 layer.conf

<POKY_DIR>/poky/meta/conf/layer.conf
<POKY_DIR>/poky/meta-yocto/conf/layer.conf
<POKY_DIR>/meta-openembedded/meta-oe/conf/layer.conf
<POKY_DIR>/meta-fsl-arm/conf/layer.conf
<POKY_DIR>/meta-fsl-arm-extra/conf/layer.conf
<POKY_DIR>/meta-fsl-bsp-release/imx/meta-bsp/conf/layer.conf
<POKY_DIR>/meta-fsl-bsp-release/imx/meta-sdk/conf/layer.conf
<POKY_DIR>/meta-openembedded/meta-networking/conf/layer.conf
<POKY_DIR>/meta-openembedded/meta-python/conf/layer.conf
<POKY_DIR>/meta-openembedded/meta-ruby/conf/layer.conf
<POKY_DIR>/meta-openembedded/meta-filesystems/conf/layer.conf
<POKY_DIR>/meta-proscend/conf/layer.conf

以 <POKY_DIR>/poky/meta/conf/layer.conf 為例

# We have a conf and classes directory, add to BBPATH
BBPATH .= ":${LAYERDIR}"
# We have recipes-* directories, add to BBFILES
BBFILES += "${LAYERDIR}/recipes-*/*/*.bb"

BitBake 從 BBFILES 可以找到屬於該 layer 的 recipe

jeffrey@jeffrey-VirtualBox:~/M300/fsl-release-bsp/sources/poky/meta$ ls recipes-*/*/*.bb
recipes-bsp/acpid/acpid_2.0.23.bb
recipes-bsp/alsa-state/alsa-state.bb
...

一大堆...

1050

以 bitbake core-image-minimal 為例

core-image-minimal 就是個 recipe

recipe file 在 <POKY_DIR>/poky/meta/recipes-core/images/core-image-minimal.bb

由 bitbake core-image-minimal -c devshell 得知 source code 在

<BUILD_DIR>/tmp/work/imx6ulevk-poky-linux-gnueabi/core-image-minimal/1.0-r0/core-image-minimal-1.0

1115

先利用 inherit 關鍵字把相關的 *.bbclass 追出來

<POKY_DIR>/poky/meta/recipes-core/images/core-image-minimal.bb

...
inherit core-image
...

<POKY_DIR>/poky/meta/classes/core-image.bbclass

...
inherit image
...

<POKY_DIR>/poky/meta/classes/image.bbclass

參考 From Bitbake Hello World to an Image

實在很不容易 trace...

不過我知道了最後一階段做的事叫做 do_rootfs()

log 在 <BUILD_DIR>/tmp/work/imx6ulevk-poky-linux-gnueabi/core-image-minimal/1.0-r0/temp/log.do_rootfs.pid

之前一直想知道所謂的 *.sdcard image 到底是怎麼 build 出來的

秘密就在 log 裡面

...
NOTE: Running image creation script for sdcard: /home/jeffrey/M300/fsl-release-bsp/build_small/tmp/work/imx6ulevk-poky-linux-gnueabi/core-image-minimal/1.0-r0/temp/create_image.sdcard ...
...

不過要花時間去挖 <BUILD_DIR>/tmp/work/imx6ulevk-poky-linux-gnueabi/core-image-minimal/1.0-r0/temp/create_image.sdcard

#!/bin/sh

# Emit a useful diagnostic if something fails:
bb_exit_handler() {
  ...
}
...
img_creation_func() {
  ...
}

bberror() {
	echo "ERROR: $*"
}

generate_imx_sdcard() {
  ...
}

img_creation_func

看來要把 YOCTO 弄熟

shell script 的功力不能省

1310

意外的發現自己有這一本 amazon 上賣得相當好的 The Linux Command Line: A Complete Introduction

當初從 http://www.it-eboot.info 下載... 目前已經關站了

1725

下午 ariel 找我跟 jammy 開了個會 review 一下 M300 希望的 web 長相

其實也是 review 一下 M300 要做多少功能

1815

今天下班要買異種國度 - Alienation

這就是由 dead nation 班底打造的最新作品

我想這就是我一直在期待可以和老婆一起玩的遊戲

類似 Diablo 視角 - hell driver 也是採用類似設計
單機雙人
中文 - 目前 dead nation 是英文就玩得很爽了

1825

The Linux Command Line: A Complete Introduction 這本書從下午看到現在

還沒看到 shell script

不過這本書的節奏真的很不錯