Freescale-sdk linux port a build compiling environment script host-prepare.sh Analysis

Freescale-sdk linux port a build compiling environment script host-prepare.sh Analysis

Next we will use our out-of-class break time to port and analyze linux based on the PowerPC architecture freescale-sdk. Refer to the official documentation freescale linux sdk START_HERE.html, first of all to build the compiling environment script host-prepare.sh analysis. Before porting the system, you need to build a compilation environment, install necessary packages, and prepare for the later compilation system. Many people have a headache when they see the script. The following is my analysis process. If the analysis is poor, leave a message and discuss it together.

1. Build compiling environment script analysis./scripts/host-prepare.sh

Freescale @ freescale-sdk :~ /SDK/QorIQ-SDK-V1.4-20130625-yocto $./scripts/host-prepare.sh-h
Usage:./scripts/host-prepare.sh [-h] [-f]
-H: display help
-F: force install all needed host pkgs, running non-interactively
Analyze the./scripts/host-prepare.sh script and enter the command./scripts/host-prepare.sh-h to display help information.
SCRIPT_DIR = 'readlink-f $ (dirname $0) '# obtain the directory where the current script is located.
Usage_message () {# Help subfunction, input-h or -? Call this function to run
Echo "Usage: $0 [-h] [-f]
-H: display help
-F: force install all needed host pkgs, running non-interactively
"
} # Getopts options variable
While getopts "fh" host_prepare_flag # Each time a loop is executed, getopts checks the next command line parameter and determines whether it is legal. Check whether the parameter starts with-, followed by a letter contained in option
Do # If yes, the matching option letter will exist in the specified variable, and return the exit status 0;
Case $ host_prepare_flag in # If the letter after-is not included in options, ?, And return the exit status 0;
F) force_update = 'true'; # If no parameter exists in the command line, or the next parameter does not start with "-", an exit status other than "0" is returned.
;;
?) Usage_message; exit 1;
;;
Esac
Done
# Check host distribution # check the system type of the customer service machine. The/etc/lsb-release file exists. open the file to display DISTRIB_ID = Ubuntu DISTRIB_RELEASE = 10.04.
If [-r/etc/lsb-release] & grep Ubuntu/etc/lsb-release>/dev/null 2> & 1 #1 indicates stdout standard output, the default value is 1.>/dev/null is equivalent to 1>/dev/null.
Then #2 indicates stderr standard error
# Ubuntu-based system
./Etc/lsb-release
Distro = "Ubuntu"
Release =$ {DISTRIB_RELEASE}
Hostpkg = "apt-get"
Elif [-r/etc/debian_version]
Then
# Debian-based
Distro = "Debian"
Release = 'cat/etc/debian_version'
Hostpkg = "apt-get"
......
Echo "Verifying sudo permission to execute $ hostpkg command." # output Verifying sudo permission to execute apt-get command.
User = 'whoam' | true # The following statements are about root permission judgment, which will be analyzed later ???
......
Case "$ distro" in # according to the above system judgment to get $ distro = "Ubuntu", so execute script = "$ SCRIPT_DIR/host-prepare-ubuntu-mint-debian.sh ";
'Ubuntu '| 'mint' | 'debian ')
Script = "$ SCRIPT_DIR/host-prepare-ubuntu-mint-debian.sh ";
;;
'Redhat' | 'cento' | 'ora ora ')
Script = "$ SCRIPT_DIR/host-prepare-rhel-centos-fedora.sh ";
;;
'Suse' | 'opensuse ')
Script = "$ SCRIPT_DIR/host-prepare-suse.sh ";
;;
Esac
# Followed by the above analysis $ SCRIPT_DIR/host-prepare-ubuntu-mint-debian.sh, where $ SCRIPT_DIR = ~ /Sdks/QorIQ-SDK-V1.4-20130625-yocto/scripts
If test $ force_update; then UPDATE_FLAG = '-y -- force-Yes'; fi # force_update = 'true' value: UPDATE_FLAG ='-y -- force-Yes'
PKGS = "sed wget subversion git-core coreutils \
Unzip texi2html texinfo libsdl1.2-dev docbook-utils fop gawk \
Python-pysqlite2 diffstat make gcc build-essential unzip tproc \
G ++ desktop-file-utils chrpath libgl1-mesa-dev libglu1-mesa-dev \
Autoconf automake groff libtool xterm libxml-parser-perl \
"
# Pkgs required for fsl use
PKGS = "$ PKGS vim-common xz-utils cvs tofrodos libstring-crc32-perl"
PKGS = "$ PKGS patch libbonobo2-common libncurses5-dev"
If ["'uname-m'" = "x86_64"]; then
PKGS = "$ PKGS ia32-libs lib32ncurses5-dev"
Fi # package to be installed when assigning values to PKGS
Echo "Now we're re going to install all the other development packages needed to build Yocto, please wait"
Sudo apt-get $ UPDATE_FLAG install $ PKGS # Build the compiling environment and install necessary packages
Now, necessary packages have been installed to build the environment for normal system compilation.