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build-galileo-kernel-80211p.md

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##ENVIRONMENT

  • Tested in 64bit UBUNTU 12.04
  • The following steps assume the environment is 64bit UBUNTU 12.04.

sudo apt-get install build-essential git diffstat gawk chrpath texinfo libtool gcc-multilib libncurses5-dev ##CROSS-COMPILE TOOLCHAIN

  1. If 64bit system:
    1. Download clanton-full-eglibc-x86_64-i586-toolchain-1.4.2.sh
    2. Extract: ./clanton-full-eglibc-x86_64-i586-toolchain-1.4.2.sh
  2. If 32bit system:
    1. Download clanton-full-eglibc-i686-i586-toolchain-1.4.2.sh
    2. Extract: ./clanton-full-eglibc-i686-i586-toolchain-1.4.2.sh
  3. Remember the path to the toolchain for later usage.

##CROSS-COMPILE KERNEL

  1. Download kernel:

    git clone https://github.com/CTU-IIG/802.11p-linux.git  
cd 802.11p-linux  
git checkout its-g5_v3
git checkout bf45e0160af428dac8893e48d506ac428fed16b2

  2. Patch the kernel:

    git am ../patchset/*.patch

  3. Configure the kernel

    mv ../configfile .config
make menuconfig

    You can manually configure the kernel in the menuconfig, or do noting. Remember to exist menuconfig with saving the config file.

  4. Include the toolchain in your PATH:

    export PATH=<path_to_toolchain>/sysroots/x86_64-pokysdk-linux/usr/bin/i586-poky-linux:$PATH
source <path_to_toolchain>/environment-setup-i586-poky-linux

  5. Cross-compile the kernel

    make -j4 ARCH=i386 LOCALVERSION= CROSS_COMPILE=i586-poky-linux-

  6. Extract the kernel modules from the build to a target directory (e.g ../galileo-modules)

    make modules_install ARCH=i386 LOCALVERSION= INSTALL_MOD_PATH=../galileo-modules CROSS_COMPILE=i586-poky-linux-

  7. Two stuff for later usage:

    • kernel image: arch/x86/boot/bzImage
    • kernel modules: ../galileo-modules/*

##PREPARE THE FILESYSTEM AND SDCARD

  1. Download the prebuild image.
  2. After downloading: 
    unzip galileo_xbolshe_iot_1.2.0_kernel_v3.19.8_featured_201601091.zip
cd galileo_xbolshe_iot_1.2.0_kernel_v3.19.8_featured_201601091
mkdir tmp
sudo mount image-full-quark.ext3 tmp
  3. Put the kernel modules we have built into image-full-quark.ext3. 
    sudo cp -rf <path_to_galileo-modules>/galileo-modules/* tmp/
sudo umount tmp
  4. Put the kernel modules into the initrd. 
    gunzip core-image-minimal-initramfs-quark.cpio.gz	
cd tmp
cpio -i -F ../core-image-minimal-initramfs-quark.cpio
sudo cp -rf <path_to_galileo-modules>/galileo-modules/* .
find . | cpio -o -H newc | gzip -9 > ../core-image-minimal-initramfs-quark.cpio.gz
cd ..
  5. Replace the bzImage with one we have built before. cp <path_to_802.11p-linux>/arch/x86/boot/bzImage .
  6. Format the SDCARD with fat32 and put everything into it. cp * <path_to_sdcard>

##Build the iw

  1. Set the toolchain. source <path_to_toolchain>/environment-setup-i586-poky-linux

  2. iw requires the Netlink Protocol Library Suite (libnl). Download, cross compile and install the Netlink Protocol libraries:

    wget http://www.infradead.org/~tgr/libnl/files/libnl-3.2.24.tar.gz
tar -xzf libnl-3.2.24.tar.gz
cd libnl-3.2.24
./configure --host=i386 --prefix=<path_to_toolchain>/sysroots/x86_64-pokysdk-linux/usr
make 
make install
cd include
make install
mv <path_to_toolchain>/sysroots/x86_64-pokysdk-linux/usr/include/libnl3/netlink <path_to_toolchain>/sysroots/x86_64-pokysdk-linux/usr/include/

  3. Download and build iw.

    git clone https://github.com/CTU-IIG/802.11p-iw.git
cd 802.11p-iw
make
mv iw iw-ocb

##Configure OCB interface

chmod 777 iw-ocb
#./iw-802.11p reg set DE
ip link set wlp1s0 down
./iw-802.11p dev wlp1s0 set type ocb
ip link set wlp1s0 up
./iw-802.11p dev wlp1s0 ocb join 5910 10MHZ

# Get the interface statistics
ip -s link show dev wlan0

http://www.linuxidc.com/Linux/2007-05/4417.htm http://blog.csdn.net/youyoulg/article/details/6889101 https://gist.github.com/lisovy/80dde5a792e774a706a9

https://github.com/xbolshe/galileo-custom-images/tree/master/iot_1.2.0_kernel_3.19.8 https://github.com/xbolshe/galileo-sources/tree/master/iot_1.2.0_kernel_3.19.8