Cross-compiled Raspberry Pi 2 kernel in CentOS

Cross-compiled Raspberry Pi 2 kernel in CentOS

Cross-compilation toolchain in CentOS 6.6 x64 requires glibc-2.14 support (x86 is not needed), so first install the glibc-2.14

Install the relevant compilation tools before installation. Here I will install the entire group directly.

Yum groupinstall "Development tools"-y

Download the glibc-2.14 source code, compile, install

Wget http://ftp.gnu.org/gnu/glibc/glibc-2.14.tar.xz
Mkdir/ usr/local/glibc-2.14
Tar xvf glibc-2.14.tar.xz
Cd glibc-2.14
Mkdir build
Cd build
../Configure -- prefix =/usr/local/glibc-2.14/
Make & make install

Set temporary environment variables

Export LD_LIBRARY_PATH =/usr/local/The glibc-2.14/lib: $ LD_LIBRARY_PATH

Obtain the cross-compilation toolchain, kernel, and firmware (this method is used in this article)

Wget-O https://github.com/raspberrypi/tools/archive/master.tar.gz
Wget-O https://github.com/raspberrypi/linux/archive/rpi-4.1.y.tar.gz
Wget-O https://github.com/raspberrypi/firmware/archive/master.tar.gz

You can also use git to clone related repositories:

Git init
Git clone -- depth 1 git: // github.com/raspberrypi/linux.git
Git clone -- depth 1 git: // github.com/raspberrypi/tools.git
Git clone git: // github.com/raspberrypi/firmware.git

Install the tool chain and add it to the environment variable:

Tar xvf tools-master.tar.gz-C/opt
Vim/etc/profile
Export PATH = $ PATH:/opt/tools-master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin
./Etc/profile
Music linux-rpi-4.1.y linux
Cd linux

Ensure that the compilation directory is clean (if extracted from the tar.gz file, it can be omitted)

Make mrproper

Generate the default Kernel configuration file

Make ARCH = arm CROSS_COMPILE = arm-linux-gnueabihf-bcm2709_defconfig

To change the configuration, run the following command:

# CentOS 6.6x64 run yum install ncurses-devel
Make ARCH = arm CROSS_COMPILE = arm-linux-gnueabihf-menuconfig

Set Environment Variables

KERNEL = kernel7

Start Compilation

Make ARCH = arm CROSS_COMPILE = arm-linux-gnueabihf-zImage modules dtbs

After compilation, remove the Raspberry Pi SD card and put it on CentOS.

Mkdir/mnt/fat32
Mkdir/mnt/ext4
Mount/dev/sdb1/mnt/fat32
Mount/dev/sdb2/mnt/ext4

Installation Module

Make ARCH = arm CROSS_COMPILE = arm-linux-gnueabihf-INSTALL_MOD_PATH =/mnt/ext4 modules_install

Copy the kernel and drive to the SD card

# Back up the original kernel first
Cp/mnt/fat32/$ KERNEL. img/mnt/fat32/$ KERNEL-backup.img
Scripts/mkknlimg arch/arm/boot/zImage mnt/fat32/$ KERNEL. img
Cp arch/arm/boot/dts/*. dtb/mnt/fat32/
Cp arch/arm/boot/dts/overlays/*. dtb */mnt/fat32/overlays/
Cp arch/arm/boot/dts/overlays/README/mnt/fat32/overlays/

Update firmware

Tar xvf firmware-master.tar.gz
Cd firmware-master
# Replacing Related Files
Cp boot/*. dat/mnt/fat32/
Cp boot/*. elf/mnt/fat32/
Cp boot/bcm2709-rpi-2-b.dtb/mnt/fat32/

Update vc Library

Cp-rv hardfp/opt/vc/mnt/ext4/opt/vc

After that, uninstall the SD card.

Umount/dev/sdb1
Umount/dev/sdb2

Plug the SD card into raspberry pi 2 and power in. OK!

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