檢視 Kernel 的原始碼

== source ==
* <nowiki>git clone git://github.com/raspberrypi/linux.git</nowiki>
* <nowiki>svn co file:///var/svn/rpi_linux/trunk</nowiki>

== toolchain ==
* <nowiki>git clone https://github.com/raspberrypi/tools</nowiki>

== Prepare SD ==
* Transfer the following files from the firmware/boot directory to the Raspberry pi /boot directory:
    bootcode.bin
    fixup.dat
    start.elf

* cp firmware/hardfp/opt/ /media/root/opt/ -rf

== build ==
* make mrproper
* cp arch/arm/configs/bcmrpi_defconfig .config
* export CCPREFIX=/path/to/your/compiler/binary/prefix-of-binary-
* make ARCH=arm CROSS_COMPILE=${CCPREFIX} oldconfig
* make ARCH=arm CROSS_COMPILE=${CCPREFIX}

== libraries ==
* pi@raspberrypi:~$ ls /lib/ <br>
arm-linux-gnueabihf                   libip4tc.so.0         libnih.so.1.0.0<br>
cpp                                   libip4tc.so.0.1.0     libxtables.so.7<br>
firmware                              libip6tc.so.0         libxtables.so.7.0.0<br>
init                                  libip6tc.so.0.1.0     lsb<br>
klibc-sO6SifHCdmbehHGtm0y1yHu6vb0.so  libipq.so.0           modprobe.d<br>
ld-linux-armhf.so.3                   libipq.so.0.0.0       modules<br>
ld-linux.so.3                         libiptc.so.0          systemd<br>
libaudit.so.0                         libiptc.so.0.0.0      terminfo<br>
libaudit.so.0.0.0                     libnih-dbus.so.1      udev<br>
libauparse.so.0                       libnih-dbus.so.1.0.0  xtables<br>
libauparse.so.0.0.0                   libnih.so.1<br>

== Update kernel in Raspbian ==
=== Get source ===
# $ git clone --depth=1 https://github.com/raspberrypi/linux
# $ sudo apt-get install bc
=== Raspberry Pi 1 (or Compute Module) Default Build Configuration ===
# $ cd linux
# $ KERNEL=kernel
# $ make bcmrpi_defconfig
=== Raspberry Pi 2 Default Build Configuration ===
# $ cd linux
# $ KERNEL=kernel7
# $ make bcm2709_defconfig
=== Build and install the kernel, modules and Device Tree blobs ===
# $ make zImage modules dtbs
# $ sudo make modules_install
# $ sudo cp arch/arm/boot/dts/*.dtb /boot/
# $ sudo cp arch/arm/boot/dts/overlays/*.dtb* /boot/overlays/
# $ sudo cp arch/arm/boot/dts/overlays/README /boot/overlays/
# $ sudo scripts/mkknlimg arch/arm/boot/zImage /boot/$KERNEL.img

Note: On a Raspberry Pi 2, adding -j4 (make -j4 zImage modules dtbs) splits the work between all four cores, speeding up compilation significantly.

=== Cross Compile ===
#$ git clone https://github.com/raspberrypi/tools
#add /tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin to your $PATH
# make bcm2709_defconfig ARCH=arm
# make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs -j4

==reference ==
* [http://elinux.org/RPi_Kernel_Compilation RPi Kernel Compilation]
* [https://www.raspberrypi.org/documentation/linux/kernel/building.md Kernel Building]