linux-3.15.4 Kernel porting

1. Unzip the kernel

sudo xz-d linux-3.15.4.tar.xz

sudo tar xvf linux-3.15.4.tar

2. Modify the makefile on the top level of the kernel source

sudo vim Makefile

Arch=arm

cross_compile=arm-linux-

3.vim arch/arm/mach-s3c24xx/mach-smdk2440.c

S3c24xx_init_clocks (12000000);
The 4.make menuconfig command configures the kernel, uses the default profile/arch/arm/configs/s3c2410_defconfig, selects the CPU, adds its own information to the configuration sheet, supports Eabi (it optimizes for floating-point arithmetic, Use it to compile applications more efficiently)

Note: Make Menuconfig in Ubuntu will be error-messages as follows:

Unable to find the ncurses libraries or the
Required header files.
' Make Menuconfig ' requires the ncurses libraries.
***
Install ncurses (Ncurses-devel) and try again.
***
MAKE[1]: * * [Scripts/kconfig/dochecklxdialog] Error 1
Make: * * [Menuconfig] Error 2

Workaround:

On the command line, enter:

sudo apt-get install Libncurses5-dev

Then in make Menuconfig, success.

Ncurses is a dynamic library that provides function key definitions (shortcuts), screen drawing, and graphical interactive functions based on text terminals.

5. Modify the machine code, in the Arch/arm/tools/mach-types, the s3c2440 corresponding machine code to uboot passed in the same.