Linux2.6.39 for utu2440

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Kernel Preparation

First download the kernel source from kernel.org:

$ wget https://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.39.tar.bz2
$ tar xjvf lnux-2.6.39.tar.bz2

Change the Makefile:

$ cat Makefile
export KBUILD_BUILDHOST := $(SUBARCH)
ARCH		?= $(SUBARCH)
CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)

# Added our own cross-compiler here.
ARCH		?= arm
CROSS_COMPILE	?= arm-linux-
# End of added own cross-compiler. 

Change the pltf input clock:

$ vim  arch/arm/mach-s3c2440/mach-smdk2440.c
static void __init smdk2440_map_io(void)
{
	s3c24xx_init_io(smdk2440_iodesc, ARRAY_SIZE(smdk2440_iodesc));
	//s3c24xx_init_clocks(16934400);
	// Change the input clock adjust to utu2440
	s3c24xx_init_clocks(12000000);
	s3c24xx_init_uarts(smdk2440_uartcfgs, ARRAY_SIZE(smdk2440_uartcfgs));
}

Change the machine code(this code is the same as the bootloader’s parameter, bootloader transfer 5244 to Linux Kernel.

$ vim arch/arm/tools/mach-types 
s3c2440			ARCH_S3C2440		S3C2440			5244

Change the Nand flash partitions:

$ vim  arch/arm/plat-s3c24xx/common-smdk.c
static struct mtd_partition smdk_default_nand_part[] = {
	// partition for utu2440
	[0]= {
		.name = "bootloader", 
		.size = 0x00040000,
		.offset = 0x00000000,
	},
	[1]= {
		.name = "kernel", 
		.size = 0x00060000,
		.offset = 0x00200000,
	},
	[2]= {
		.name = "root", 
		.size = 0x00260000,
		.offset = 0x03dac000,
	}
	

};

static struct s3c2410_platform_nand smdk_nand_info = {
	.tacls		= 0,
	.twrph0		= 30,
	.twrph1		= 0,

Begin to configure:

# export PATH=/opt/cross/arm-linux-gcc_4.3.2/bin:$PATH
# vim Makefile
//ARCH                 ?= $(SUBARCH)
//CROSS_COMPILE     ?=
ARCH                 ?= arm
CROSS_COMPILE     ?= arm-linux-
# make s3c2410_defconfig
# make menuconfig
System Type-> ARM system type(Samsung S3C2410, S3C2412, ......
S3C2410 Machines  --->    [*] SMDK2410/A9M2410
S3C2440 AND S3C2442 Machines ---> [*] SMDK2440     [*] SMDK2440 with S3C2440 CPU module 
Kernel Features  --->   [*] Use the ARM EABI to compile the kernel

Then make all V=1
Generate uImage:

# cp arch/arm/boot/zImage ./
[root@TrustyArch linux-2.6.39]# mkimage -A arm -O linux -n $(date --iso-8601=seconds) -C NONE -a 0x30008000 -e 0x30008000 -d zImage uImage
Image Name:   2014-10-18T20:27:54+0800
Created:      Sat Oct 18 20:27:54 2014
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    2094940 Bytes = 2045.84 kB = 2.00 MB
Load Address: 30008000
Entry Point:  30008000

Now copy the uImage to the tftp directory for testing