linux-2.6.29.1在utu2440上的移植(含lcd驱动移植)

一、开发平台

主  机：VMware--Fedora 8

开发板：utu2440--64MB Nand

编译器：arm-linux-gcc-4.3.2

软件资源：linux-2.6.29.1.tar.bz2

              yaffs2 内核补丁cvs-root.tar.gz

 

二、移植步骤

解压内核源码

# tar jxf linux-2.6.29.1.tar.bz2 –C /home/work_dir

# cd linux-2.6.29.1

 

1. 修改根目录Makefile

ARCH            ?= arm

CROSS_COMPILE   ?= arm-linux-

 

2. 修改平台输入时钟

修改arch/arm/mach-s3c2440/mach-smdk2440.c

找到smdk2440_map_io函数中s3c24xx_init_clocks(16934400);

改为s3c24xx_init_clocks(12000000);

 

3. 修改s3c2440的机器码

由于Bootloader传递给Linux内核的机器号为5244，为与Bootloader传递参数一致，修改 arch/arm/tools/math-types文件。

s3c2440               ARCH_S3C2440              S3C2440                    362

修改为：

s3c2440               ARCH_S3C2440              S3C2440                    5244

 

4. 修改Nand flash分区信息

修改arch/arm/plat-s3c24xx/common-smdk.c

修改mtd分区信息

static struct mtd_partition smdk_default_nand_part[] = {

        [0] = {

                .name   = "bootloader",

                .size   = 0x00040000,

                .offset = 0x00000000,

        },

        [1] = {

                .name   = "kernel",

                .offset = 0x00060000,

                .size   = 0x00200000,

        },

        [2] = {

                .name   = "root",

                .offset = 0x00260000,

                .size   = 0x03dac000,

        }

};

然后修改struct s3c2410_platform_nand smdk_nand_info = {

.tacls          = 0,

.twrph0         = 30,

.twrph1         = 0,

…

};

 

5. LCD参数修改

这里用的是NEC3.5英寸屏液晶屏，大小为240x320，需要修改文件arch/arm/mach-s3c2440/mach-smdk2440.c

static struct s3c2410fb_display smdk2440_lcd_cfg __initdata = {

…

.width          = 240,

.height         = 320,

…

.right_margin   = 37,

.hsync_len      = 6,

.upper_margin   = 2,

.lower_margin   = 6,

.vsync_len      = 2,

};

 

static struct s3c2410fb_mach_info smdk2440_fb_info __initdata = {

…

.gpccon         = 0xaa955699,

.gpccon_mask    = 0xffc003cc,

.gpcup          = 0x0000ffff,

.gpcup_mask     = 0xffffffff,

.gpdcon         = 0xaa95aaa1,

.gpdcon_mask    = 0xffc0fff0,

.gpdup          = 0x0000faff,

.gpdup_mask     = 0xffffffff,

.lpcsel          = 0xf82,

};

 

6. 给内核打yaffs2文件系统的补丁

进入，点击“Download GNU tarball”，下载后出现cvs-root.tar.gz压缩包

# tar –zxf cvs-root.tar.gz –C /home/work_dir

# cd /home/work_dir/cvs/yaffs2

# ./patch-ker.sh c /home/work_dir/linux-2.6.29.1

上面命令完成下面三件事情：

(1) 修改内核fs/Kconfig

    增加一行:source "fs/yaffs2/Kconfig"

(2) 修改内核fs/Makefile

    增加一行:ojb-$(CONFIG_YAFFS_FS) +=yaffs2/

(3) 在内核fs/目录下创建yaffs2目录

    将yaffs2源码目录下面的Makefile.kernel文件复制为内核fs/yaffs2/Makefie;

    将yaffs2 源码目录的Kconfig文件复制到内核fs/yaffs2目录下;

将yaffs2源码目录下的*.c *.h文件复制到内核fs/yaffs2目录下

 

7. 配置内核

通过以下命令将2410的默认配置文件写到当前目录下的.config。S3C2410的配置和S3C2440差不多，在这基础上进行修改

# make  s3c2410_defconfig

# make menuconfig

System Type  --->

       S3C2410 Machines  --->

              [*] SMDK2410/A9M2410

       S3C2440 Machines  --->

              [*] SMDK2440

              [*] SMDK2440 with S3C2440 CPU module

 

Kernel Features  --->

       [*] Use the ARM EABI to compile the kernel

注：由于所使用的的交叉编译arm-linux-gcc-4.3.2是符合EABI标准交叉编译器，对于浮点运行会预设硬浮点运算FPA(Float Point Architecture)，而没有FPA的CPU，比如SAMSUNG S3C2410/S3C2440，会使用FPE(Float Point Emulation 即软浮点)，这样在速度上就会遇到极大的限制，使用EABI(Embedded Application Binary InteRFace)则可以对此改善处理，ARM EABI有许多革新之处，其中最突出的改进就是Float Point Performance，它使用Vector Float Point(矢量浮点)，因此可以极大提高涉及到浮点运算的程序.

 

Userspace binary formats  --->

       [*] Kernel support for ELF binaries

 

File systems  --->

       [*] Miscellaneous filesystems  --->

              <*>   YAFFS2 file system support

              [*]         Lets Yaffs do its own ECC

              <*>   Journalling Flash File System v2 (JFFS2) support

              [*]     JFFS2 write-buffering support

              [*]     JFFS2 summary support (EXPERIMENTAL)

              <*>   Compressed ROM file system support (cramfs)

              <*>   ROM file system support

[*] Network File Systems  --->

       <*>   NFS client support

       [*]     Root file system on NFS

-*- Native language support  --->

       <*>   Codepage 437 (United States, Canada)

       <*>   Simplified Chinese charset (CP936, GB2312)

       <*>   Traditional Chinese charset (Big5)

       <*>   ASCII (United States)

       <*>   NLS ISO 8859-1  (Latin 1; Western European Languages)

       <*>   NLS UTF-8

 

Device Drivers  --->

<*> Memory Technology Device (MTD) support  --->

              [*]   MTD partitioning support

              <*>   Direct char device access to MTD devices

              <*>   Caching block device access to MTD devices

<*>   NAND Device Support  --->

              <*>   NAND Flash support for S3C2410/S3C2440 SoC

 

       Graphics support  --->

              <*> Support for frame buffer devices  --->

                     [*]   Enable firmware EDID

                     [*]   Enable Video Mode Handling Helpers

                     <*>   S3C2410 LCD framebuffer support

              Console display driver support  --->

                     <*> Framebuffer Console support

                     [*] Select compiled-in fonts

                     [*]   VGA 8x8 font

                     [*]   VGA 8x16 font

 

8. 编译内核

编写一个shell脚本make_uImage.sh用于编译内核

#!/bin/sh

 

make clean

make all

cp arch/arm/boot/zImage zImage -f

mkimage -A arm -O linux -n $(date --iso-8601=seconds) -C NONE -a 0x30008000 -e 0x30008000 -d zImage uImage

 

# chmod +x make_uImage.sh

# ./make_uImage.sh

 

 

参考资料：

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