基于s3c2410开发板的2.6.26.5内核移植

这是本人的一个课程总结，其中涉及几个驱动文件在最小内核编译时是不需要的。

kernel：2.6.26.5

gcc：arm-linux-gcc（gcc 3.4.1）

cpu：s3c2410

编译设置

使用arm-linux-交叉编译工具链

修改根目录下Makefile

ARCH ?= arm

CROSS_COMPILE ?=arm-linux-

内核移植

nand分区

修改arch/arm/plat-s3c24xx/common-smdk.c，找到相关代码做如下修改

static struct mtd_partition smdk_default_nand_part[] = {

/* [0] = {

.name = "Boot Agent",

.size = SZ_16K,

.offset = 0,

},

[1] = {

.name = "S3C2410 flash partition 1",

.offset = 0,

.size = SZ_2M,

},

[2] = {

.name = "S3C2410 flash partition 2",

.offset = SZ_4M,

.size = SZ_4M,

},

[3] = {

.name = "S3C2410 flash partition 3",

.offset = SZ_8M,

.size = SZ_2M,

},

[4] = {

.name = "S3C2410 flash partition 4",

.offset = SZ_1M * 10,

.size = SZ_4M,

},

[5] = {

.name = "S3C2410 flash partition 5",

.offset = SZ_1M * 14,

.size = SZ_1M * 10,

},

[6] = {

.name = "S3C2410 flash partition 6",

.offset = SZ_1M * 24,

.size = SZ_1M * 24,

},

[7] = {

.name = "S3C2410 flash partition 7",

.offset = SZ_1M * 48,

.size = SZ_16M,

}*/

/* start: for harbour */

[0] = {

name: "bootloader",

size: 0x00100000,

offset: 0x0,

},

[1] = {

name: "kernel",

size: 0x00300000,

offset: 0x00100000,

},

[2] = {

name: "root",

size: 0x02800000,

offset: 0x00400000,

},

[3] = {

name: "user",

size: 0x00f00000,

offset: 0x02d00000,

}

};

/* end: for harbour */

static struct s3c2410_nand_set smdk_nand_sets[] = {

[0] = {

.name = "NAND",

.nr_chips = 1,

.nr_partitions = ARRAY_SIZE(smdk_default_nand_part),

.partitions = smdk_default_nand_part,

},

};

static struct s3c2410_platform_nand smdk_nand_info = {

.tacls = 0,

.twrph0 = 30,

.twrph1 = 0,

.nr_sets = ARRAY_SIZE(smdk_nand_sets),

.sets = smdk_nand_sets,

};

此时如果运行

#make s3c2410_defconfig启用s3c2410默认内核配置

#make menuconfig

修改

boot option

default command line

root=/dev/mtdblock2 init=linuxrc console=ttySAC0,115200

运行

#make bzImage

此时的内核就可在板上跑通了。

触摸屏驱动移植

修改arch/arm/mach-s3c2410/mach-smdk2410.c，添加

static struct s3c2410ts_mach_info s3c2410_tscfg __initdata = {

.delay = 10000,

.presc = 49,

.oversampling_shift = 2,

};

修改static struct platform_device *smdk2410_devices[] __initdata = {

&s3c_device_usb,

&s3c_device_lcd,

&s3c_device_wdt,

&s3c_device_i2c,

&s3c_device_iis,

/*start: for harbour*/

&s3c_device_ts, //加入此行

/*end: for harbour*/

};

在static void __init smdk2410_init(void)中加入：

s3c24xx_ts_set_platdata(&s3c2410_tscfg);

在include/asm-arm/plat-s3c24xx/devs.h中加入

extern struct platform_device s3c_device_ts;

在driver/input/touchscreen/下添加s3c2410-ts.c文件，

在include/asm-arm/arch-s3c2410/下添加ts.h文件，ts.h文件内容如下：

#ifndef __ASM_ARM_S3C2410_TS_H

#define __ASM_ARM_S3C2410_TS_H

struct s3c2410ts_mach_info {

int delay;

int presc;

int oversampling_shift;

};

extern void __init s3c24xx_ts_set_platdata(struct s3c2410ts_mach_info *);

#endif /* __ASM_ARM_S3C2410_TS_H */

修改arch/arm/plat-s3c24xx/devs.c，加入

#include

/* Touch Screen Controller */

struct platform_device s3c_device_ts = {

.name = "s3c2410-ts",

.id = -1,

};

EXPORT_SYMBOL(s3c_device_ts);

void __init s3c24xx_ts_set_platdata(struct s3c2410ts_mach_info *pd)

{

struct s3c2410ts_mach_info *npd;

npd = kmalloc(sizeof(*npd), GFP_KERNEL);

if (npd) {

memcpy(npd, pd, sizeof(*npd));

s3c_device_ts.dev.platform_data = npd;

} else {

printk(KERN_ERR "no memory for TS platform datan");

}

}

将s3c2410-ts.c文件拷入drivers/input/touchscreen/目录下。

修改drivers/input/touchscreen/Makefile

加入obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410-ts.o

修改drivers/input/touchscreen/Kconfig，在if INPUT_TOUCHSCREEN下加入

config TOUCHSCREEN_S3C2410

tristate “s3c2410 touchscreen”

depends on ARCH_SMDK2410

default y

help

This is used for supporting s3c2410 touchscreen.

LCD驱动移植

修改arch/arm/mach-s3c2410/mach-smdk2410.c，添加

static struct s3c2410fb_display s3c2410fb_lcd_display __initdata = {

.width = 320,

.height = 240,

.xres = 320,

.yres = 240,

.bpp = 16,

.lcdcon5 = S3C2410_LCDCON5_FRM565 |

S3C2410_LCDCON5_INVVCLK |

S3C2410_LCDCON5_INVVLINE |

S3C2410_LCDCON5_INVVFRAME |

S3C2410_LCDCON5_HWSWP |

(0<<7) |

(0<<6) |

(0<<1),

.type =S3C2410_LCDCON1_TFT,

.pixclock = 270000,

.left_margin = 7,

.right_margin = 8,

.hsync_len = 29,

.upper_margin = 11,

.lower_margin = 14,

.vsync_len = 2,

};

static struct s3c2410fb_mach_info s3c2410fb_lcdcfg __initdata = {

.displays = &s3c2410fb_lcd_display,

.num_displays = 1,

.default_display = 0,

.lpcsel = 0x0,

.gpccon = 0xaa9556a9,

.gpccon_mask = 0xfffffff,

.gpcup = 0xffffffff,

.gpcup_mask = 0xffffffff,

.gpdcon = 0xaaaaaaaa,

.gpdcon_mask = 0xfffffff,

.gpdup = 0xffffffff,

.gpdup_mask = 0xffffffff,

};

在static void __init smdk2410_init(void)中加入：

s3c24xx_fb_set_platdata(&s3c2410fb_lcdcfg);

用提供的s3c2410fb.c.nbsp;替换drivers/video/s3c2410fb.c.

声卡驱动移植

将s3c2410sound.c加到目录/sound/oss下；

修改sound/oss下的Kconfig文件：

在文件中添加：

Config S3C2410_SOUND_OSS

Tristate “S3C2410 1341 sound driver ”

修改/linux-2.6.14/sound/oss下的Makefile文件：

在文件中添加一行：

Obj-$(CONFIG_S3C2410_SOUND_OSS) += s3c2410sound.o

网卡（DM9000）驱动移植

修改arch/arm/mach-s3c2410/mach-smdk2410.c,找到如下代码修改：

#define pSMDK2410_ETH_IO (__phys_to_pfn(0x18000000))

static struct map_desc smdk2410_iodesc[] __initdata = {

/* start: for harbour */

{vSMDK2410_ETH_IO, pSMDK2410_ETH_IO, SZ_1M, MT_DEVICE},

/* end: for harbour */

};

在如下结构体中添加：

static struct platform_device *smdk2410_devices[] __initdata = {

&s3c_device_dm9000,

};

修改arch/arm/plat-s3c24xx/devs.c中添加：

#include

#define DM9000A_BASE 0x18000300

#define DM9000A_OFFSET1 0x03

#define DM9000A_OFFSET2 0x04

static struct resource s3c_dm9000_resource[] = {

[0] = {

.start = DM9000A_BASE, // 0x19000000 + 0x300,

.end = DM9000A_BASE+DM9000A_OFFSET1,//0x19000000 + 0x300 + 0x03,

.flags = IORESOURCE_MEM

},

[1] = {

.start = DM9000A_BASE+DM9000A_OFFSET2,//0x19000000 + 0x300 + 0x04,

.end = DM9000A_BASE+DM9000A_OFFSET2+DM9000A_OFFSET1, //old is 7f 0x3f

.flags = IORESOURCE_MEM

},

[2] = {

.start = IRQ_EINT19,

.end = IRQ_EINT19,

.flags = IORESOURCE_IRQ,//|IORESOURCE_IRQ_LOWEDGE,

}

};

static struct dm9000_plat_data s3c_device_dm9000_platdata = {

.flags = DM9000_PLATF_16BITONLY,

};

struct platform_device s3c_device_dm9000 = {

.name= "dm9000",

.id= -1,

.num_resources= ARRAY_SIZE(s3c_dm9000_resource),

.resource= s3c_dm9000_resource,

.dev= {

.platform_data = &s3c_device_dm9000_platdata,

}

};

EXPORT_SYMBOL(s3c_device_dm9000);

修改drivers/net/dm9000.c:用提供的dm9000.c替换原有的文件。

文件系统建立

利用原来的rootfs文件目录，在dev目录下建立设备文件，

#mknod console c 5 1

#mknod null c 1 3

#mknod zero c 1 5

#mkdir input

#mknod mice c 13 63

#mknod mouse0 c 13 32

#mknod event0 c 13 64

#mkdir mtdblock

#mknod 0 b 31 0

#mknod 1 b 31 1

#mknod 2 b 31 2

#mknod 3 b 31 3

#mkdir vc

#mknod 0 c 4 0

#mknod 1 c 4 1

#mknod 2 c 4 2

#mkdir tts

#mknod 0 c 204 64

#mknod 1 c 204 65

#mknod 2 c 204 66

#mkdir shm

#mkdir usb

其他的文件可根据需要如此添加，由于cramfs为只读文件系统，2.6.26.5内核去掉了devfs，所以要在文件系统中建立好需要的文件节点，或者是将dev目录挂载成可读写文件系统，使用udev来添加设备节点。

修改usr/etc/rc.local

注释掉rm –r /dev/ts

ln –sf /dev/input/mouse0 /dev/ts

目的是为了消除一条错误提示信息。

内核配置

修改内核源码根目录下的Makefile，

ARCH ?= arm

CROSS_COMPILE ?= arm-linux-

直接使用内核中专门为s3c2410提供的配置文件，在arch/arm/configs下

#make s3c2410_defconfig

#make menuconfig进行其他配置

添加tmpfs支持

File systems ->

Pseudo filesystems >

[*] Virtual memory file system support (former shm fs)

这样就可以将tmpfs进行挂载，来开辟出可写的目录。

选中触摸屏接口

Device Drivers->

Input device support ->

[*]Event interface

2.6.26.5内核用event接口取代了原来的tsdev接口，因此此处应选中event interface。