OK6410移植Linux3.12.16

系统移植

1.由于Linux3.12.16上没有适用于OK6410的BSP文件，所以我们拷贝一份现有的BSP文件，然后在这上面做修改，使其支持OK6410，将arch/arm/mach-s3c64xx/下的,mach-smdk6410.c复制一份并重命名为mach-ok6410.c;

2.在arch/arm/mach-s3c64xx/这个目录的Kconfig中，模仿“config MACH_SMDK6410”添加配置项:

config MACH_OK6410
bool "OK6410"
select CPU_S3C6410
select HAVE_S3C2410_WATCHDOG if WATCHDOG
select S3C64XX_SETUP_FB_24BPP
select S3C64XX_SETUP_I2C1
select S3C64XX_SETUP_IDE
select S3C64XX_SETUP_KEYPAD
select S3C64XX_SETUP_SDHCI
select S3C64XX_SETUP_USB_PHY
select S3C_DEV_FB
select S3C_DEV_HSMMC
select S3C_DEV_HSMMC1
select S3C_DEV_I2C1
select S3C_DEV_RTC
select S3C_DEV_USB_HOST
select S3C_DEV_USB_HSOTG
select S3C_DEV_WDT
select SAMSUNG_DEV_ADC
select SAMSUNG_DEV_BACKLIGHT
select SAMSUNG_DEV_IDE
select SAMSUNG_DEV_KEYPAD
select SAMSUNG_DEV_PWM
select SAMSUNG_DEV_TS
help
Machine support for the Samsung OK6410

3.修改复制后的文件mach-ok6410.c，将该文件中的所有"smdk6410"改成"ok6410",不要改大写"SMDK6410"的.可用批量字符串替换命令：

perl -p -i -e "s/smdk6410/ok6410/g" ./mach-ok6410.c

意思是说将当前目录下mach-ok6410.c文件中的“smdk6410”都替换为“ok6410”。

修改 MACHINE_START(SMDK6410, "SMDK6410") 为 MACHINE_START(OK6410, "OK6410")//这个要和Kconfig里的MACH_OK6410匹配

4.在当前目录的Makefile最后一行加上:obj-$(CONFIG_MACH_OK6410) += mach-ok6410.o

5.打开arch/arm/tools/mach-types文件，在：

smdk6410 MACH_SMDK6410 SMDK6410 1626

后面添加：

ok6410 MACH_OK6410 OK6410 1626

6.修改源码根目录的Makefile

ARCH ?= $(SUBARCH)

CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)

改为

ARCH ?= arm

CROSS_COMPILE ?= /usr/local/arm/4.2.2-eabi/usr/bin/arm-linux-

7.复制arch/arm/configs/s3c6400-defconfig文件到根目录，重命名为.config

8.执行make menuconfig对内核进行配置：





9.执行 make zImage 生成zImage（在/arch/arm/boot下）
10.将该zImage下到开发板运行：



通过以上简单几步，内核已经移植成功了，接下来移植驱动。

LED驱动移植

Linu内核下drivers/leds/leds­gpio.c实现了一个体系结构无关的GPIO LED驱动，使用此LED 驱动，开发者不需要修改一行代码，只需要在 BSP 的板文件（对于OK6410 为arch/arm/mach­s3c6410/mach­-ok6410.c）中定义相关的platform设备和数据。在 OK6410开发板上,GPM0~GPM3 实现了四个 LED，因此其对应的platform
信息如下：
arch/arm/mach­s3c6410/mach­-ok6410.c:

static struct gpio_led ok6410_leds[] ={
[0]= {
.name = "LED1",
.gpio = S3C64XX_GPM(0),
},

[1]= {
.name = "LED2",
.gpio = S3C64XX_GPM(1),
},

[2]= {
.name = "LED3",
.gpio = S3C64XX_GPM(2),
},

[3]= {
.name = "LED4",
.gpio = S3C64XX_GPM(3),
},
};

static struct gpio_led_platform_data ok6410_gpio_led_pdata ={
.num_leds    = ARRAY_SIZE(ok6410_leds),
.leds         =ok6410_leds,
};

static struct platform_device ok6410_device_led ={
.name    = "leds-gpio",
.id        = -1,
.dev    ={
.platform_data = &ok6410_gpio_led_pdata,
},
};

将&ok6410_device_led添加到static struct platform_device *ok6410_devices[] __initdata中。

配置内核：
Device Drivers --->

[*] LED Support --->

<*> LED Support for GPIO connected LEDs

下载内核后开发板上的四个LED这时候已经全部都亮了

按键驱动移植

Linux内核下的drivers/input/keyboard/gpio_keys.c 实现了一个体系结构无关的 GPIO 按键驱动,使用此按键驱动,开发者不需要修改一行代码，只需要在BSP 的板文件（对于 OK6410为arch/arm/mach­s3c6410/mach­-ok6410.c）中定义相关的platform 设备和数据。在 OK6410开发板上,用 GPN0~GPN5实现了DOWN、ENTER、HOME、UP、TAB、END
六个按键，因此其对应的 platform 信息如下：
arch/arm/mach­s3c6410/mach­-ok6410.c:

#include <linux/gpio_keys.h>

static struct gpio_keys_button ok6410_buttons[] = {
{
.gpio        = S3C64XX_GPN(0),
.code        = KEY_UP,
.desc        = "Up",
.active_low    = 1,
.wakeup        = 0,
},

{
.gpio        = S3C64XX_GPN(1),
.code        = KEY_DOWN,
.desc        = "Down",
.active_low    = 1,
.wakeup        = 0,
},

{
.gpio        = S3C64XX_GPN(2),
.code        = KEY_LEFT,
.desc        = "Left",
.active_low    = 1,
.wakeup        = 0,
},

{
.gpio        = S3C64XX_GPN(3),
.code        = KEY_RIGHT,
.desc        = "Right",
.active_low    = 1,
.wakeup        = 0,
},

{
.gpio        = S3C64XX_GPN(4),
.code        = KEY_ENTER,
.desc        = "Enter",
.active_low    = 1,
.wakeup        = 0,
},

{
.gpio        = S3C64XX_GPN(5),
.code        = KEY_ESC,
.desc        = "Esc",
.active_low    = 1,
.wakeup        = 0,
}
};

static struct gpio_keys_platform_data ok6410_button_data ={
.buttons    =ok6410_buttons,
.nbuttons    =ARRAY_SIZE(ok6410_buttons),
};

static struct platform_device ok6410_device_button    = {
.name        ="gpio-keys",
.id            = -1,
.dev        = {
.platform_data =&ok6410_button_data,
},
};

将&ok6410_device_button添加到static struct platform_device *ok6410_devices[] __initdata中

配置linux内核
Device Drivers --->

Input device support --->

[*] Keyboards --->

<*> GPIO Buttons

LCD驱动移植

1.根据芯片手册，修改mach-ok6410.c里面相应的平台信息：

/*
pixclock = 1000000 / DCLK = 1000000 / 9 = 111111
left_margin = Thb = 2
right_margin = Thf = 2
hsync_len = Thp = 41
upper_margin = Tvb = 2
lower_margin = Tvf = 2
vsync_len = Tvp = 10
xres = Thd = 480
Yres = Tvd = 272
*/
static struct s3c_fb_pd_win ok6410_fb_win0 = {
.max_bpp	= 32,
.default_bpp	= 16,
.xres		= 480,
.yres		= 272,
.virtual_y	= 272 * 2,
.virtual_x	= 480,
};

static struct fb_videomode ok6410_lcd_timing = {
.left_margin	= 2,
.right_margin	= 2,
.upper_margin	= 2,
.lower_margin	= 2,
.hsync_len	= 41,
.vsync_len	= 10,
.xres		= 480,
.yres		= 272,
};

static struct map_desc ok6410_iodesc[] = {
{
/* LCD support */
.virtual = (unsigned long)S3C_VA_LCD,
.pfn = __phys_to_pfn(S3C_PA_FB),
.length = SZ_16K,
.type = MT_DEVICE,
},
};

2.然后将飞凌提供的Linux内核中的drviers/video/samsung目录拷贝到drviers/video/目录下

3.修改drviers/video/的Kconfig文件，在文件中加入：

source "drivers/video/samsung/Kconfig"

4.修改修改drviers/video/的Makefie文件,再最后一行添加：

obj-$(CONFIG_FB_S3C_EXT) += samsung/

5.在arch/arm/plat-samsung/include/plat/map-base.h里面添加：

#define S3C_VA_LCD S3C_ADDR(0x01100000) /* LCD */

6.把drivers/video/samsung/s3cfb_fimd4x.c里面的

第1417行：

s3c6410_pm_do_save(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

改成

s3c_pm_do_save(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

第1438行

s3c6410_pm_do_restore(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

改成

s3c_pm_do_restore(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

7.把飞凌提供的Linux内核中arch/arm/plat-samsung/include/plat/ 目录下的 regs-fb.h , regs-fb-v4.h 拷贝到linux-3.12.16的相同目录下

8.把飞凌提供的Linux内核中arch/arm/mach-s3c64xx/include/mach/ 目录下的 regs-fb.h , regs-lcd.h 拷贝到linux-3.12.16的相同目录下

9.配置内核：

Device Drivers --->

Graphics support --->

<*> S3C Framebuffer Support (eXtended)（修改Kconfig之后才有这个选）

Select LCD Type (4.3 inch 480x272 TFT LCD) --->

(X) 4.3 inch 480x272 TFT LCD

<*> Advanced options for S3C Framebuffer

Select BPP(Bits Per Pixel) (16 BPP) --->

(4) Number of Framebuffers

[ ] Enable Virtual Screen

[*] Enable Double Buffering

<*> Support for frame buffer devices ---> （里面的都空选）

[ ] Backlight & LCD device support --->

Console display driver support --->

<*> Framebuffer Console support

[*] Bootup logo --->（显示小企鹅）

[*] Standard 224-color Linux logo

如果驱动移植成功，内核启动会应该会显示小企鹅。