手把手教你移植linux内核---------OK6410（三）

妖狐艹你老母 2022-06-02 10:08 185阅读 0赞

### OK6410--LCD液晶驱动移植： ###

下面来移植一个4.3寸LCD液晶。

首先打开我们的板级BSP文件，修改里面的fb部分代码，即液晶配置部分代码

root@ubuntu:/forlinx/linux-3.3.5/arch/arm/mach-s3c64xx# gedit mach-ok6410.c

找到static struct s3c\_fb\_pd\_win ok6410\_fb\_win0这个结构体

修改成

static struct s3c_fb_pd_win ok6410_fb_win0 = {
        /* this is to ensure we use win0 */
        .win_mode    = {
            .left_margin    = 2,
            .right_margin    = 2,
            .upper_margin    = 2,
            .lower_margin    = 2,
            .hsync_len    = 41,
            .vsync_len    = 10,
            .xres        = 480,
            .yres        = 272,
        },
        .max_bpp    = 32,
        .default_bpp    = 16,
    };

不同的液晶对应的配置会不同，具体查看对应液晶的手册。  
继续寻找，找到

static struct map_desc ok6410_iodesc[] = {};

上面这个结构体是空的，我们修改为

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

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将飞凌3.0.1内核（或其它内核）中的drviers/video/下的samsung目录拷贝我们对应的目录中来。

修改drviers/video/的Kconfig文件，在文件的最后添加

source "drivers/video/samsung/Kconfig"

修改drviers/video/的Makefie文件,把我们添加进来的文件进行内核编译时同时编译，再最后一行添加：

obj-$(CONFIG_FB_S3C_EXT) += samsung/

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

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

在include/generated/atuoconfig.h文件最后添加

#define CONFIG_FB_S3C_EXT_NUM 4

在drivers/video/samsung/s3cfb\_fimd4x.c文件中的

3.0中的对应1438行

s3c6410_pm_do_save(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

修改成

s3c_pm_do_save(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

把1459行，

s3c6410_pm_do_restore(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

修改成

s3c_pm_do_restore(s3c_lcd_save, ARRAY_SIZE(s3c_lcd_save));

保存。

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飞凌linux源码中的arch\\arm\\mach-s3c64xx\\include\\mach下的regs-fb.h和regs-lcd.h拷贝到我们对应的目录。  
配置内核

Device Drivers --->

Graphics support --->

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

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

\[ \] Backlight & LCD device 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

Console display driver support --->

<\*> Framebuffer Console support

\[\*\] Bootup logo --->（显示小企鹅）

\[\*\] Standard 224-color Linux logo

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又可以开始编译了把内核下载到开发板后，启动的时候会出现一只企鹅就是linux。

启动部分出现

S3C\_LCD clock got enabled :: 133.000 Mhz  
LCD TYPE :: LTE480WV will be initialized  
Window\[0\] - FB1: map\_video\_memory: clear ffd80000:0007f800  
            FB1: map\_video\_memory: dma=5f900000 cpu=ffd80000 size=0007f800  
Window\[0\] - FB2: map\_video\_memory: clear ffdbfc00:0003fc00  
            FB2: map\_video\_memory: dma=5f93fc00 cpu=ffdbfc00 size=0003fc00  
Console: switching to colour frame buffer device 60x34  
fb0: s3cfb frame buffer device  
Window\[1\] - FB1: map\_video\_memory: clear ffd00000:0007f800  
            FB1: map\_video\_memory: dma=5f980000 cpu=ffd00000 size=0007f800  
Window\[1\] - FB2: map\_video\_memory: clear ffd3fc00:0003fc00  
            FB2: map\_video\_memory: dma=5f9bfc00 cpu=ffd3fc00 size=0003fc00  
fb1: s3cfb frame buffer device  
Window\[2\] - FB1: map\_video\_memory: clear ffcc0000:0003fc00  
            FB1: map\_video\_memory: dma=5fa00000 cpu=ffcc0000 size=0003fc00  
fb2: s3cfb frame buffer device  
Window\[3\] - FB1: map\_video\_memory: clear ffc80000:0003fc00  
            FB1: map\_video\_memory: dma=5fa40000 cpu=ffc80000 size=0003fc00  
fb3: s3cfb frame buffer device

证明你的LCD驱动已经成功移植了