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。
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,
},
};
##################################################################################################
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/
#################################################################################################
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。
#################################################################################################
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
#################################################################################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