s3c2440 lcd驱动移植

———————————————————————————————————————主机操作系统：Centos 6.7交叉编译器环境：arm-linux-gcc-4.5.4 开发板平台： FL2440 Linux内核版本： linux-3.0 开发模块： lcd驱动移植

lcd屏幕尺寸:4.3寸邮箱：[email protected]———————————————————————————————————————

一.lcd简介：

       LCD（Liquid Crystal Display的简称）​​液晶​​显示器。

       LCD 的构造是在两片平行的​​玻璃​​基板当中放置液晶盒，下基板玻璃上设置​​TFT​​（薄膜晶体管），上基板玻璃上设置彩色滤光片，通过TFT上的信号与电压改变来控制液晶分子的转动方向，从而达到控制每个像素点偏振光出射与否而达到显示目的。现在LCD已经替代CRT成为主流，价格也已经下降了很多，并已充分的普及。

二.修改内核代码

[leiyuxing@centos6 linux-3.0]$ vim arch/arm/mach-s3c2440/mach-smdk2440.c

162 static struct s3c2410fb_display smdk2440_lcd_cfg __initdata = {
163
164         .lcdcon5        = S3C2410_LCDCON5_FRM565 |
165                           S3C2410_LCDCON5_INVVLINE |
166                           S3C2410_LCDCON5_INVVFRAME |
167                           S3C2410_LCDCON5_PWREN |
168                           S3C2410_LCDCON5_HWSWP,
169
170         .type           = S3C2410_LCDCON1_TFT,
171
172         .width          = 480,//modify by leiyuxing
173         .height         = 272,//modify by leiyuxing
174
175         .pixclock       = 4000, /* HCLK 60 MHz, divisor 10 */  //modify by leiyuxing
176         .xres           = 480,//modify by leiyuxing
177         .yres           = 272,//modify by leiyuxing
178         .bpp            = 16,//modify by leiyuxing
179         .left_margin    = 19,//modify by leiyuxing
180         .right_margin   = 10,//modify by leiyuxing
181         .hsync_len      = 30,//modify by leiyuxing
182         .upper_margin   = 4,//modify by leiyuxing
183         .lower_margin   = 2,//modify by leiyuxing
184         .vsync_len      = 8,//modify by leiyuxing
185 };
......
204         .lpcsel     = 0,//((0xCE6) & ~7) | 1<<4,//modify by leiyuxing

三.配置内核文件

[leiyuxing@centos6 linux-3.0]$make menuconfig

Device Drivers  ---> Graphics (图像)support  --->

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

                           [*]   Enable firmware EDID

                           [*]   Enable Video Mode Handling Helpers

                           <*>   S3C2410 LCD framebuffer support

             [*] Backlight & LCD device support  --->

                          <M>   Lowlevel LCD controls

                          <M>   Lowlevel Backlight controls

                          <M>     Generic (aka Sharp Corgi) Backlight Driver

                                        Console display driver support  --->

                                                     <*> Framebuffer Console support
                                                     [*]   Map the console to the primary display device

                                                     [*]   Framebuffer Console Rotation

                                                     [*] Select compiled-in fonts

                                                     [*]   VGA 8x8 font

                                                     [*]   Mini 4x6 font

                                    [*] Bootup logo  ---> 

                                                    [*]   Standard 224-color Linux logo

这样就配置完了，然后

[leiyuxing@centos6 linux-3.0]$ make

如果要想在开发板的屏幕上看到你启动的代码，则因修改如下环境变量

set bootargs 'console=ttyS0 console=tty1,115200 mem=64M ubi.mtd=2 root=ubi0:rootfs rootwait rootfstype=ubifs rw'

set bootargs_ubifs 'console=ttyS0 console=tty1,115200 mem=64M ubi.mtd=2 root=ubi0:rootfs rootwait rootfstype=ubifs rw'

启动Linux内核，可以看到small penguin.