Linux3.0.8平台搭建移植文档——lcd驱动移植 1）修改背光灯platform_device资源
修改platform_device中的platform_data（即淀粉牙签platform_pwm_backlight_data）的参数如下：
#vi arch/arm/mach-s5pv210/mach-smdkv210.c
static struct platform_pwm_backlight_data smdkv210_backlight_data = {
.pwm_id = 3,
.max_brightness = 255,
.dft_brightness = 255,
.pwm_period_ns = 2500000,
.init = smdkv210_backlight_init,
.exit = smdkv210_backlight_exit,
};
#make menuconfig
System Type -->
[*] PWM device support
Device Drivers -->
Graphics support --->
...
[*] Backlight & LCD device support --->
--- Backlight & LCD device support
< > Lowlevel LCD controls
<*> Lowlevel Backlight controls
< > Generic (aka Sharp Corgi) Backlight Driver
<*> Generic PWM based Backlight Driver
3）make
将在arch/arm/boot/下生成编译好的可执行程序zImage下载到开发板即可 4）测试背光灯驱动是否正常运行
我们可以调节一下背光的亮度，背光灯驱动在sys目录下为我们提供了操作接口，到如下文件：
cd /sys/devices/platform/s3c24xx-pwm.3/pwm-backlight.0/backlight/pwm-backlight.
0/
显示当前亮度：#cat brightness
设置背光亮度：#echo 50 > brightness //背光灯亮度范围为0~255
2.lcd驱动移植—frambuffer
1）修改frambuffer的platform_device资源
修改扫描参数（即smdkv210_fb_win0变量），具体修改如下：
#vi arch/arm/mach-s5pv210/mach-smdkv210.c
static struct s3c_fb_pd_win smdkv210_fb_win0 = {
.win_mode = {
.left_margin = 13,
.right_margin = 120, //右边界长度修改为120
.upper_margin = 7,
.lower_margin = 5,
.hsync_len = 3,
.vsync_len = 1,
胸针设计 .xres = 800,
.yres = 480,
},
.max_bpp = 32,
.default_bpp = 32, //位深设置为32
中空板封边机};
2）配置framebuffer选项
#make menuconfig
Device Drivers -->
Graphics support --->
...
<*> Support for frame buffer devices --->
*** Frame buffer hardware drivers ***
< > Epson S1D13XXX framebuffer support
<*> Samsung S3C framebuffer support
[ ] Debug register writes
...
console display driver support --->
<*> Framebuffer Console support
[*] Map the console to the primary display device
[ ] Framebuffer Console Rotation (NEW)
[ ] Select compiled-in fonts (NEW)
3)make
将在arch/arm/boot/下生成编译好的可执行程序zImage下载到开发板即可，现象为不再花屏，也可以向屏幕输出一个字符串进行验证：echo “hello” > /dev/tty0
3.lcd驱动移植—开机logo功能实现
1）开机logo的驱动代码准备
#vi极早期烟雾探测器 drivers/video/s3c-fb.c
在s3c_fb_probe铃木秀一函数的结尾部添加以下代码：
static int __devinit s3c_fb_probe(struct platform_device *pdev)
{
....
....
platform_set_drvdata(pdev, sfb);
pm_runtime_put_sync(sfb->dev);
/* show the logo*/
#if defined(CONFIG_LOGO)
if (fb_prepare_logo( sfb->windows[pd->default_win]->fbinfo, FB_ROTATE_UR)) {
printk("[valor lion]: Start display and show logo\n");
/* Start display and show logo on boot */
fb_set_cmap(&sfb->windows[pd->default_win]->fbinfo->cmap, sfb->windows[pd->default_win]->fbinfo);
fb_show_logo(sfb->windows[pd->default_win]->fbinfo, FB_ROTATE_UR);
}
#endif
/*end*/
return 0;
....
}
在上面添加的代码中使用了“default_win”,所以要为到smdkv210_lcd0_pdata 结构体添加一个成员：
#vi arch/arm/mach-s5pv210/mach-smdkv210.c
static struct s3c_fb_platdata smdkv210_lcd0_pdata __initdata = {
.win[0] = &smdkv210_fb_win0,
.default_win = 0,
.vidcon0 = VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
.vidcon1 = VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC,
.setup_gpio = s5pv210_fb_gpio_setup_24bpp,
};
2）配置logo驱动支持
#make menuconfig
Device Drivers -->
Graphics support --->
[*] Bootup logo --->
[ ] Standard black and white Linux logo
[ ] Standard 16-color Linux logo 裂隙水
[*] Standard 224-color Linux logo
3)make
将在arch/arm/boot/下生成编译好的可执行程序zImage下载到开发板即可，现象为左上角会现示一只小企鹅
注意：
运行qt程序提示以下错误：
[root@sunplusedu /home]#Cannot create semaphore /tmp/qtembedded-0/QtEmbedded-0
'd'
Error 38 Function not implemented
Cannot get display lock
answer：
这个问题发生的主要原因是因为linux kernel不支持信号量的相关操作，也就是说在kernel的编译配置中没有信号量相关的选项给选上，所以导致不能正常创建！编译时配置内核如下选项：
General setup --->
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