Arm9+linux fl2440 lcd驱动移植、添加MMC支持、添加U盘支持

来源：互联网发布：snmp linux版本查询编辑：程序博客网时间：2024/06/06 12:43

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主机操作系统：centos 6.7
交叉编译器版本：arm-linux-gcc-4.5.4
开发板平台：fl2440
linux内核版本：Linux-3.0

lcd屏幕：4.3寸

Author: shaocongshuai <916962705@qq.com>

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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。

Linux lcd详细信息:

http://www.linuxidc.com/Linux/2011-03/33519.htm

[shaocongshuai@localhost linux-3.0.2]$ vim arch/arm/mach-s3c2440/mach-smdk2440.c

...

115     .type       = S3C2410_LCDCON1_TFT,
116
117     .width      = 480,
118     .height     = 272,
119
120     .pixclock   = 40000, /* HCLK 60 MHz, divisor 10 */
121     .xres       = 480,
122     .yres       = 272,
123     .bpp        = 16,
124     .left_margin    = 19,
125     .right_margin   = 10,
126     .hsync_len = 30,
127     .upper_margin   = 4,
128     .lower_margin   = 2,
129     .vsync_len = 8,

...

149 .lpcsel = 0,//((0xCE6) & ~7) | 1<<4,

...

配置内核文件

[shaocongshuai@localhost linux-3.0.2]$ 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

Console display driver support --->
<*> Framebuffer Console support

[*] Bootup logo --->

[*] Standard 224-color Linux logo

这样就配置完了，然后

[shaocongshuai@localhost linux-3.0.2]$ make

启动Linux内核，可以看到small penguin.

二、添加MMC的支持

mmc支持很简单，linux内核中提供了，所以直接选上这些选项，重新编译就行了。

Device Drivers --->

<*> MMC/SD/SDIO card support --->

<*> MMC block device driver

<*> Samsung S3C SD/MMC Card Interface support

三、添加U盘支持

FL2440添加u盘的挂载比较简单，大部分的内容都是在内核里面做make menuconfig，配置内核。

Device Drivers --->

Generic Driver Options --->

(/sbin/hotplug) path to uevent helper （支持热拔插）

[*] Block devices --->

<*> Low Performance USB Block driver

SCSI device support --->

<*> SCSI device support

<*> SCSI generic support

[*] Probe all LUNs on each SCSI device

[*] legacy /proc/scsi/ support
<*> SCSI disk support

配置U盘的文件系统

File systems --->

DOS/FAT/NT Filesystems --->

<*> MSDOS fs support

<*> VFAT (Windows-95) fs support

(437) Default codepage for FAT

(iso8859-1) Default iocharset for FAT

-*- Native language support --->

<*> Simplified Chinese charset (CP936, GB2312)

<*> ASCII (United States)

<*> NLS UTF-8

配置好之后，重新编译，烧写到板子上面运行

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