FL2440移植linux-3.0全过程（5）添加u盘挂载，LCD支持等
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 //配置u盘的热插拔
[*] Block devices --->
<*> Low Performance USB Block driver
SCSI device support --->
<*> SCSI device support
<*> SCSI generic support
[*] Probe all LUNs on each SCSI device
[*] USB support --->
<*> Support for Host-side USB
[*] USB device filesystem (DEPRECATED)
[*] USB device class-devices (DEPRECATED)
<*> USB Monitor
<*> OHCI HCD support
<*> USB Mass Storage support
File systems ---> //配置u盘的文件系统
DOS/FAT/NT Filesystems --->
<*> MSDOS fs support
<*> VFAT (Windows-95) fs support
(936) Default codepage for FAT
(cp936) Default iocharset for FAT
-*- Native language support ---> //配置u盘的语言格式支持，不过感觉着个配置没什么用，中文也支持不了，也许是因为linux对中文的支持并不好吧
<*> 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，（现在板子上面有u盘）就可以看到以下信息了
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
usbcore: registered new interface driver ub
Uniform Multi-Platform E-IDE driver
usbcore: registered new interface driver uas
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
mousedev: PS/2 mouse device common for all mice
i2c /dev entries driver
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
Freeing init memory: 13188K
usb 1-1: new full speed USB device number 2 using s3c2410-ohci
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
usb 1-1.2: new full speed USB device number 3 using s3c2410-ohci
uba: uba1
usb 1-1.2: USB disconnect, device number 3
usb 1-1.1: new full speed USB device number 4 using s3c2410-ohci
uba: uba1
这时候就可以看到我们的u盘已经挂载好了。
后记：
有时候，我们可能发现我们配置好了内核，但是我们的u盘无论如何也发现不了，这时候就出现了一个问题，这个问题不是在于我的内核配置有错误，而是在于我们的u-boot设置usb的时钟不对引起的。这样，我就不得不重新回到u-boot，配置好usb的时钟。
修改u-boot中：board/fl2440/fl2440.c文件中关于usb的时钟的内容，将如下三个宏的值改为如下
#define U_M_MDIV 0x38
#define U_M_PDIV 0x2
#define U_M_SDIV 0x2
重新编译u-boot和内核，烧写，重启之后，我们的内核就能支持u盘了。
关于u-boot中设置时钟的问题，这里有一篇比较好的文章，里面详细的叙述了fl2440的时钟问题，链接如下
http://hi.baidu.com/kkernel/item/9b5d64c1378fbf42a9ba9497 希望给你们带来帮助。
添加LCD支持
make menuconfig 如下
Device Drivers --->
Graphics support --->
<*> Support for frame buffer devices --->
[*] Backlight & LCD device support --->
<*> S3C2410 LCD framebuffer support
[*] Bootup logo --->
[*] Standard black and white Linux logo
[*] Standard 16-color Linux logo
[*] Standard 224-color Linux logo
修改arch/arm/mach-s3c2440/mach-smdk2440.c中的结构体smdk2440_devices[] __initdata，添加为如下：
static struct platform_device *smdk2440_devices[] __initdata = {
&s3c_device_ohci,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&s3c_device_dm9000,
&s3c_device_adc, /* modify by hurryliu */
&s3c_device_ts, /* add end*/
};
修改smdk2440_lcd_cfg__initdata 结构体为下面的内容
static struct s3c2410fb_display smdk2440_lcd_cfg __initdata = {
.lcdcon5 = S3C2410_LCDCON5_FRM565 |
S3C2410_LCDCON5_INVVLINE |
S3C2410_LCDCON5_INVVFRAME |
S3C2410_LCDCON5_PWREN |
S3C2410_LCDCON5_HWSWP,
.type = S3C2410_LCDCON1_TFT,
.width = 320,
.height = 240,
.pixclock = 111111, /* HCLK 60 MHz, divisor 10 */
.xres = 480,
.yres = 272,
.bpp = 16,
.left_margin = 38,
.right_margin = 20,
.hsync_len = 30,
.upper_margin = 15,
.lower_margin = 12,
.vsync_len = 3,
};
smdk2440_fb_info__initdata 结构体也要改，修改为如下
static struct s3c2410fb_mach_info smdk2440_fb_info __initdata = {
.displays = &smdk2440_lcd_cfg,
.num_displays = 1,
.default_display = 0,
.lpcsel = ((0xCE6) & ~7) | 1<<1,
};
修改完了之后，编译，烧写到nandflash中，启动开发板，这个时候，可以把u-boot的中的bootargs修改一下，添加如下
console=tty1 console=ttyS0,115200
这时候，我们的开发板启动就能够看到久违的小企鹅了，而且由于我们的console是指定的tty1 和ttyS0，这时候我们启动的信息也将会打印到我们的LCD屏上。
