一，修改代码
（1）在linux-2.6.14/arch/arm/mach-s3c2410/mach-smdk2410.c 中加入如下内容
/******************add for usb ***********************/
#include <asm/arch/usb-control.h> #include <asm/arch/regs-clock.h> #include <linux/device.h> #include <linux/delay.h>
struct s3c2410_hcd_info usb_s3c2410_info = { .port[0] = { .flags = S3C_HCDFLG_USED } }int smdk2410_usb_init(void) { /* USB */ unsigned long upllvalue = (0x78<<12)|(0x02<<4)|(0x03); printk(“USB Control, (c) 2006 s3c2410/n”); s3c_device_usb.dev.platform_data = &usb_s3c2410_info; while(upllvalue!=__raw_readl(S3C2410_UPLLCON)) { __raw_writel(upllvalue,S3C2410_UPLLCON); mdelay(1); } return 0;}
/******************************add by YXJ**********************************/
（2）在static void __init smdk2410_map_io(void)函数中添加如下内容
smdk2410_usb_init(); //add for usb by YXJ（3）在 drivers/usb/host/ohci-s3c2410.c中
添加头文件
#include <asm/arch/usb-control.h>
在static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)函数中添加
/*********************add for usb by YXJ***************************/ unsigned long upllvalue = (0x78<<12)|(0x02<<4)|(0x03);
while (upllvalue != __raw_readl(S3C2410_UPLLCON)) { __raw_writel(upllvalue, S3C2410_UPLLCON); mdelay(1); } /***********************add for usb by YX end *********************/ 据说添加这一部分是由S3c2410中UPLLCON自身的问题引起的，具体可参考下面论述
http://www.linuxforum.net/forum/showflat.php?Cat=&Board=embedded&Number=556915&page=0&view=collapsed&sb=7&o=all&fpart=all
否则插上usb设备时会出现如下提示：
usb 1-1: new full speed USB device using s3c2410-ohci and address 2usb 1-1: device descriptor read/64, error -110usb 1-1: device descriptor read/64, error -110
二，编译内核
USB驱动设置，可能有些不选也行，不过没时间去试，至于为什么要选这些选项的话可以看一下这个贴（Linux下的硬件驱动——USB设备）：
http://www-128.ibm.com/developerworks/cn/linux/l-usb/index1.html
│ │ Device Drivers —>
│ │ Generic Driver Options —>
│<*> Hotplug firmware loading support
│ │ Block devices —>
│ │ <*> Low Performance USB Block driver
│ │ SCSI device support —>
│ │ <*> SCSI generic support
│ │
? Probe all LUNs on each SCSI device
│ │ USB support —>
│ │<*> Support for Host-side USB
│ │
? USB device filesystem
│ │<*> OHCI HCD support
│ │<*> USB Mass Storage support
│ │
? USB Monitor
３、加入了MSDOS fs和VFAT fs的支持。
│ │ File systems —>
│ │ DOS/FAT/NT Filesystems —>
│ ┌───────────────────────────-───────┐ │
│ │ <*> MSDOS fs support │ │
│ │ <*> VFAT (Windows-95) fs support │ │
│ │ (936) Default codepage for FAT │ │
│ │ (cp936) Default iocharset for FAT │ │
│ │ < > NTFS file system support
4，加入中文字库
│ │ Native Language Support —>│ │<*> Simplified Chinese charset (CP936, GB2312)│ │<*> NLS UTF8
三，运行系统
插上u盘后会出现如下提示
usb 1-1: new full speed USB device using s3c2410-ohci and address 2
ub(1.6): GetMaxLUN returned 0, using 1 LUNs uba: uba1
然后可执行:mount -t vfat /dev/uba1 /mnt 命令将u盘挂载在/mnt目录下
接受失败也等于给了自己从零开始的机会，接受失败更是一种智者的宣言和呐喊;
