1.未作移植，插入U盤後提示如下

[[email protected]/]#usb 1-1: new full speed USB device using s3c2410-ohci and address 2
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 3
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 4
usb 1-1: device not accepting address 4, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 5
usb 1-1: device not accepting address 5, error -62
hub 1-0:1.0: unable to enumerate USB device on port 1

2.程式碼修改——修改arch/arm/mach-s3c2410/mach-smdk2410.c 
＋＃include <asm/arch/regs-clock.h>
＋＃include <asm/arch/usb-control.h>
＋＃include <linux/device.h>
＋＃include <linux/delay.h>

＋static struct s3c2410_hcd_info usb_sbc2410_info = {
＋ .port[0] = {

＋ .flags = S3C_HCDFLG_USED
＋ }
＋}; 

＋int usb_sbc2410_init(void)
＋{
＋unsigned long upllvalue = (0x78<<12)|(0x02<<4)|(0x03);
＋printk("USB Control, (c) 2006 sbc2410\n");
＋s3c_device_usb.dev.platform_data = &usb_sbc2410_info;
＋while(upllvalue!=__raw_readl(S3C2410_UPLLCON))
＋{
＋__raw_writel(upllvalue,S3C2410_UPLLCON);
＋mdelay(1);
＋}
＋return 0;
＋} 

static void __init smdk2410_map_io(void)
{
s3c24xx_init_io(smdk2410_iodesc, ARRAY_SIZE(smdk2410_iodesc));
s3c24xx_init_clocks(0);
s3c24xx_init_uarts(smdk2410_uartcfgs, ARRAY_SIZE(smdk2410_uartcfgs));
s3c24xx_set_board(&smdk2410_board);
＋usb_sbc2410_init(); 
} 

3.核心配置 
>讓核心支援熱插拔

General setup ---> Support for hot-pluggable devices

>USB驅動設定

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

                                      ---> USB Mass Storage support

                                  USB Monitor

>加入MSDOS FS和VFAT FS支援

File systems ---> DOS/FAT/NT Filesystems

                                     ---> MSDOS fs support

                                             VFAT (Windows-95) fs support

                                             (936) Default codepage for FAT

                                             (cp936) Default iocharset for FAT

做完這些後，插入u盤後，核心應該可以識別到u盤，出現： 
usb 1-1: new full speed USB device using s3c2410-ohci and address 3
ub(1.3): GetMaxLUN returned 0, using 1 LUNs

但是，還有下面一句出錯提示： 
/dev/ub/a: unknown partition table

>使能（DOS分割槽）CONFIG_MSDOS_PARTITION

File systems ---> Partition Types

                                ---> PC BIOS (MSDOS partition tables) support

以下是我的核心插入u盤後的提示資訊： 
usb 1-1: new full speed USB device using s3c2410-ohci and 2
ub(1.2): GetMaxLUN returned 0, using 1 LUNs
/dev/ub/a: p1 
表示usb裝置已經掛載到/dev/ub/a/part1目錄下

>加入中文字型庫

Native Language Support

                               ---> Simplified Chinese charset (CP936, GB2312)

NLS UTF8

以下是掛載usb裝置後的顯示： 
[[email protected] /]# mount -t vfat -o iocharset=cp936 /dev/ub/a/part1 /mnt
[[email protected] /]# ls /mnt

4.移植小結

>如果想知道核心有沒有識別出u盤的話可以執行命令：cat /proc/partitions ，看看插入USB前後分割槽資訊有什麼不同就知道了

>另外，如果想讓核心把它當成SCSI裝置來處理的話

Device Drivers ---> Block devices

                                      ---> Low Performance USB Block driver     去掉

Device Drivers --->SCSI device support

---> SCSI disk support                                 新增

個人覺得使用usb裝置的話Low Performance USB Block driver比SCSI disk要好

>一般都會新建一個/dev/sda1的連結指向usb裝置的掛載點的，可以在啟動檔案中使用命令ln -s xxx xxx來建立這個連結

5.問題小結

插入u盤時顯示：

[[email protected]/]#usb 1-1: new full speed USB device using s3c2410-ohci and address 4   
usb 1-1: device descriptor read/64, error -62                                  
usb 1-1: device descriptor read/64, error -62                                  
usb 1-1: new full speed USB device using s3c2410-ohci and address 5            
usb 1-1: device descriptor read/64, error -62                                  
usb 1-1: configuration #1 chosen from 1 choice 
去掉 Device Drivers--> Real Time Clock

插入u盤時顯示： 
[[email protected]/]#usb 1-1: new full speed USB device using s3c2410-ohci and address 3                usb 1-1: configuration #1 chosen from 1 choice                                  
scsi1 : SCSI emulation for USB Mass Storage devices                             
scsi 1:0:0:0: Direct-Access     Kingston DataTraveler2.0 1.00 PQ: 0 ANSI: 2    
sd 1:0:0:0: [sda] 3903359 512-byte hardware sectors (1999 MB)                   
sd 1:0:0:0: [sda] Write Protect is off                                          
sd 1:0:0:0: [sda] Assuming drive cache: write through                           
sd 1:0:0:0: [sda] 3903359 512-byte hardware sectors (1999 MB)                   
sd 1:0:0:0: [sda] Write Protect is off                                          
sd 1:0:0:0: [sda] Assuming drive cache: write through                           
sda: sda1                                                                      
sd 1:0:0:0: [sda] Attached SCSI removable disk 
看似沒有問題，但是在掛載的時候出現問題： 
Unable to load NLS charset cp437
FAT: codepage cp437 not found 
新增 File systems--> 
                Native language support--> 
                    Codepage 437 (United States, Canada)

插入後顯示和第二次一樣; 
掛載的時候出現問題： 
Unable to load NLS charset iso8859-1                                            

FAT: IO charset iso8859-1 not found 
新增 File systems--> 
                Native language support--> 
                   NLS ISO 8859-1 (Latin 1; Western European Languages) 

如果出現以下問題： 
usb 1-1: device descriptor read/64, error -110 
解決辦法：
修改linux-2.6.24/drivers/usb/host/ohci-s3c2410.c 
新增標頭檔案：
#include <asm/arch/regs-clock.h> 
在s3c2410_start_hc裡增加： 
unsigned long upllvalue = (0x78<<12)|(0x02<<4)|(0x03);
while (upllvalue != __raw_readl(S3C2410_UPLLCON))
{
__raw_writel(upllvalue, S3C2410_UPLLCON);
mdelay(1);
}