1.未作移植，插入U盘后提示如下
[root@Emux/]#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.代码修改——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.内核配置
>让内核支持热插拔
General setup ---> Support for hot-pluggable devices
>USB驱动设置
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
做完这些后，插入u盘后，内核应该可以识别到u盘，出现：
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，还有下面一句出错提示：
/dev/ub/a: unknown partition table
>使能（DOS分区）CONFIG_MSDOS_PARTITION
File systems ---> Partition Types
---> PC BIOS (MSDOS partition tables) support
以下是我的内核插入u盘后的提示信息：
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设备已经挂载到/dev/ub/a/part1目录下
>加入中文字体库
Native Language Support
---> Simplified Chinese charset (CP936, GB2312)
NLS UTF8
以下是挂载usb设备后的显示：
[root@Emux /]# mount -t vfat -o iocharset=cp936 /dev/ub/a/part1 /mnt
[root@Emux /]# ls /mnt
4.移植小结
>如果想知道内核有没有识别出u盘的话可以执行命令：cat /proc/partitions ，看看插入USB前后分区信息有什么不同就知道了
>另外，如果想让内核把它当成SCSI设备来处理的话
Device Drivers ---> Block devices
---> Low Performance USB Block driver 去掉
Device Drivers --->SCSI device support
---> SCSI disk support 添加
个人觉得使用usb设备的话Low Performance USB Block driver比SCSI disk要好
>一般都会新建一个/dev/sda1的链接指向usb设备的挂载点的，可以在启动文件中使用命令ln -s xxx xxx来建立这个链接
5.问题小结
插入u盘时显示：
[root@/]#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盘时显示：
[root@/]#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
看似没有问题，但是在挂载的时候出现问题：
Unable to load NLS charset cp437
FAT: codepage cp437 not found
添加 File systems-->
Native language support-->
Codepage 437 (United States, Canada)
插入后显示和第二次一样;
挂载的时候出现问题：
Unable to load NLS charset iso8859-1
FAT: IO charset iso8859-1 not found
添加 File systems-->
Native language support-->
NLS ISO 8859-1 (Latin 1; Western European Languages)
如果出现以下问题：
usb 1-1: device descriptor read/64, error -110
解决办法：
修改linux-2.6.24/drivers/usb/host/ohci-s3c2410.c
添加头文件：
#include <asm/arch/regs-clock.h>
在s3c2410_start_hc里增加：
unsigned long upllvalue = (0x78<<12)|(0x02<<4)|(0x03);
while (upllvalue != __raw_readl(S3C2410_UPLLCON))
{
__raw_writel(upllvalue, S3C2410_UPLLCON);
mdelay(1);
}
