Linux2.6.24下的USB HOST移植

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);
}

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