Linux2.6.24下的USB HOST移植

来源：互联网发布：js jsonarray 长度编辑：程序博客网时间：2024/05/19 01:12

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);
}