linux2.6.37.4内核在XC2440开发板上移植（八）USB HOST驱动移植

内核里已经做好了很完善的USB Host驱动了，可以支持大多数USB设备（如U盘，USB键盘鼠标等），同时也支持USB HUB。

在mach-xc2440.c中添加USB Host驱动的支持：

xc2440_devices[ ]结构体中加入：

&s3c_device_ohci,

s3c_device_ohci结构体的实现文件为/arch/arm/plat-samsung/dev-usb.c，系统默认没有对它的编译支持，修改同目录下的Kconfig文件：

config S3C_DEV_USB_HOST
    bool
    default  y
    help
        Compile in platform device definition for USB host.

或修改arch/arm/mach-s3c2440/Kconfig文件：

config MACH_XC2440
    bool "XC2440 development board with S3C2440 CPU module"
    select CPU_S3C2440
    select S3C_DEV_NAND
    select S3C_DEV_USB_HOST
    help
        Say Y here if you are using the XC2440 development board.

配置内核，支持USB Host：

Device drivers --->
    SCSI Device support --->
        <*> SCSI device support
<*> SCSI disk support
    [*] HID Devices --->
-*-  Generic HID support
<*> USB Human Interface Device (full HID) support
    [*] USB support --->
{*}   Support for Host-side USB
[*]   USB announce new devices
[*]   USB device filesystem
<*>  OHCI HCD support
<*>  USB Mass Storage support

USB Human Interface Device (full HID) support 是对USB鼠标键盘的支持

SCSI disk support 和USB Mass Storage support 是对U盘的支持

系统启动时的调试信息：

s3c2410-ohci s3c2410-ohci: S3C24XX OHCI

s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1

s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000

usb usb1: New USB device found, idVendor=1d6b, idProduct=0001

usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1

usb usb1: Product: S3C24XX OHCI

usb usb1: Manufacturer: Linux 2.6.37.4 ohci_hcd