实验八 USB驱动的移植
【实验目的】
USB接口是现在计算机系统中最通用的一种接口，
说明：在本系统移植课程实验中命令行提示符 “$”表示是在主机上执行，“#”表示在目标板执行
【实验环境】
• 主机：ubuntu 12.04发行版
• 目标机：FS4412平台
• 交叉编译工具：arm-none-linux-gnueabi-gcc
【实验步骤】
1. 修改设备树文件
$vim arch/arm/boot/dts/exynos4412-fs4412.dts
添加如下内容：
usbphy: usbphy@125B0000 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "samsung,exynos4x12-usb2phy";
reg = <0x125B0000 0x100>;
ranges;
clocks = <&clock 2>, <&clock 305>;
clock-names = "xusbxti", "otg";
usbphy-sys {
reg = <0x10020704 0x8 0x1001021c 0x4>;
};
};
ehci@12580000 {
status = "okay";
usbphy = <&usbphy>;
};
usb3503@08 {
compatible = "smsc,usb3503";
reg = <0x08 0x4>;
connect-gpios = <&gpm3 3 1>;
intn-gpios = <&gpx2 3 1>;
reset-gpios = <&gpm2 4 1>;
initial-mode = <1>;
};
2. 配置内核
make menuconfig
Device Drivers --->
[*] USB support --->
<*> EHCI HCD (USB 2.0) support
<*> EHCI support for Samsung S5P/EXYNOS SoC Series
<*> USB Mass Storage support
<*> USB3503 HSIC to USB20 Driver
USB Physical Layer drivers --->
<*> Samsung USB 2.0 PHY controller Driver
SCSI device support --->
<*> SCSI device support
<*> SCSI disk support
<*> SCSI generic support
3. 编译内核和设备树
$ make uImage
$ make dtbs
4. 测试：
拷贝内核和设备树文件到/tftpboot目录下
$ cp arm/arm/boot/uImage /tftpboot
$cp arch/arm/boot/dts/exynos4412-fs4412.dtb /tftpboot/
启动目标板并在目标板上完成如下操作：
插入U盘显示如下
[ 72.695000] usb 1-3.2: USB disconnect, device number 3
[ 74.435000] usb 1-3.2: new high-speed USB device number 4 using exynos-ehci
[ 74.555000] usb-storage 1-3.2:1.0: USB Mass Storage device detected
[ 74.560000] scsi1 : usb-storage 1-3.2:1.0
[ 75.645000] scsi 1:0:0:0: Direct-Access Kingston DataTraveler 160 PMAP PQ: 0 ANSI: 4
[ 75.660000] sd 1:0:0:0: Attached scsi generic sg0 type 0
[ 76.695000] sd 1:0:0:0: [sda] 15556608 512-byte logical blocks: (7.96 GB/7.41 GiB)
[ 76.700000] sd 1:0:0:0: [sda] Write Protect is off
[ 76.705000] sd 1:0:0:0: [sda] No Caching mode page found
[ 76.710000] sd 1:0:0:0: [sda] Assuming drive cache: write through
[ 76.725000] sd 1:0:0:0: [sda] No Caching mode page found
[ 76.730000] sd 1:0:0:0: [sda] Assuming drive cache: write through
[ 76.760000] sda: sda1 (sda是设备名sda1是分区名)
[ 76.770000] sd 1:0:0:0: [sda] No Caching mode page found
[ 76.770000] sd 1:0:0:0: [sda] Assuming drive cache: write through
[ 76.780000] sd 1:0:0:0: [sda] Attached SCSI removable disk
在终端上执行挂载的设备与上边显示相关
# mount -t vfat /dev/sda1 /mnt
# ls
可以查看到U盘内容，即完成实验。