4.6 USB Host 测试

使用USB存储设备插入USB HOST(J9)接口，调试串口会输出检测设备信息。同时，使用将此存储设备挂载至linux系统下对其读写。

# usb 1-2: USB disconnect, device number 6
usb 1-2: new high-speed USB device number 7 using atmel-ehci
usb 1-2: New USB device found, idVendor=0bda, idProduct=0316
usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-2: Product: USB3.0-CRW
usb 1-2: Manufacturer: Generic
usb 1-2: SerialNumber: 20120501030900000
usb-storage 1-2:1.0: USB Mass Storage device detected
scsi host5: usb-storage 1-2:1.0
scsi 5:0:0:0: Direct-Access     Generic- SD/MMC           1.00 PQ: 
0 ANSI: 4
sd 5:0:0:0: [sda] 31116288 512-byte logical blocks: (15.9 GB/14.8 
GiB)
sd 5:0:0:0: [sda] Write Protect is off
sd 5:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't
support DPO or FUA
 sda: sda1 sda2
 sd 5:0:0:0: [sda] Attached SCSI removable disk

# mount /dev/sda1 /mnt/
# echo "hello" > /mnt/hello.txt
# cat /mnt/hello.txt
hello