1.unable to enumerate USB device on port 1
出现这个问题，电压不够或者USB走线有干扰。
2.new config #1 exceeds power limit by 60mA
shell@android:/ # [ 202.946798] usb 2-1.2: USB disconnect, device number 5
[ 205.229143] usb 2-1.3: new full speed USB device number 6 using usb20_host
[ 205.332891] usb 2-1.3: New USB device found, idVendor=0b57, idProduct=8021
[ 205.332976] usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 205.333031] usb 2-1.3: Product: Tablet
[ 205.333059] usb 2-1.3: Manufacturer: HanWang
[ 205.333452] usb 2-1.3: new config #1 exceeds power limit by 60mA
[ 205.335828] usb 2-1.3: 160mA is over 100mA budget for port 3!
shell@android:/ #
快速的解决方法：中间连接一个USB HUB。
3. no configuration chosen from 1 choice
usb 2-1.3: new high-speed USB device number 13 using dwc2
usb 2-1.3: New USB device found, idVendor=8644, idProduct=800b
usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-1.3: Product: USB Flash Disk
usb 2-1.3: Manufacturer: General
usb 2-1.3: SerialNumber: 000000000000BC30
usb 2-1.3: rejected 1 configuration due to insufficient available bus power
usb 2-1.3: no configuration chosen from 1 choice
Fix:临时解决方案 echo -n 1 > /sys/bus/usb/devices/2-1.3/bConfigurationVusb如下：
2-1.3: new config #1 exceeds power limit by 400mA
alue
usb-storage 2-1.3:1.0: USB Mass Storage device detected
scsi host0: usb-storage 2-1.3:1.0
miniroot# scsi 0:0:0:0: Direct-Access General USB Flash Disk 1.00 PQ: 0 ANSI: 2
sd 0:0:0:0: [sda] 31299584 512-byte logical blocks: (16.0 GB/14.9 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] No Caching mode page found
sd 0:0:0:0: [sda] Assuming drive cache: write through
sda: sda1
sd 0:0:0:0: [sda] Attached SCSI removable disk
i2c--2.6.34文档：如何枚举产生i2c_client：http://www.linuxdiyf.com/linux/5310.html
Linux下Gtkmm枚举目录中所有文件（包含子目录）：http://www.linuxdiyf.com/linux/6820.html
Backtrack5安装配置和功能枚举：http://www.linuxdiyf.com/linux/2890.html