* How to test remote wakeup (Make sure connecting to usb host and gadget is loaded)
1. Prepare a usb host which featured with remote wakeup
alternatively, You can use another i.mx board (like mx50 rdp, or mx6q)
2. Boot up both boards, and connect two boards with usb cable
3. At device side, do below commands:
- modprobe g_file_storage file=/dev/mmcblk0p1 (other gadgets are also ok)
- echo 1 > /sys/devices/platform/fsl-usb2-udc/gadget/remote_wakeup
4. At host side, do below command:
- echo enabled > /sys/devices/platform/fsl-ehci.1/power/wakeup
- echo standby > /sys/power/state
5. Send Remote wakeup to wake up host
At device side, do below command:
echo 1 > /sys/devices/platform/fsl-usb2-udc/gadget/start_remote_wakeup
6. The expected behaviour is: host is waked up, and there is
not re-enumeration happens.

* How to test usb audio gadget
1. Test Condition
- Host PC, only Macbook Pro (Mac OS 10.6.5+) & Ubuntu 10.10 (Linux 2.6.38+)
are supported, Windows OS are not supported now.
- One USB MicroAB cable and one earphone
2. Test procedure
- Power up the board
- Login in rootfs, load usb audio module with below commands:
modprobe g_audio req_count=20 audio_buf_size=8192 audio_sample_rate=44100
- Connect board with PC using MicroAB cable
- For Ubuntu PC, you can use aplay -l to get the sound card num for this
usb audio gadget, usually the number is 1. For Macbook, you need to choose
"Linux USB Audio Gadget" on the "Sound"->"Output" tab of System Preferences.
- Choose several 44.1Khz wav file to play, you can use aplay or iTune according
to different PCs.
3. Constraints
Since there is no feedback at current usb audio framework,
it may have pop noise/no sound after play some minutes.

How to test auto remote wakeup with the g_zero gadget
1. Prepare a USB host which featured with remote wakeup alternatively, You can
use another i.mx board (like mx50 rdp, or mx6q) for test device board.
2. Boot up both boards, and connect two boards with USB cable.
3. At device side, do below commands:
modprobe g_zero autoresume=3000 interval=1 endms=5000
we can use the above three parameters to control device send resume signal time.
Autoresume is the minimum number of milliseconds before sending resume signal,
and the time before sending resume signal will automatically increase according
to interval value,the endms is the max number of  milliseconds before sending
resume signal.When autoresume is 0 or not be set,the test device auto remote
wakeup function will be disabled.
4. At host side, first do below command:
echo enabled > /sys/devices/platform/fsl-ehci.1/power/wakeup
echo enabled > /sys/bus/usb/devices/1-1/power/wakeup
And you need build a test script to repeat standby the system like below:
while [ 1 ] ;do echo mem  > /sys/power/state;sleep 5 ;done
Then run the test script.
5. Then USB device will enter the suspended state ,and autoresume
milliseconds later,the device will send resume signal to wake up host.
6. The expected behavior is: the host device be waked up, and there is not
re-enumeration happens.
7. The host will enter suspended state again,and test case will repeat step
5 and step 6.