Android Factory Data Reset

今天看了看Android做Master Clear的过程，记录如下：

1. Call function RecoverySystem.rebootWipeUserData().

2. Save the parameter –wipe_date into /cache/recovery/command.

3. Do PowerManager.reboot() and reboot into Recovery model. Recovery source code is /bootable/recovery

4. Recovery kernel read parameter from /cache/recovery/command then call function wipe_data();

5. Execute function format_volume() to clear “/data” and “/cache” partitions.

6. Eventually, the function mtd_write_partition() is called to re-build the data and cache partitions.

7. Then do reboot to launch the normal power on.