Hi shengshi,
About the MFG Tool , you can dowload this tool from freescale offical website:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=i.MX6Q&fpsp=1&tab=Design_Tools_Tab
Programmers (Flash, etc.) (5)
----IMX_6DQ_MFG_TOOL
Then decompress it , enter it's path and find OS Firmware subdirectory, there is file named mksdcard-android.sh.
Have a great day,
Dan
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