Hi JooWon
please read document below describing basic steps
http://2012ftf.ccidnet.com/pdf/0066.pdf
Below you will find Freescale BSPs
i.MX6Q|i.MX 6Quad Processors|Quad Core|Freescale
Operating System Software-Board Support Packages (34)
If MFG Tool can not connect to board - for this problem I would
suggest to create separate thread, since this is hardware problem and may
be answered in different thread. As starting point suggest to run DDR tests
https://community.freescale.com/docs/DOC-96412
Best regards
igor