I would recommend downloading the Yocto BSP release as it contains more codecs than the Community BSP. Are you working on the BSP release or the community BSP?
You may find the steps to download the i.MX6 BSP Release on the L3.10.17 i.MX6 Documentation Bundle available on the documentation page. Please look for L3.10.17_1.0.0_LINUX_DOCS (Linux 3.10.17 BSP & MM Bundle)
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=i.MX6Q&fpsp=1&tab=Design_Tools_Tab
Then look for Freescale Yocto Project User's Guide.
Just to ease things the key information would be the repo which is:
$ mkdir fsl-release-bsp
$ cd fsl-release-bsp
$ repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.10.17-1.0.0_ga
$ repo sync
$ MACHINE=< machine name> source fsl-setup-release.sh -b <build directory> -e <backend fb,
dfb, wayland, x11>