HI Kapil
one can try uboot from official release (uboot-imx-imx_v2014.04):
Board Support Packages (27)
L3.14.28_1.0.0_iMX6QDLS_BUNDLE (REV L3.14.28_1.0.0)
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=RDIMX6SABREBRD&fpsp=1&tab=Design_Tool...
then follow guidelines from Linux Guide, included in that package
Best regards
igor
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