Hi Divyesh
reason may be that i.MX6Q Sabre SD board starts automatically when applied power,
to prevent it one can try to implement additional "OPTIONAL: PMIC Power On Circuit"
described on spf-27392 p.19 Sabre board schematic
Schematics (1)
i.MX6_SABRE_SDP_DESIGNFILES
SABRE Platform for Smart Devices|NXP
Best regards
igor
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