This is what the datasheet says:
"
4.3 Integrated LDO Voltage Regulator Parameters
Various internal supplies can be powered ON from internal LDO voltage regulators. All the supply pins
named *_CAP must be connected to external capacitors. The onboard LDOs are intended for internal use
only and should not be used to power any external circuitry"
The i.MX6 has internal LDO regulators, which are used to change the voltage
to support DVFS / CPU_FREQ features of Linux. Please refer to section 10.4 (Power management)
of the i.MX6 DQ RM.
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf?fasp=1
Have a great day,
Yuri
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