Hi James
difference is fixed erratum ERR010690 : SNVS LP (backup battery domain) reset bug during
power up / power down, rev 1.2 part numbers will be identified with a “B” suffix.
One can refer to i.MX6UL Errata
http://cache.freescale.com/files/32bit/doc/errata/IMX6ULCE.pdf
Best regards
igor
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