Hi Sandeep,
For your first question, you can set the variable androidboot.selinux=disabled in the u-boot console to disable selinux. For more detailed information, you can refer to Android_User's_Guide.pdf, chapter 6.3.2.
For your second question, I'm sorry that I don't have an IMX6SX board right now. I can confirm it later once I have the board.
Best regards,
Danwei Luo
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