In the Linux source tree (arch/arm/boot/dts), there are .dtsi files for the i.MX6Quad (imx6q.dtsi), the i.MX6DualLite (imx6dl.dtsi), the i.MX6SoloLite (imx6sl.dtsi), and definitions common to the entire family (imx6qdl.dtsi). But I can't seem to find one that's specific to the i.MX6Dual. If it weren't for the two extra core definitions, I'd use imx6q.dtsi, since I'm led to believe the Quad and the Dual are substantially identical.
Any hints?
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Yes, you should use imx6q.dtsi. When the kernel boots it will only bring up two cores online.