I've installed the 1.5.1 Keil::iMX6_DFP pack but can't find my device. I'm trying to get support for the MCIMX6Y2 device. The 1.2.0 revision shows support for i.MX 6ULL devices was added.
all NXP heterogenous devices i.MX6, i.MX7 or i.MX8 are no longer supported by MDK.
For such a device, please use Arm Development Studio:
https://developer.arm.com/tools-and-software/embedded/arm-development-studio