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1-Linux Processor SDK--> This is a linux OS, Yocto distribution 2-Linux-RT Processor SDK --> This is again Yocto distribution, but the kernel has the CONFIG_PREEMPT_RT patch integrated. This means that the kernel supports preemption & is capable of processing real time tasks, which have a defined time for execution, irq priority and so on, meaning that the maximum time of execution of a certain task can be calculated or measured reliably for the given application and environment.. You can learn more about the RT linux here: rt.wiki.kernel.org/.../Frequently_Asked_Questions 3- RTOS Processor SDK --> This is a Real Time Operating System developed by TI
