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Starterware/AM3354: AM3354 PDK-RTOS Porting Issue

Part Number: AM3354

Tool/software: Starterware

Dear,

Now I'm trying to use the PDK RTOS 4.00.00.04/pdk 1.0.7 on AM3354 platform. 

When doing the UART porting, there are various issues:

The first questions is the UART LLD usage:  is it a must to use the UART LLD functions?

What's the differences between the project under the fold of "C:\ti\pdk_am335x_1_0_7\packages\MyExampleProjects" and "C:\ti\pdk_am335x_1_0_7\packages\ti\starterware\examples". 

As it is the first time i use this, I need to port the UART driver in a short while, which one is the better choice for me?