CCS/CC2650STK: What's the difference if I copy the driverlib files(from hard disk) to my project tree(file system)?

Jason Lee60 said:

since I want to do driver file level debugging(I found that I couldn't change some values in driver files when CCS searched functions of driver files in RTOS driver folders), so I copied the driver files directly to the project tree and the CCS now search functions from my project tree.

If you simply need the CCS debugger to find the source files during debugging, you can point CCS to the location of the file. Please see this post. This might be an easier solution if your goal is just to do source level debugging of library code, rather than actually modify the driver code.

Jason Lee60 said:

But I found that it something unexpected now happens which is totally different from that in the past, those worked properly in the past now failed... I really don't know why, because the driver files are exactly the same except one is from hard disk and one is under the project tree.

If there are certain driver files you wish to modify it should be fine to copy those over to the project and compile them with the project. That should override the ones in the prebuilt driverlib.lib. It may not be as optimized as the library but the functionality should be the same.