Some more detail would help: what have you tried? where are you stuck?
"scatter file" suggests that you're using Keil - yes?
If so, what edition? ISTR scatter files might not be allowed in the free versions?
Have you checked the Keil documentation:
https://www.keil.com/support/man_arm.htm
https://www2.keil.com/mdk5/docs?__KEIL__
Keil's user forum is here:
https://community.arm.com/developer/tools-software/tools/f/keil-forum
When cross-posting the same question to multiple forums, always give links between the threads - so everyone can see the whole story.
