11、ARM Cortex - M Memory Management: A Comprehensive Guide

ARM Cortex - M Memory Management: A Comprehensive Guide

1. Memory Mapping Basics

In ARM Cortex - M microcontrollers, memory mapping involves assigning specific memory regions for different purposes. Only small sections, equivalent in size to physical components, are mapped within these regions. Trying to access unmapped memory triggers a CPU exception. When working with a target platform, it’s crucial to know the locations and sizes of memory sections corresponding to the hardware to accurately describe the available address space in the linker script and source code.

1.1 Code Region

The lowest 512 MB of the Cortex - M addressing space is reserved for executable code. Targets supporting XIP (Execute - In - Place) map flash memory in this ar