M5Chain-Series-Internal-FW/Chain-ToF/code/README.md

Storage Structure Description

1. FLASH Structure

Start Address	End Address	Region Name	Size	Function Description
0x08000000	0x08001FFF	Boot	8 KB	Stores the bootloader and firmware upgrade logic
0x08002000	0x0800DFFF	App	48 KB	User application program storage area
0x0800E000	0x0800FFFF	Data	8 KB	Stores system parameters

---

2. RAM Structure

Start Address	End Address	Region Name	Size	Function Description
0x20000000	0x20001FFF	Boot	8192 bytes	Used during the boot stage for buffering and variable storage
0x200000C0	0x20001FxFF	App	8000 bytes	Used during application runtime for task stacks, variables, and caching

Note: Boot and App share the same RAM area and occupy their corresponding spaces during different runtime stages.

3. Detailed Description

• Boot Region (8 KB)
  Used to store the bootloader and firmware upgrade control logic.
  The last byte stores the firmware version number for version management and upgrade validation.
• App Region (48 KB)
  Used to store the user application program.
  The last 4 bytes are reserved for CRC checksum storage. The bootloader verifies the program before loading.
  The verification uses the standard CRC-32 algorithm (IEEE 802.3, polynomial 0x04C11DB7, initial value 0xFFFFFFFF, input/output reflected, result bitwise inverted, and stored in little-endian byte order).
• Data Region (8 KB)
  Used to store system parameters.