Read this in other languages: English, 中文.

语言版本: English, 中文.

A Bootloader for Larger Capacity Firmware/Firmware Switching on Quansheng UVK5

Functional Description

• Reads firmware from EEPROM and writes it to flash to switch firmware.
• Reads valid firmware stored in EEPROM and allows selection via a button press.

Principle Explanation

• The DP32G030 chip has 64KB of flash and 16KB of RAM.
  • Out of the 64KB flash, 4KB is used for the bootloader that writes programs, leaving 60KB for custom firmware.
  • Due to the flash size limitation, the custom firmware can only be up to 60KB.
  • The custom firmware requires slightly less than 4KB of RAM to store data, and 128B of stack space, leaving about 12KB.
  • A small program can be added to the custom firmware with the following content:
    • Triggered by a certain button press.
    • Reads the bootloader of this project from the EEPROM and loads it to the last 12K address in the RAM.
    • Jumps to the RAM to execute the bootloader of this project.
    • The bootloader reads valid firmware from the EEPROM and allows selection via a button press.
    • The selected firmware is read from the EEPROM, written to the flash, and then jumps to the entry address of the firmware.
    • After startup, firmware switching/APP loading is achieved.

Conditions of Use

• Due to language requirements, approximately 150KB is needed for Chinese input method, so this bootloader is only suitable for UVK5 with 4MiB (512KB) EEPROM.
• For each firmware stored in the EEPROM, approximately 250B of a jump program segment is required to load the bootloader to RAM, which is simple.
• Due to flash size limitations, the size of a single firmware still cannot exceed 60KB.

Sponsorship

If this project has been helpful to you, consider donating to support the development work.

Here is the Sponsorship List. Many thanks to everyone for their support!

Donation code:

Disclaimer:

• No Liability
• The radio may become bricked during the flashing process, for which I am not responsible.
• I do not assume any legal responsibility. This project is open-source, and you are free to use it, but you must take responsibility for your actions.