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# 1.7.3 UDP Bootloader Configurations

Bootloader Specific User Configurations

For Basic Bootloader

For Live Update Bootloader

- Bootloader NVM Memory Used:

  - Specifies the memory peripheral used by bootloader to perform flash operations
  - The name of the peripheral will vary from device to device

- Bootloader Size (Bytes):

  - Specifies the maximum size of flash required by the bootloader
  - This size is calculated based on Bootloader type and Memory used
  - This size will vary from device to device and should always be aligned to device erase unit size

- Enable Bootloader Trigger From Firmware: (Basic Mode Only)

  - This Option can be used to Force Trigger bootloader from application firmware after a soft reset. It does so by reserving the specified number of bytes in SRAM from the start of the RAM. The reserved memory is updated by the application with a pre-defined pattern. The bootloader firmware in the bootloader_Trigger() routine, can check the reserved memory for the pre-defined pattern and enter bootloader mode if the pattern matches.

  - Number Of Bytes To Reserve From Start Of RAM:

    - This option adds the provided offset to RAM Start address in bootloader linker script.
    - Application firmware can store some pattern in the reserved bytes region from RAM start for bootloader to check at reset in bootloader_Trigger() function

- Bootloader UDP Port Number:

  - Port number to be used to communicate via Unified Host Application

- Use Dual Bank For Live Update:

  - Used to configure bootloader library to use Inactive bank of the device to upload the new application

  - This option is visible only for devices supporting Dual flash banks

  - Live Update Flash Bank Size (Bytes):

    - Specifies the size of bank in which both the bootloader and application code reside. Thisvalue by default will be half of the available Flash memory

  - Trigger Reset After Update:

    - This option can be used to trigger a Swap bank and reset immediatly after programming the application in inactive bank.
    - If not enabled, then the application code should call the bootloader_SwapAndReset() function to trigger Swap bank and reset

UDP Configurations

- IPv4 Static Address: 102.168.1.11
  - To be used to configure Unified Host Application
- IPv4 SubNet Mask: 255.255.255.0
- IPv4 Default Gateway Address: 102.168.1.11
- IPv4 Primary DNS: 102.168.1.11

Bootloader System Configurations (Basic Mode Only)

- Application Start Address (Hex):
  - Start address of the application which will programmed by bootloader
  - This value is filled by bootloader when its loaded which is equal to the bootloader size. It can be modified as per user need
  - This value will be used by bootloader to Jump to application at device reset

Bootloader Linker Pre Processor Macros for CORTEX-M based MCUs

- Based on the configurations the above linker pre processor macros will be generated in MPLAB X xc32-ld settings
  - ROM_LENGTH specifies the size of the bootloader

Basic Mode

Live Update Mode