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GD32F450VI Bootloader TFTP

This bootloader will install your application by means of the TFTP protocol. There is no need to change your application code. Per default DHCP is used for obtaining the ip-address.

The bootloader is active during reset of the board:

Otherwise the bootloader will directly jump to your application. With the snippet:

    	// 8. Call the reset handler
    	const uint32_t* reset_p = (uint32_t *)(FLASH_BASE + OFFSET_UIMAGE + 4);
    	asm volatile ("bx %0;" : : "r"(*reset_p));

The bootloader can be installed with the tools supplied by GigaDevice -> http://www.gd32mcu.com/en/download/7?kw=GD32F4

The limitation for the firmware file to be uploaded is given by the RAM available. With the 256K RAM (RAMADD) we have no firmware file size limit with the 224K avaiavle flashrom.

See also https://www.gd32-dmx.org/bootloader.html

File: spiflashinstall.h

# elif defined (BOARD_GD32F450VI)
#  define OFFSET_UIMAGE		0x008000		// 32K
#  define FIRMWARE_MAX_SIZE (224 * 1024)	// 224K
# endif

There is just 224KB flash starting at 0x08008000

The change to be made in your build configuration is in the file gd32f450vi_flash.ld .

MEMORY
{
  FLASH (rx)      : ORIGIN = 0x08008000, LENGTH = 256K - 0x8000
  TCMSRAM (rw)    : ORIGIN = 0x10000000, LENGTH = 64K
  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 192K
  RAMADD (xrw)    : ORIGIN = 0x20030000, LENGTH = 256K
  BKPSRAM (rw)	  : ORIGIN = 0x40024000, LENGTH = 4K
}

The FLASH ORIGIN must match the OFFSET_UIMAGE from the bootloader file spiflashinstall.h

The code for the bootloader is a fork from https://github.com/vanvught/rpidmx512. In order to reduce the memory footprint, some functions are not available.