Bootloader TFTP

The 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 limitation for the firmware file to be uploaded is given by the RAM available:

MCU	RAM	Firmware size
GD32F107RC	96K	74K
GD32F207RG	256K	234K
GD32F207VC	128K	106K
GD32F407RE	128K	106K
GD32F450VI	512K	224K

The bootloader is active during reset of the board:

• Or when the KEY_BOOTLOADER_TFTP_GPIO_PINx is pressed.
• Or when bkp_data_read(BKP_DATA_1) == 0xA5A5. This is set in your application by means of human readable UDP messages.

The bootloader can be installed with the tools supplied by GigaDevice:

• GD32F107
• GD32F207
• GD32F407
• GD32F450

There is a sample Java UI available for installing the firmware: GD32F-Firmware-Update-UI