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TMS320F28027: bootloader program

Part Number: TMS320F28027
Other Parts Discussed in Thread: C2000WARE

Tool/software:

Hello, I use
F:\ti\c2000\C2000Ware_5_02_00_00\device_support\f2802x0\examples\structs\f28027_flash_kernel
1, ask why the f28027 bootloader program does not need to be burned into the chip, but can also burn the app program through the serial port. How did the bootloader get into the chip?
2. Now I want to upgrade through can communication. How can I change the hardware or software? f28027 itself does not have CAN function.
3, the code can refer to serial_flash_programmer.sln? Is this documented?