ATMEGA644 Serial Bootloader

I need an embedded software for atmega644 device. there must be designed uart bootloader. There are 2 parts of this project GUI and Embedded parts. Actually I need 2 software. One of them is embedded, one of them is GUI Embedded Part: There are 3 necessary points; 1-)It must be designed at iar embedded workbench with c programming language (i prefer v5.50) 2-)ı have another src that is doing some motor control. but it is also communicate with GUI at 9600baud rate in run time. I want to merge bootloader code with my motor control code. What ı want is, At runtime if spesific bootloader message is received, bootloader code must run and eliminate other flash parts. After that baud rate must change 9600 to 115200(or max speed maybe 57600). and download to code with that speed. After succesful booloading, it has to change its baud to 9600, And then sends finish signal to gui after restart system. 3-) i can share 3 kb flash area for bootloader src from my motor control code. For GUI part: there must be bootloader gui with console application works with windows. there are 5 necessary points: 1-) when starts gui, gui must communicate with embedded sw with 9600baud. Because main embedded rutine will be running at 9600. After that GUI must change embedded boards work mode to bootloader mode. 2-) In bootloader mode GUI and embedded board must work with 115200baud (max baud that supports maybe 57600) 3-) GUI must send program and after succesful download it must show user that is succesful. 4-) GUI must verify code. 5-) If there are some problems with downloading, it must stop downloading and warn the user. To re-try.