Micro U-Boot Sti7100 SH4

I'm looking for programers, who be able to write small bootloader in assembler language, moreover this loader should be less then 512 bytes. Loader must be designed for satteliter receiver based on STI7100 microprocessor (SH4 architecture) This program have to initialize RAM memory and load from uart intereface u-boot file (I have prepared uboot for this board) and execute it.