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why can't i use i2c driver in ubl bootloader?

Other Parts Discussed in Thread: THS8200

hi:
    I want to see splash screen when my borad is power on,so i have to  port i2c driver ,ths8200 driver, vpbe and osd driver to ubl programer(Iit is easyer to debug in ccs3.3 envirment than debug uboot),and i have writed down the  vpbe and osd registers values when linux is booting up if i can see svga pictures, then i  set these values in ubl programmer for relative registers. but when  i port the i2c driver from uboot1.2.0 to ubl programmer,I cann't make the ths8200 work,it seem the i2c driver didn't work well. I am just refering the file dm355_evm.c in uboot1.2.0,it support some usefule functions just as I2C_init(),I2C_write(),I2C_read ()...,and it support communication with msp430.Is it different with ths8200 in i2c communication ? thans a lot!