[U-Boot-Users] thumb-interwork option

Hi everyone, I am trying to compile u-boot for ARM (mc9328mx1), my target board is similar to ADSMX1 board. My problem is that: I compile u-boot succesfully but my binary image doesn't boot at all. The board is death at all. It seems -mthumb-interwork option is needed to let it work. Anyone know how to pass -mthumb-interwork to u-boot compile process? export CFLAGS=-mthumb-interwork does't seem to work.

Thanks.