[U-Boot-Users] why can not make u-boot.bin smaller via cutting u-boot command?

hi,all: I compiled u-boot for marvell db88f5181 board,and u-boot.bin is 449kb,it too big for porting. I want to cut u-boot,but after i cut some u-boot commands via cutting *.o files under u-boot*/common/Makefile, then make u-boot, but u-boot.bin size still be 449kb? why?

What's the best way to cut u-boot?

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