When i make my board i found $UNDEF_SYM do not work

the following is the make's output is this right? i think this maybe cause my bl start_armboot error ----------------------------------------------------------------------------------------

arm-linux-ld -Bstatic -T /arc_soft/user/kelphon/embed/u-boot-1.0.0/board/greenlake/u-boot.lds -Ttext 0xa0000100 $UNDEF_SYM cpu/pxa/start.o \ --start-group board/greenlake/libgreenlake.a cpu/pxa/libpxa.a lib_arm/libarm.a fs/jffs2/libjffs2.a fs/fdos/libfdos.a fs/fat/libfat.a net/libnet.a disk/libdisk.a rtc/librtc.a dtt/libdtt.a drivers/libdrivers.a drivers/sk98lin/libsk98lin.a post/libpost.a post/cpu/libcpu.a common/libcommon.a lib_generic/libgeneric.a -L /arm/lib/gcc-lib/arm-linux/2.95.3 -lgcc --end-group \ -Map u-boot.map -o u-boot arm-linux-objcopy --gap-fill=0xff -O srec u-boot u-boot.srec arm-linux-objcopy --gap-fill=0xff -O binary u-boot u-boot.bin

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