[U-Boot] at91rm9200 undef runtime error with eldk 5.0

Hi, everybody:

I'am using a board similar to at91rm9200ek, u-boot version is v2011.03.

Early I use eldk4.2 to build u-boot, all things ok, but eldk 4.2 can't compile busybox whith ubiattach enabled. So I change my toolchain to eldk5.0 (eldk-eglibc-i686-arm-toolchain-gmae-5.0.tar.bz2, poky-image-sato-sdk-armv5te.tar.gz). Now the make process all ok. But when download u-boot.bin to the board. the code say:

-F- Undef detected

eldk5.0-armv5te CAN'T used for arm920t ??? Is this true?

anybody help me!