[U-Boot-Users] Question to install ELDK

Hi. I had download ELDK3.1 for arm(arm-2004-11-09.iso). And I prepared a host environment with a full installation of Red Hat Linux 9, and mount the iso file in my host OS, to execute #./install -d /ELDK arm without errors. Add ELDK's bin directory to $PATH. After doing these, can I use this ELDK compile u-boot? Does the Environment variable CROSS_COMPILE MUST be set?