mkinitrd failure

Hello all: I am trying to build in initrd fail for a kernel that I compiled. I want to use my 3Ware ATA raidcard as a module. So I made sure the module was added to the /etc/sysconfig/kernel file and did the following: ==================================================================== falcon:/boot # mkinitrd -k linux-2.4.21-2 -i initrd-linux-2.4.21-2 using "/dev/sda1" as root device (mounted on "/" as "reiserfs") creating initrd "/boot/initrd-linux-2.4.21-2" for kernel "/boot/linux-2.4.21-2" (2.4.21) failed to mount image ==================================================================== The failure message is: failed to mount image. No /boot/initrd-linux-2.4.21-2 file was created. Any ideas what I am doing wrong? Thanks. JIm