First, load the filesystem:

GUM>loadb a2000000
kermit>send rootfs.arm_nofpu.jffs2
kermit>connect
GUM>pro on 1:0-1
GUM>jera all && cp.b a2000000 40000 ${filesize}

Now, load the kernel:

GUM>loadb a2000000
kermit>send uImage
kermit>connect
GUM>katinstall 100000
GUM>katload 100000
GUM>bootm