For a RAPH800 I used this setup.txt to get mine working. Mine scrolled for about 30m also and I rebooted and changed some things around. I think I found a typo in his setup.txt that had imgname as zmgname. I forget - this one works for me.
Code:
set ramsize 0x6000000
set ramaddr 0x10000000
set mtype 2039
set KERNEL zImage
set initrd initrd.gz
set cmdline "root=/dev/ram0 init=/ console=tty0 mem=76M imgdevname=/dev/mmcblk0p1 imgdevnum=1 imgdir=/ msmts_calib=0x81.0x393.0x358.0x7D clock-7x00.a11=500 msmvkeyb_toggle=off"
boot