I've tried Barryallen on dm800se a8p and on dm800se sim2.10 boxes. I was able to get them work ok, but there were always a problem on them: after a while I got my usb pen filesystem corrupted and I had it to repair with linux filesystem repair tools. This happens always to me, just a metter of time.
I' ve tried different usb pen different sizes, ext3, ext4 formatting but no success. So I decide to use ItalyBoot multiboot. I had to put Italysat image in flash, but since that I could install all images in multiboot with no problem.
Only issue is that you have mount manually your usb device in the multiboot image or add it in the startup sequence in init.d