Ok. I fixed the dma problem by removing disk 1. Using mac-fdisk with a debian cd: another bootblock, 60G, and 1G partitions were created.
Rebooting into the openbsd install, I am not able to commit the changes to the disk area. I've destroyed then recreated the partition for openbsd. Same results: (A)bort or (M)odify. What am I missing from this? Do I need to create multiple partitions such as with FreeBSD or is there an argument to pass while creating the partition? Can it be done with Linux gpart?