Power7 boot fail

I have been working on testing BSD 15.1 on an IBM Power7.
IBM 8202 Model E4C

I am booting via USB using SMS. The system does see the boot device and I
have successfully used the same USB device to boot into linux. I am getting
the following error when using normal mode.

Detected bad memory access to address: fffffffffffffffe
Package path = /packages/boot-mgr

I am getting the same error on 14.4, both 14.4 and 15.1 were using the
bootonly iso.

Tom