FreeBSD 14 fails to reach bootloader in an LPAR

I've been trying to boot powerpc64 and powerpc64le in a partition on an
IBM S814. The output looks for both basically looks like:

Detected bad memory access to address: fffffffffffffffe
Package path = /packages/boot-mgr
Loc-code = 
Last memory-queue entry @ c472c0 

Return Stack Trace
------------------
@  - c40530 
close-package  - c64040 
(poplocals)  - c3e9e8 
(init-program)  - c8df44 
boot  - c8eacc 
evaluate  - c50290 
invalid pointer - dc4465 
invalid pointer - f 
invalid pointer - f 
catch  - c3cff0 
bt-task-boot-on-this  - d8c92c 
(poplocals)  - c3e9e8 
catch  - c3cff0 
execute-device-method  - c64b4c 
(poplocals)  - c3e9e8 
(select-boot-seq)  - c65ad4 
(poplocals)  - c3e9e8 
evaluate  - c50290 
^8b06880   - 8b06880 
invalid pointer - 39

It then proceeds to kick me back to SMS, where I can try booting again,
and have it fail the same way. Is there anything I can try to get
further?