port-macppc/52960: oea_startup: failed to allocate DEAD Zone: error=12

[venture37%geeklan.co.uk@localhost]

>Number:         52960
>Category:       port-macppc
>Synopsis:       oea_startup: failed to allocate DEAD Zone: error=12
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 29 00:05:00 +0000 2018
>Originator:     Sevan Janiyan
>Release:        7/8/current
>Organization:
>Environment:
NetBSD 8.0_BETA macppc powerpc
>Description:
oea_startup() in src/sys/arch/powerpc/oea/oea_machdep.c attempts to "allocate away the pages that map to 0xDEA[CDE]xxxx" as said in the comment by the call to uvm_map() fails. I've tried playing with the size & value fields in the uvm_map call without luck (or clue). 
>How-To-Repeat:
Boot a NetBSD/macppc kernel & dmesg output.
>Fix: