[Bug 277097] FreeBSD fails to boot on PowerNV with current Petitboot revisions

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277097

--- Comment #2 from Timothy Pearson <tpearson@raptorengineering.com> ---
Looks like FreeBSD is causing a checkstop:

 20.47361|================================================
 20.49547|Error reported by prdf (0xE500) EID 0x900000A8
 20.49548|  PRD Signature            : 0x70001 0xDD3F000E
 20.53654|  Signature Description    : pu.core:k0:n0:s0:p00:c1 (COREFIR[14])
Machine check and ME = 0 Err
 20.53772|  UserData1   : 0x0007000100000101
 20.53773|  UserData2   : 0xdd3f000e00000000
 20.53774|------------------------------------------------
 20.53774|  Callout type             : Procedure Callout
 20.53775|  Procedure                : UNKNOWN: 0x11
 20.53776|  Priority                 : SRCI_PRIORITY_HIGH
 20.53777|------------------------------------------------
 20.53778|  Callout type             : Hardware Callout
 20.53781|  Target                   : Physical:/Sys0/Node0/Proc0/EQ0/EX0/Core1
 20.53782|  Deconfig State           : NO_DECONFIG
 20.53782|  GARD Error Type          : GARD_NULL
 20.53783|  Priority                 : SRCI_PRIORITY_MED
 20.53784|------------------------------------------------
 20.53785|  System checkstop occurred during runtime on previous boot
 20.53786|------------------------------------------------
 20.53787|  Hostboot Build ID:
 20.53788|================================================

From what I understand, this checkstop signature is caused by a double fault,
i.e. a machine check exception triggered inside of another machine check
exception handler.

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