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

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

            Bug ID: 277097
           Summary: FreeBSD fails to boot on PowerNV with current
                    Petitboot revisions
           Product: Base System
           Version: 14.0-STABLE
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: powerpc
          Assignee: ppc@FreeBSD.org
          Reporter: tpearson@raptorengineering.com

With the current upstream stable release of Petitboot (v1.15) FreeBSD fails to
boot.  The last output seen on the console comes from the bootloader itself:

   SIGTERM received, booting...

In debugging mode the last kernel messages from the bootloader are:

    SIGTERM received, booting...
    [  166.762499] xhci_hcd 0003:01:00.0: remove, state 1
    [  166.762554] usb usb4: USB disconnect, device number 1
    [  166.764014] xhci_hcd 0003:01:00.0: USB bus 4 deregistered
    [  166.764126] xhci_hcd 0003:01:00.0: remove, state 1
    [  166.764180] usb usb3: USB disconnect, device number 1
    [  166.764261] usb 3-3: USB disconnect, device number 2
    [  166.764309] usb 3-3.1: USB disconnect, device number 4
    [  167.017917] usb 3-3.4: USB disconnect, device number 6
    [  167.194222] usb 3-4: USB disconnect, device number 3
    [  167.194271] usb 3-4.4: USB disconnect, device number 5
    [  167.340586] xhci_hcd 0003:01:00.0: USB bus 3 deregistered
    [  167.340793] xhci_hcd 0001:01:00.0: remove, state 1
    [  167.340841] usb usb2: USB disconnect, device number 1
    [  167.340895] usb 2-3: USB disconnect, device number 2
    [  167.352973] xhci_hcd 0001:01:00.0: USB bus 2 deregistered
    [  167.353095] xhci_hcd 0001:01:00.0: remove, state 1
    [  167.353141] usb usb1: USB disconnect, device number 1
    [  167.353200] usb 1-1: USB disconnect, device number 2
    [  167.516817] xhci_hcd 0001:01:00.0: USB bus 1 deregistered
    [  168.212042] sd 0:0:0:0: [sda] Synchronizing SCSI cache
    [  168.217010] kexec_core: Starting new kernel
    [  168.229031] kexec: waiting for cpu 4 (physical 12) to enter 1 state
    [  168.229955] kexec: waiting for cpu 6 (physical 14) to enter 1 state
    [  168.230028] kexec: wait


This failure is observable with the latest Raptor PNOR version 2.10.  A
temporarily workaround is to downgrade the platform PNOR firmware to version
2.00 until this bug is resolved.

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