[Bug 237062] boot1.elf cannot find loader on ufs partition, failing to boot on powerpc SLOF

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237062

            Bug ID: 237062
           Summary: boot1.elf cannot find loader on ufs partition, failing
                    to boot on powerpc SLOF
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: sven.siemsen at me.com

To repoduce:

1. Install FreeBSD-12.0-RELEASE in qemu-system-powerpc64
   Use GPT partition scheme, all recommended options.

2. Boot installed system

qemu versions tested: 4.0.0rc1, 3.0.0 on Mac OS X intel in full emulation,
2.11.1 on POWER8 (Ubuntu 18.04, with KVM)

All quemu versions come with different SLOF versions, all fail.
Even a fresh compiled SLOF image from qemu/slof failed.

During testing, it turned out that the loader tries 16 partitions on the given
boot device but fsread() fails to read or identify the UFS superblock on
partition 2.

I don't know what component is failing: qemu, slof, or boot1.elf 


Result:
[...]
Trying to load:  from: /vdevice/v-scsi at 71000002/disk at 8000000000000000 ...  
Successfully loaded

>> FreeBSD/powerpc Open Firmware boot block
   Boot path:   /vdevice/v-scsi at 71000002/disk at 8000000000000000
   Boot loader: /boot/loader
panic: domount

W3411: Client application returned.

E3406: Client application returned an error:    no current instance

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