[Bug 226365] ppc64: Loader: Unable to load two kernels

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226365

            Bug ID: 226365
           Summary: ppc64: Loader: Unable to load two kernels
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: breno.leitao at gmail.com

I am not able to load two kernels in the loader. If I want to load a newer
kernel, I need to unload the first one, otherwise it gets in the OFW trap.
Example:


>> FreeBSD/powerpc Open Firmware boot block
   Boot path:   /vdevice/v-scsi at 2000/disk at 8000000000000000
   Boot loader: /boot/loader
   Boot volume:   /vdevice/v-scsi at 2000/disk at 8000000000000000:2
Consoles: Open Firmware console  

FreeBSD/powerpc64 Open Firmware loader, Revision 0.1
(Sun Feb 18 22:29:36 CET 2018 root at free8)
Memory: 8388608KB
Booted from: /vdevice/v-scsi at 2000/disk at 8000000000000000

Loading /boot/defaults/loader.conf
/boot/kernel/kernel data=0x129ebb0+0x4ccf90 syms=[0x8+0x16d370+0x8+0x1698ac]
/boot/entropy size=0x1000

Hit [Enter] to boot immediately, or any other key for command prompt.


Type '?' for a list of commands, 'help' for more detailed help.
OK load /boot/kernel.old/kernel
/boot/kernel.old/kernel data=0x129db60+0x4ccf60  

( 700 ) Program Exception [ 0 ]


    R0 .. R7           R8 .. R15         R16 .. R23         R24 .. R31
0000000032fc6a70   0000000002c04000   0000000000000000   000000005f690000   
0000000002c46a70   00000000000001b4   0000000000000000   0000000000008000   
0000000000000000   000000000344bca4   0000000002c46ad8   0000000002c72080   
000000000000005c   0000000002c442dc   0000000002c46adc   0000000000000000   
ffffffffffffffef   0000000000fd0000   0000000000000000   0000000000fd0000   
0000000000000000   0000000000000000   0000000000007fff   0000000002c69fc0   
00000000000001fa   0000000000000000   0000000002c46b1c   0000000000000000   
0000000002c46a88   0000000000000000   0000000002c46adc   00000000000001fa   

    CR / XER           LR / CTR          SRR0 / SRR1        DAR / DSISR
        88020028   0000000002c3b20c   0000000002c02328   0000000000000000   
0000000000000000   0000000002c2f160   0000000000083000           00000000   


Since the loader is claiming a specific memory area from the OFW, it does not
fit both kernel. We should, either, ask for more memory for the newer kernel,
or, reuse the same memory as used in the first kernel.

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