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Date:      Wed, 28 Feb 2018 19:21:13 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 225182] devel/powerpc64-xtoolchain-gcc: SLOF Data Storage Exception on boot with kernel built with devel/powerpc64-xtoolchain-gcc
Message-ID:  <bug-225182-8-oZWaLVZVF4@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-225182-8@https.bugs.freebsd.org/bugzilla/>
References:  <bug-225182-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225182

--- Comment #21 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Kenneth Salerno from comment #20)

In the likes of:

QUOTE
Loading /boot/defaults/loader.conf                                              
/boot/kernel/kernel data=0xecf0f0+0x3ff050 syms=[0x8+0x13ff98+0x8+0x13f7f4]     
/boot/entropy size=0x1000                                                       
/boot/kernel/geom_label.ko text=0x8450 data=0x14f8+0x8
syms=[0x8+0x1260+0x8+0x1]
can't find 'if_em'                                                              
can't find 'virtio'                                                             
can't find 'if_vtnet'                                                           
can't find 'virtio_pci'                                                         
can't find 'virtio_blk'                                                         

Hit [Enter] to boot immediately, or any other key for command prompt.           
Booting [/boot/kernel/kernel] in 9 seconds...                                   

Type '?' for a list of commands, 'help' for more detailed help.                 
OK boot kernel.test5
END QUOTE                                                            

I do not see evidence of an explicit unloading the prior kernel
before loading the new one. As I remember, on the old PowerMac
G5 I explicitly unload before booting a different kernel,
having observed odd behavior otherwise. (Not that I remember
the oddities any more. The unload is now habit. And the
behavior could be different now if I did not unload first.)


It does look like you are rebuilding and installing the loader
(based on the date, not the "Revision 0.1" that all 3 examples
report), for example:

FreeBSD/powerpc64 Open Firmware loader, Revision 0.1                            
(root@freebsd-amd64.kpsalerno.us.ibm.com, Mon Nov  7 18:55:07 EST 2016)         
vs.
FreeBSD/powerpc64 Open Firmware loader, Revision 0.1                            
(Wed Feb 28 10:41:12 EST 2018 root@freebsd-amd64.kpsalerno.us.ibm.com)          

So I probably misinterpreted Comment #15 (where you did not mention
installkernel , buildworld , or installworld or such).

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