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Subject: Re: v4.17 regression: PowerMac G3 won't boot, was Re: [PATCH v5 1/3]
 of: cache phandle nodes to reduce cost of of_find_node_by_phandle()
To: Rob Herring <robh+dt@kernel.org>
Cc: fthain@telegraphics.com.au, Frank Rowand <frank.rowand@sony.com>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Chintan Pandya <cpandya@codeaurora.org>, devicetree@vger.kernel.org,
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Date: Thu, 30 Aug 2018 20:39:44 -0600
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On 8/29/18 7:05 PM, Rob Herring wrote:

> On Wed, Aug 29, 2018 at 7:44 PM Finn Thain <fthain@telegraphics.com.au> wrote:
>> Hi Frank,
>>
>> Linux v4.17 and later will no longer boot on a G3 PowerMac. The boot hangs
>> very early, before any video driver loads.
>>
>> Stan and I were able to bisect the regression between v4.16 and v4.17 and
>> arrived at commit 0b3ce78e90fc ("of: cache phandle nodes to reduce cost of
>> of_find_node_by_phandle()").
>>
>> I don't see any obvious bug in 0b3ce78e90fc or b9952b5218ad. But if you
>> revert these from v4.18 (which is also affected) that certainly resolves
>> the issue.
> Perhaps a bad assumption on phandle values causing a problem. Can you
> provide a dump of all the phandle or linux,phandle values from
> /proc/device-tree.
>
> Rob

Rob,

As suggested by Finn, I installed device-tree-compiler and
powerpc-ibm-utils.
 
Running "dtc -I fs -H both /sys/firmware/devicetree/base"
resulted in the following errors:

DTC: fs->dts on file "/sys/firmware/devicetree/base"
ERROR (name_properties): "name" property in
/pci/multifunc-device/pci1799,1#1 is incorrect ("pci1799,1" instead of
base node name)
ERROR (name_properties): "name" property in /pci/mac-io/ide#1 is
incorrect ("ide" instead of base node name)
ERROR (name_properties): "name" property in
/pci/mac-io/ide#1/atapi-disk#1 is incorrect ("atapi-disk" instead of
base node name)
ERROR (name_properties): "name" property in /cpus/PowerPC,750/l2-cache#1
is incorrect ("l2-cache" instead of base node name)
ERROR: Input tree has errors, aborting (use -f to force output)

If I force output with "-f", the resulting file has no occurrences 
of "phandle".

Running "lsprop /proc/device-tree | grep -i phandle" results in no 
output.

Please let me know if there's some other way to get information that 
would be helpful.

thanks

-Stan