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()
From: Rob Herring <robh+dt@kernel.org>
Date: 2018-08-30 01:06:02
Also in:
linuxppc-dev, lkml
On Wed, Aug 29, 2018 at 7:44 PM Finn Thain [off-list ref] 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