This isn't an issue w/ current git (4.8-rc3+), so I bisected in hunt for
the "fix". I hit this commit:
commit d94ba9e7d8d5c821d0442f13b30b0140c1109c38
Merge: 1c88e19 9573e79
Author: Linus Torvalds <torva...@linux-foundation.org>
Date: Thu Jul 28 17:06:51 2016 -0700
Merge tag 'pinctrl-v4.8-1' of
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
It's a merge commit w/ no conflict resolution. So, pinctrl seems to be a
common theme here - but the root cause is still not clear.
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https://bugs.launchpad.net/bugs/1616672
Title:
4.6.0-11.13 from ckt PPA fails to boot on X-Gene
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Yakkety:
Fix Committed
Bug description:
The 4.6.0-11.13 kernel currently in the ckt ppa fails to boot on
X-Gene systems, such as the Mustang board. Even with earlycon enabled,
there is no output from the kernel on the console (see the attached
console log). The same kernel boots fine on other arm64 systems - this
appears to be X-Gene specific.
A defconfig build boots fine on the same system - so I bisected down
the relevant config change. The results were unexpected, but
CONFIG_ARCH_ROCKCHIP=y appears to be required for X-Gene to boot.
Digging down deeper, I found that the following 2 specific configs are
required (I had to do hack Kconfigs to make them selectable
independent of CONFIG_ARCH_ROCKCHIP):
CONFIG_PINCTRL_ROCKCHIP=y
CONFIG_ROCKCHIP_TIMER=y
Both of which are drivers that do not bind to devices on X-Gene.
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