On Tue, Dec 12, 2017 at 01:24:52PM -0800, Kevin Hilman wrote: > On Tue, Dec 12, 2017 at 9:26 AM, Priit Laes <plaes@xxxxxxxxx> wrote: > > On Mon, Dec 11, 2017 at 02:22:30PM -0800, Kevin Hilman wrote: > >> On Sun, Mar 26, 2017 at 10:20 AM, Priit Laes <plaes@xxxxxxxxx> wrote: > >> > Convert sun4i-a10.dtsi to new CCU driver. > >> > > >> > Signed-off-by: Priit Laes <plaes@xxxxxxxxx> > >> > >> I finally got around to bisecting a mainline boot failure on > >> sun4i-a10-cubieboard that's been happening for quite a while. Based > >> on on kernelci.org, it showed up sometime during the v4.15 merge > >> window[1]. It bisected down to this commit (in mainline as commit > >> 41193869f2bdb585ce09bfdd16d9482aadd560ad). > >> > >> When it fails, there is no output on the serial console, so I don't > >> know exactly how it's failing, just that it no longer boots. > > > > We tried out latest 4.15 with various compilers and it works: > > - gcc version 7.1.1 20170622 (Red Hat Cross 7.1.1-3) (GCC) - A10 Gemei G9 tablet > > - gcc 7.2.0-debian - A10 Cubieboard > > And you can reproduce the bug with gcc5 or gcc6? > > Very strange that a DT only patch would cause a gcc related regression > and if it does, it should be investigated. I don't think requiring > gcc7 is an appropriate solution. > > @Chen-Yu, @Maxime: are you guys OK with requiring gcc7 for working > upstream boot for A10? I'd rather not set that kind of constraints and fix the issue instead. Priit, can you test with an older compiler? You can find one here: http://toolchains.free-electrons.com/ Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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