Messages in this thread | | | Date | Mon, 23 Nov 2015 15:47:34 +0300 | From | Nikita Yushchenko <> | Subject | Re: [RFC/PATCH] arm: do not skip SMP init calls on SMP_ON_UP case |
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>>>>> While running an imx6s boasrd, I got following message in boot log: >>>>> >>>>> [ 0.032414] CPU1: failed to boot: -38 >>>>> >>>>> This looked strange: imx6s is singe-core and kernel perfectly knows >>>>> that. However, for some reason it tries to initialize CPU 1? >>>>> >>>>> I found this to be caused by >>>>> - CONFIG_SMP_ON_UP successfully detects that system is single core, >>>>> - this causes is_smp() to return false, >>>>> - this causes setup_arch() to skip smp_init_cpus() call, >>>>> - this skips board-specific code that sets cpu_possible mask. >>>> >>>> Right, so you should end up with the possible and present masks >>>> containing just one CPU, which should prevent the kernel trying to >>>> bring any secondary CPUs online. >>> >>> Kernel that is running here still tries to init CPU 1 for some reason. >> >> I *guess* cpus node [1] in your dts has more than one cpu entry, could >> you check please? > > Indeed looks so: > > # ls /proc/device-tree/cpus > #address-cells #size-cells cpu@0 cpu@1 name > > But my custom device tree just includes imx6dl.dtsi > > So it is imx6dl.dtsi in linux-imx tree broken?..
Just booted mainline... unline linux-imx, it does not try to init cpu1.
However, imx6dl.dtsi from mainline also has both cpu@0 and cpu@1
So missing piece in linux-imx is elsewhere :(
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