Hi, On 03/06/2015 08:40 PM, Mark Rutland wrote: >>>>>> CPU0 (boot CPU) is only well working for CPU_OFF. >>>>>> But when I try to turn on the CPU0 after CPU_OFF, I failed it. >>>>> >>>>> That's rather worrying. Can you look into what's going on here? I'd >>>>> rather not have dts describing things which are known to be broken. >>>> >>>> The board dts don't include any node for CPU_ON/OFF. >>> >>> I don't understand. The CPU_ON and CPU_OFF IDs are in the psci node >>> quoted above, and all the CPUs had enable-method = "psci". >> >> I mean that there are not additional dt node except for 'cpu' and 'psci' node. > > The psci node and cpu enable-method are sufficient. No other nodes > should be relevant. You're right. > >>> >>>> When I try to turn on the CPU0 (boot CPU), fail to turn on and lockup happen. >>>> After lockup happen, I cannot use the console. >>> >>> That sounds like a pretty major bug. >>> >>> Are you able to investigate with a hardware debugger? >> >> I can't do because there are not any jtag connector. > > That is very unfortunate. Which PSCI implementation are you using? > Surely whoever developed it has access to debug. Surely they should have > tested this? I just used the lateset Linux 4.0-rc2 for PSCI (arch/arm64/kernel/psci.c) without any modification. Unfortunately, I don't know who is the h/w developer of Exynos5433 SoC. > >>> Do other CPUs eventually log errors regarding the lockup? Or is the >>> machine completely dead from this point on? >> >> I tested CPU0 on/off. When I turn on the CPU0, I fail it. But, kernel just show the error log without lockup. >> I gave you wrong infromation about CPU0 off. > > Ok. However that's still a major bug. > > [...] > >>>>>>> I take it CPUs boot at EL2? >>>>> >>>>> Do the CPUs boot at EL1 or EL2? >>>> >>>> Unfortunately, I cannot check the secure firmware for Exynos5433 SoC. >>>> I think that a few SoC provider probably would know it. >>> >>> I guess I asked the wrong question. >>> >>> Do CPUs enter the kernel at EL2 or at EL1? >> >> Could you give me a tip how to check the kernel at EL2 or EL1? > > Hmm... I thought we logged this but it looks like we don't. > > You could hack in a check of is_hyp_mode_available() and > is_hyp_mode_mismatched(). That will tell you if EL2/hyp is available, > and whether all CPUs enter at the same mode (mandatory per the boot > protocol). OK, I'll try it. Thanks, Chanwoo Choi -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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