linux-kernel - Re: [PATCH 3/3] arm64: dts: Add dts files for Hisilicon Hi6220 SoC

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Message-ID: <CAAS=xmgNMgm6NFVUs5p+TNrf4MHiCsjzR1eSK84o5o5MApGOkw@mail.gmail.com>
Date:	Mon, 9 Feb 2015 11:26:55 +0800
From:	Brent Wang <wangbintian@...il.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Mark Rutland <mark.rutland@....com>,
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Subject: Re: [PATCH 3/3] arm64: dts: Add dts files for Hisilicon Hi6220 SoC

Hello Marc,

2015-02-06 17:07 GMT+08:00 Marc Zyngier <marc.zyngier@....com>:
> On 06/02/15 08:42, Brent Wang wrote:
>
> [...]
>
>>>
>>>> +                   <0x0 0xf6802000 0x0 0x2000>, /* GICC */
>>>> +                   <0x0 0xf6804000 0x0 0x2000>, /* GICH */
>>>> +                   <0x0 0xf6806000 0x0 0x2000>; /* GICV */
>>>
>>> I guess no-one's bothered to consider 64k pages?
>>>
>>> Given GICH and GICV, I hope that this platform is booted at EL2?
>> Transfer from EL3 to EL1 directly, keep these two just for future use.
>
> That's a real shame, as it keeps users away from some key aspects of the
> ARMv8 architecture.
>
>>>
>>>> +             #interrupt-cells = <3>;
>>>> +             #address-cells = <0>;
>>>> +             interrupt-controller;
>
> And if you're keeping GICH/GICV, where is the maintenance interrupt?
>
>>>> +     };
>>>> +
>>>> +
>>>> +     timer {
>>>> +             compatible = "arm,armv8-timer";
>>>> +             interrupt-parent = <&gic>;
>>>> +             interrupts = <1 13 0xff08>,
>>>> +                          <1 14 0xff08>,
>>>> +                          <1 11 0xff08>,
>>>> +                          <1 10 0xff08>;
>>>> +             clock-frequency = <1200000>;
>>>> +     };
>>>
>>> NAK. Fix your firmware to configure CNTFRQ, on all CPUs.
>> Fix in next version, maybe it will take some time to change firmware.
>
> While you're at it, make sure CNTVOFF_EL2 is set to zero on all CPUs
> before dropping to EL1. This tends to be overlooked.
Thank you for reminding me, I will keep that in mind.

Thanks,

>
> Thanks,
>
>         M.
> --
> Jazz is not dead. It just smells funny...

-- 
Best Regards,

Bintian
===========================
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