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

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Date:	Fri, 06 Feb 2015 09:07:10 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Brent Wang <wangbintian@...il.com>,
	Mark Rutland <mark.rutland@....com>
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Subject: Re: [PATCH 3/3] arm64: dts: Add dts files for Hisilicon Hi6220 SoC

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.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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