RE: [PATCH] arm64: dts: exynos: correct GIC CPU interfaces address range on Exynos7

Alim Akhtar
2021-08-05T11:08:51Z

> -----Original Message-----
> From: Marc Zyngier <maz@kernel.org>
> Sent: 05 August 2021 15:31
> To: Alim Akhtar <alim.akhtar@samsung.com>
> Cc: 'Krzysztof Kozlowski' <krzysztof.kozlowski@canonical.com>; 'Rob
Herring'
> <robh+dt@kernel.org>; devicetree@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; linux-samsung-soc@vger.kernel.org; linux-
> kernel@vger.kernel.org; 'Chanwoo Choi' <cw00.choi@samsung.com>;
> 'Pankaj Dubey' <pankaj.dubey@samsung.com>; 'Sam Protsenko'
> <semen.protsenko@linaro.org>
> Subject: Re: [PATCH] arm64: dts: exynos: correct GIC CPU interfaces
address
> range on Exynos7
>
> On Thu, 05 Aug 2021 10:26:14 +0100,
> "Alim Akhtar" <alim.akhtar@samsung.com> wrote:
> >
> > Hi Krzysztof,
> >
> > > -----Original Message-----
> > > From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> > > Sent: 05 August 2021 13:07
> > > To: Rob Herring <robh+dt@kernel.org>; devicetree@vger.kernel.org;
> > > linux- arm-kernel@lists.infradead.org;
> > > linux-samsung-soc@vger.kernel.org; linux- kernel@vger.kernel.org
> > > Cc: Alim Akhtar <alim.akhtar@samsung.com>; Chanwoo Choi
> > > <cw00.choi@samsung.com>; Pankaj Dubey
> <pankaj.dubey@samsung.com>;
> > > Sam Protsenko <semen.protsenko@linaro.org>; Marc Zyngier
> > > <maz@kernel.org>
> > > Subject: Re: [PATCH] arm64: dts: exynos: correct GIC CPU interfaces
> > > address range on Exynos7
> > >
> > > On 05/08/2021 09:21, Krzysztof Kozlowski wrote:
> > > > The GIC-400 CPU interfaces address range is defined as
> > > > 0x2000-0x3FFF (by ARM).
> > > >
> > >
> > Looking at DDI0471B_gic400_r0p1_trm.pdf, CPU interface range is
> > 0x0000 ~ 0x10000
>
> I don't where you are getting this range from. The only 64kB range I'm
aware
> of is the optional integration trick to cope with 64kB pages that was
> documented in the initial SBSA spec. The HW itself only decodes 8kB for
the
> CPU interface.
>
There was a typo in above range, thanks for the clarification. Got it.

> M.
>
> --
> Without deviation from the norm, progress is not possible.