linux-kernel - Re: [PATCH v2 11/12] riscv: Add the Allwinner SoC family Kconfig option

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Message-ID: <4413987.e9J7NaK4W3@diego>
Date:   Mon, 28 Nov 2022 22:05:08 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Conor Dooley <conor@...nel.org>, Guo Ren <guoren@...nel.org>
Cc:     Samuel Holland <samuel@...lland.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-sunxi@...ts.linux.dev, Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andre Przywara <andre.przywara@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <apatel@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        Christian Hewitt <christianshewitt@...il.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Stanislav Jakubek <stano.jakubek@...il.com>
Subject: Re: [PATCH v2 11/12] riscv: Add the Allwinner SoC family Kconfig option

Am Sonntag, 27. November 2022, 12:31:15 CET schrieb Guo Ren:
> On Sun, Nov 27, 2022 at 12:36 AM Conor Dooley <conor@...nel.org> wrote:
> >
> > On Fri, Nov 25, 2022 at 05:46:55PM -0600, Samuel Holland wrote:
> > > Allwinner manufactures the sunxi family of application processors. This
> > > includes the "sun8i" series of ARMv7 SoCs, the "sun50i" series of ARMv8
> > > SoCs, and now the "sun20i" series of 64-bit RISC-V SoCs.
> > >
> > > The first SoC in the sun20i series is D1, containing a single T-HEAD
> > > C906 core. D1s is a low-pin-count variant of D1 with co-packaged DRAM.
> > >
> > > Most peripherals are shared across the entire chip family. In fact, the
> > > ARMv7 T113 SoC is pin-compatible and almost entirely register-compatible
> > > with the D1s.
> > >
> > > This means many existing device drivers can be reused. To facilitate
> > > this reuse, name the symbol ARCH_SUNXI, since that is what the existing
> > > drivers have as their dependency.
> > >
> > > Reviewed-by: Heiko Stuebner <heiko@...ech.de>
> > > Tested-by: Heiko Stuebner <heiko@...ech.de>
> > > Signed-off-by: Samuel Holland <samuel@...lland.org>
> > > ---
> > >
> > > Changes in v2:
> > >  - Sort Kconfig as if we had done s/SOC_/ARCH_/ for future-proofing
> > >
> > >  arch/riscv/Kconfig.socs | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > >
> > > diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
> > > index 69774bb362d6..4c1dc2ca11f9 100644
> > > --- a/arch/riscv/Kconfig.socs
> > > +++ b/arch/riscv/Kconfig.socs
> > > @@ -26,6 +26,15 @@ config SOC_STARFIVE
> > >       help
> > >         This enables support for StarFive SoC platform hardware.
> > >
> > > +config ARCH_SUNXI
> > > +     bool "Allwinner sun20i SoCs"
> > > +     select ERRATA_THEAD if MMU && !XIP_KERNEL
> 
> depend on MMU
> depend on !XIP_KERNEL
> select ERRATA_THEAD

That sounds like a better variant.

The D1 / C906 _needs_ the errata for the memory handling
and the other alternative constraints require the !XIP

With the select, a xip-kernel would not boot at all on a D1


Heiko