linux-kernel - Re: [PATCH v5 09/10] ARM: sunplus: Add initial support for Sunplus SP7021 SoC

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Message-ID: <CAK8P3a1-4XnrkWc_0SPns9xj9Yp4xWhEahLOkeafXmAYWfbYJA@mail.gmail.com>
Date:   Tue, 7 Dec 2021 10:11:45 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     qinjian[覃健] <qinjian@...lus1.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Mark Brown <broonie@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>
Subject: Re: [PATCH v5 09/10] ARM: sunplus: Add initial support for Sunplus
 SP7021 SoC

On Tue, Dec 7, 2021 at 8:21 AM qinjian[覃健] <qinjian@...lus1.com> wrote:
> > > @@ -152,6 +152,7 @@ textofs-$(CONFIG_ARCH_MSM8X60) := 0x00208000
> > >  textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000
> > >  textofs-$(CONFIG_ARCH_MESON) := 0x00208000
> > >  textofs-$(CONFIG_ARCH_AXXIA) := 0x00308000
> > > +textofs-$(CONFIG_ARCH_SUNPLUS) := 0x00308000
> >
> > What is this needed for? If it boots without this line, better avoid
> > adding it, because
> > it will increase the kernel size for everyone else (unless they also enable
> > AXXIA).
> >
>
> SP7021 reserved the 1st 1MB memory for ARM926@...hip using,
> The 2nd 1MB memory for IOP device and the 3rd 1MB memory for bootloader.
> I'll add these comments at next commit.

I think you can just remove the memory from the system memory map in the
device tree and pretend it only starts after the bootloader. It's been a while
since I looked at this though, so I could be misremembering what the minimum
boundaries are for doing this.

        Arnd