linux-kernel - Re: [PATCH] ARM: Add support for Realtek SOC

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Date:   Wed, 11 Sep 2019 17:34:48 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     James Tai[戴志峰] <james.tai@...ltek.com>,
        "jamestai.sky@...il.com" <jamestai.sky@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paul Burton <paul.burton@...s.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Doug Anderson <armlinux@...isordat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Stefan Agner <stefan@...er.ch>,
        Nicolas Pitre <nico@...xnic.net>,
        Thierry Reding <treding@...dia.com>,
        "Jason A . Donenfeld" <Jason@...c4.com>,
        Rob Herring <robh@...nel.org>,
        CY_Huang[黃鉦晏] <cy.huang@...ltek.com>,
        Phinex Hung <phinex@...ltek.com>,
        Andreas Färber <afaerber@...e.de>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>
Subject: Re: [PATCH] ARM: Add support for Realtek SOC

On Wed, Sep 11, 2019 at 5:17 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Wed, Sep 11, 2019 at 9:46 AM James Tai[戴志峰] <james.tai@...ltek.com> wrote:
> > > Subject: Re: [PATCH] ARM: Add support for Realtek SOC
>
> > > > @@ -148,6 +148,7 @@ endif
> > > >  textofs-$(CONFIG_ARCH_MSM8X60) := 0x00208000
> > > >  textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000
> > > >  textofs-$(CONFIG_ARCH_MESON) := 0x00208000
> > > > +textofs-$(CONFIG_ARCH_REALTEK) := 0x00208000
> > > >  textofs-$(CONFIG_ARCH_AXXIA) := 0x00308000
> > >
> > > Can you explain why this is needed for your platform?
> > >
> > We need to reserve memory (0x00000000 ~ 0x001B0000) for rom and boot code.
>
> Ok.


I do not like this much.

This platform is ARCH_MULTI_V7.

ARM_PATCH_PHYS_VIRT allows you to place the kernel image
anywhere in memory as long as the base is aligned at 16MB.

The minimum 'textofs-y := 0x0008000' + extra 16MB offset
will create a space (0x00000000 ~ 0x01008000).

This is more than needed, but it is not a big deal
to waste some megabytes of memory.


-- 
Best Regards
Masahiro Yamada