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

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Message-ID: <43B123F21A8CFE44A9641C099E4196FFCF8E7CEE@RTITMBSVM04.realtek.com.tw>
Date:   Mon, 23 Sep 2019 02:32:52 +0000
From:   James Tai <james.tai@...ltek.com>
To:     "'Masahiro Yamada'" <yamada.masahiro@...ionext.com>,
        Arnd Bergmann <arnd@...db.de>
CC:     "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

> 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.
> 

OK. I understand.

> --
> Best Regards
> Masahiro Yamada
> 
> ------Please consider the environment before printing this e-mail.