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

[Arnd Bergmann]

On Tue, Dec 7, 2021 at 8:21 AM qinjian[覃健] <qinjian@xxxxxxxxxxx> 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@P-Chip 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