[U-Boot] [RFC PATCH 09/10] sunxi: introduce RMR switch to enter payloads in 64-bit mode

[Simon Glass]

Hi Andre,

On 2 November 2016 at 19:36, Andre Przywara <andre.przywara at arm.com> wrote:
> The ARMv8 capable Allwinner A64 SoC comes out of reset in AArch32 mode.
> To run AArch64 code, we have to trigger a warm reset via the RMR register,
> which proceeds with code execution at the address stored in the RVBAR
> register.
> If the bootable payload in the FIT image is using a different
> architecture than the SPL has been compiled for, enter it via this said
> RMR switch mechanism, by writing the entry point address into the MMIO
> mapped, writable version of the RVBAR register.
> Then the warm reset is triggered via a system register write.
> If the payload architecture is the same as the SPL, we use the normal
> branch as usual.
>
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
>  arch/arm/lib/spl.c               | 14 ++++++++++

I think the changes to this file should go in a separate patch as they
are generic to ARM.

>  arch/arm/mach-sunxi/Makefile     |  1 +
>  arch/arm/mach-sunxi/spl_switch.c | 60 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 75 insertions(+)
>  create mode 100644 arch/arm/mach-sunxi/spl_switch.c
[...]

Regards,
Simon