[U-Boot] [U-Boot, v4, 03/66] rockchip: back-to-bootrom: add 'back-to-bootrom' support for AArch64

[Philipp Tomsich]

> The back-to-bootrom support for Rockchip is equivalent to an
> (assembly) implementation of setjmp/longjmp (i.e. it saves the
> stack-pointer, link-register and callee-saved registers). Up until
> now, this had only been implemented for AArch32 (i.e. ARMv7 or older),
> which puts the new ARMv8 devices (which boot in AArch64 mode) at a
> slight disadvantage.
> 
> To allow use of the 'back-to-bootrom' feature on new devices (e.g. the
> RK3368), this commit adds an implementation for AArch64.
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> 
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Tom Rini <trini at konsulko.com>
> ---
> 
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
> 
>  arch/arm/mach-rockchip/save_boot_param.S | 37 ++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 

Applied to u-boot-rockchip, thanks!