[U-Boot] [PATCH v2 5/6] sunxi: add Kconfig option for the maximum accessible DRAM

[André Przywara]

On 10/25/18 10:23 AM, Icenowy Zheng wrote:
> Allwinner 64-bit SoCs can use 4GiB DRAM chip, however their memory map
> has only allocated 3GiB for DRAM, so only 3GiB of the DRAM is
> accessible.
> 
> Add a Kconfig option for the maximum accessible DRAM.
> 
> For A80 it should be a much higher value (8GiB), but as I have no A80
> device to test and originally U-Boot only supports 2GiB DRAM on A80, it
> currently still falls under the 2GiB situation.
> 
> Signed-off-by: Icenowy Zheng <icenowy at aosc.io>

Reviewed-by: Andre Przywara <andre.przywara at arm.com>

Cheers,
Andre.

> ---
> This used to be in another patchset targeting 3GiB support.
> 
> Changes in v2:
> - Add H6 to SoCs that support 3GiB DRAM.
> 
>  arch/arm/mach-sunxi/Kconfig | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
> index 764337c643..e9e1b4bc0e 100644
> --- a/arch/arm/mach-sunxi/Kconfig
> +++ b/arch/arm/mach-sunxi/Kconfig
> @@ -140,6 +140,14 @@ config MACH_SUNXI_H3_H5
>  	select SUNXI_GEN_SUN6I
>  	select SUPPORT_SPL
>  
> +# TODO: try out A80's 8GiB DRAM space
> +config SUNXI_DRAM_MAX_SIZE
> +	hex
> +	default 0xC0000000 if MACH_SUN50I
> +	default 0xC0000000 if MACH_SUN50I_H5
> +	default 0xC0000000 if MACH_SUN50I_H6
> +	default 0x80000000
> +
>  choice
>  	prompt "Sunxi SoC Variant"
>  	optional
>