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@aosc.io --- arch/arm/mach-sunxi/Kconfig | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig index 1fededd0a3..32739e0f33 100644 --- a/arch/arm/mach-sunxi/Kconfig +++ b/arch/arm/mach-sunxi/Kconfig @@ -63,6 +63,13 @@ 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 0x80000000 + choice prompt "Sunxi SoC Variant" optional