sunxi: add Kconfig option for the maximum accessible DRAM

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>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>

diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 764337c6435f3df683a3264b0ca303714cb325af..6277abc3ccbecc78695fec1059412211d5c356f9 100644 (file)
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -140,6 +140,12 @@ 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 || MACH_SUN50I_H5 || MACH_SUN50I_H6
+       default 0x80000000
+
 choice
        prompt "Sunxi SoC Variant"
        optional