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sunxi: add Kconfig option for the maximum accessible DRAM

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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>
This commit is contained in:
Icenowy Zheng 2018-10-25 17:23:06 +08:00 • committed by Jagan Teki
parent 7009134c99
commit f8aa3f8d84
1 changed files with 6 additions and 0 deletions
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6
arch/arm/mach-sunxi/Kconfig
View file

@ -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