sunxi: Kconfig: introduce SUNXI_MINIMUM_DRAM_MB

Traditionally we assumed that every Allwinner board would come with at
least 256 MB of DRAM, and set our DRAM layout accordingly. This affected
both the default load addresses, but also U-Boot's own address
expectations (like being loaded at 160 MB).

Some SoCs come with co-packaged DRAM, but only provide 32 or 64MB. So
far we special-cased those *chips*, as there was only one chip per DRAM
size. However new chips force us to take a more general approach.

Introduce a Kconfig symbol, which provides the minimum DRAM size of the
board. If nothing else is specified, we use 256 MB, and default to
smaller values for those co-packaged SoCs.
Then select the different DRAM maps according to this new symbol, so
that different SoCs with the same DRAM size can share those definitions.

Inspired by an idea from Icenowy.

This is just refactoring: compiled for all boards before and after this
patch: the binaries were identical.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/Kconfig b/Kconfig
index 2ea735d38e..d297513bac 100644
--- a/Kconfig
+++ b/Kconfig
@@ -312,9 +312,9 @@ config SYS_MALLOC_LEN
 	default 0x4000000 if SANDBOX
 	default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
 	default 0x200000 if ARCH_BMIPS || X86
-	default 0x120000 if MACH_SUNIV
-	default 0x220000 if MACH_SUN8I_V3S
-	default 0x4020000 if ARCH_SUNXI
+	default 0x4020000 if SUNXI_MINIMUM_DRAM_MB >= 256
+	default 0x220000 if SUNXI_MINIMUM_DRAM_MB >= 64
+	default 0x120000 if SUNXI_MINIMUM_DRAM_MB >= 32
 	default 0x400000
 	help
 	  This defines memory to be allocated for Dynamic allocation