From 62e6278d1e7e6628a9ea8b4429a99247fc6a6be6 Mon Sep 17 00:00:00 2001 From: Ley Foon Tan Date: Fri, 22 Mar 2019 01:24:03 +0800 Subject: [PATCH] arm: dts: Stratix10: Modify stratix10 socdk memory node The stratix10 socdk ships with 4GB of memory. Modify the device tree to represent this. Note that to access 4GB of memory in Stratix 10, due to the IO space from 2GB to 4GB, we use the fact that the DDR controller ignores upper address bits outside of the configured DRAM's size. This means that , the 4GB DRAM is mapped to memory every 4GB. For an 8GB memory, you can either live with the 2GB IO space, and loose access to that memory from the processor, or use the same trick: Loose 2GB of memory: memory { device_type = "memory"; /* 8GB */ /* first 2GB */ reg = <0 0x00000000 0 0x80000000>, /* last 4GB */ <1 0x00000000 1 0x00000000>; u-boot,dm-pre-reloc; }; or to map it all: memory { device_type = "memory"; /* 8GB */ /* first 2GB */ reg = <0 0x00000000 0 0x80000000>, /* next 6GB */ <2 0x80000000 1 0x80000000>; u-boot,dm-pre-reloc; }; Signed-off-by: Dalon Westergreen Signed-off-by: Ley Foon Tan --- arch/arm/dts/socfpga_stratix10_socdk.dts | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/dts/socfpga_stratix10_socdk.dts b/arch/arm/dts/socfpga_stratix10_socdk.dts index 6e8ddcd..c59b77d 100644 --- a/arch/arm/dts/socfpga_stratix10_socdk.dts +++ b/arch/arm/dts/socfpga_stratix10_socdk.dts @@ -36,7 +36,9 @@ memory { device_type = "memory"; - reg = <0 0 0 0x80000000>; /* 2GB */ + /* 4GB */ + reg = <0 0x00000000 0 0x80000000>, + <1 0x80000000 0 0x80000000>; u-boot,dm-pre-reloc; }; }; -- 2.7.4