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[83.8.201.110]) by smtp.gmail.com with ESMTPSA id p4-20020a05640243c400b00560c6ff443esm1058750edc.66.2024.02.17.10.22.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Feb 2024 10:22:43 -0800 (PST) From: Artur Weber Date: Sat, 17 Feb 2024 19:22:40 +0100 Subject: [PATCH] ARM: dts: exynos4412-*: decrease memory to account for unusable region Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240217-exynos4-memsize-fix-v1-1-7858e9c5f844@gmail.com> X-B4-Tracking: v=1; b=H4sIAG/50GUC/x2MSwqAMBDFriKzdkCLH/Qq4kLbp87CKh0QP3h3i 8sEkocUQaDUJg8FHKKy+Qh5mpBdBj+DxUUmk5kiM3nNOC+/acErVpUbPMnJzlo3Nhjr0lUUyz0 g6v/a9e/7AfbELrllAAAA To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alim Akhtar Cc: Henrik Grimler , =?utf-8?q?Martin_J=C3=BCcker?= , Jack Knightly , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, replicant@osuosl.org, Artur Weber X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1708194162; l=3075; i=aweber.kernel@gmail.com; s=20231030; h=from:subject:message-id; bh=8oifpfarV9J6Wvv+SArdQLyLIPIXjJtvpilJDp3o5xY=; b=1fLMVp+k6r+NLxpjwtkrkl5xzZEBvgwcASiLsLI04vAxZIDYv6RqkfRVLBWBFQDbaxpvTZw9P OdR5+rinfu0DgUKACC2D5z46VIwXk2ph+yL1jjbWGUtfdQubndboTyS X-Developer-Key: i=aweber.kernel@gmail.com; a=ed25519; pk=RhDBfWbJEHqDibXbhNEBAnc9FMkyznGxX/hwfhL8bv8= The last 4 MiB of RAM on those devices is likely used by trustzone firmware, and is unusable under Linux. Change the device tree memory node accordingly. The proprietary bootloader (S-BOOT) passes these memory ranges through ATAG_MEM; this change allows us to have the correct memory ranges without relying on ATAG_MEM. Tested-by: Henrik Grimler # i9300, i9305 Signed-off-by: Artur Weber --- This follows a similar fix implemented for the exynos5420-based Galaxy Tab boards: https://lore.kernel.org/all/20240130-galaxy-tab-s-cleanup-v1-3-d4e17857241d@grimler.se/ ...which in turn is inspired by another fix applied to exynos5422 Odroid devices, 6591a02e17e6 ("ARM: dts: reduce total RAM by 22 MiB for exynos5422-odroidxu3"): https://lore.kernel.org/all/1421842972-25807-1-git-send-email-m.szyprowski@samsung.com/ --- arch/arm/boot/dts/samsung/exynos4412-i9300.dts | 2 +- arch/arm/boot/dts/samsung/exynos4412-i9305.dts | 2 +- arch/arm/boot/dts/samsung/exynos4412-n710x.dts | 2 +- arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) --- base-commit: 0f1dd5e91e2ba3990143645faff2bcce2d99778e change-id: 20240217-exynos4-memsize-fix-dccdb9eb75d6 Best regards, diff --git a/arch/arm/boot/dts/samsung/exynos4412-i9300.dts b/arch/arm/boot/dts/samsung/exynos4412-i9300.dts index 61aca5798f38..b79d456e976d 100644 --- a/arch/arm/boot/dts/samsung/exynos4412-i9300.dts +++ b/arch/arm/boot/dts/samsung/exynos4412-i9300.dts @@ -18,7 +18,7 @@ / { memory@40000000 { device_type = "memory"; - reg = <0x40000000 0x40000000>; + reg = <0x40000000 0x3fc00000>; }; }; diff --git a/arch/arm/boot/dts/samsung/exynos4412-i9305.dts b/arch/arm/boot/dts/samsung/exynos4412-i9305.dts index 77083f1a8273..1048ef5d9bc3 100644 --- a/arch/arm/boot/dts/samsung/exynos4412-i9305.dts +++ b/arch/arm/boot/dts/samsung/exynos4412-i9305.dts @@ -11,7 +11,7 @@ / { memory@40000000 { device_type = "memory"; - reg = <0x40000000 0x80000000>; + reg = <0x40000000 0x7fc00000>; }; }; diff --git a/arch/arm/boot/dts/samsung/exynos4412-n710x.dts b/arch/arm/boot/dts/samsung/exynos4412-n710x.dts index 0a151437fc73..eee1000dea92 100644 --- a/arch/arm/boot/dts/samsung/exynos4412-n710x.dts +++ b/arch/arm/boot/dts/samsung/exynos4412-n710x.dts @@ -9,7 +9,7 @@ / { memory@40000000 { device_type = "memory"; - reg = <0x40000000 0x80000000>; + reg = <0x40000000 0x7fc00000>; }; /* bootargs are passed in by bootloader */ diff --git a/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi b/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi index 0b89d5682f85..95fc63295860 100644 --- a/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi +++ b/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi @@ -23,7 +23,7 @@ / { memory@40000000 { device_type = "memory"; - reg = <0x40000000 0x80000000>; + reg = <0x40000000 0x7fc00000>; }; aliases {