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[85.4.92.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4601f2dcad5sm25132882f8f.5.2026.06.05.00.10.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jun 2026 00:10:04 -0700 (PDT) From: Alexander Sverdlin To: linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Cc: Alexander Sverdlin , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Hans de Goede , Dmitry Torokhov , Andre Przywara , Jun Yan , Lukas Schmid , =?UTF-8?q?J=2E=20Neusch=C3=A4fer?= , Eric Biggers , Michal Simek , Luca Weiss , Sven Peter , Maxime Ripard , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org Subject: [PATCH v4 6/7] arm64: dts: allwinner: a100: reserve RAM for ATF Date: Fri, 5 Jun 2026 09:09:20 +0200 Message-ID: <20260605070923.3045073-7-alexander.sverdlin@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260605070923.3045073-1-alexander.sverdlin@gmail.com> References: <20260605070923.3045073-1-alexander.sverdlin@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add reserved-memory node carving out Trusted Firmware-A region spanning fixed 256K from physical address 0x40000000. Even though Allwinner ATF itself passes the address range in the fdt to U-Boot, U-Boot currently only reserves this memory internally, but doesn't carve out the region in the fdt passed to Linux. Signed-off-by: Alexander Sverdlin --- Changelog: v4: - new patch arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi index 7cb06b19b5a5..d8391663fd1d 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi @@ -87,6 +87,22 @@ osc32k: osc32k-clk { #clock-cells = <0>; }; + reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + + /* + * 256 KiB reserved for Trusted Firmware-A (BL31). + * This is added by BL31 itself, but some bootloaders fail + * to propagate this into the DTB handed to kernels. + */ + secmon@40000000 { + reg = <0x0 0x40000000 0x0 0x40000>; + no-map; + }; + }; + timer { compatible = "arm,armv8-timer"; interrupts =