linux-kernel - [PATCH] arm64: dts: mediatek: mt7986: increase ATF reserved memory to 256 kiB

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Message-ID:
 <OSBPR01MB16701BDF64C43EF07390C830BC29A@OSBPR01MB1670.jpnprd01.prod.outlook.com>
Date: Sun, 10 Aug 2025 18:30:49 +0800
From: Shiji Yang <yangshiji66@...look.com>
To: linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Shiji Yang <yangshiji66@...look.com>
Subject: [PATCH] arm64: dts: mediatek: mt7986: increase ATF reserved memory to 256 kiB

The latest Mediatek open-source Trusted Firmware-A project has
reserved 256 KiB for BL2 and BL31. It is better to increase the
reserved memory region in the Linux kernel to protect the data.

Signed-off-by: Shiji Yang <yangshiji66@...look.com>
---

Ref:
https://github.com/mtk-openwrt/arm-trusted-firmware/blob/78a0dfd927bb00ce973a1f8eb4079df0f755887a/plat/mediatek/mt7986/include/platform_def.h#L61-L71

 arch/arm64/boot/dts/mediatek/mt7986a.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
index 559990dcd..d21e0d13f 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
@@ -68,9 +68,9 @@ reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;
 		ranges;
-		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
+		/* 256 KiB reserved for ARM Trusted Firmware (BL31 + BL32) */
 		secmon_reserved: secmon@...00000 {
-			reg = <0 0x43000000 0 0x30000>;
+			reg = <0 0x43000000 0 0x40000>;
 			no-map;
 		};
 
-- 
2.50.0