[openwrt/openwrt] mediatek: dts: increase mt7986 ATF reserved memory to 256 kiB

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/2958eeea3b474ce932c432dfb2acd4b51aaa5cd7

commit 2958eeea3b474ce932c432dfb2acd4b51aaa5cd7
Author: Shiji Yang <yangshiji66 at outlook.com>
AuthorDate: Sun Aug 10 20:15:12 2025 +0800

    mediatek: dts: increase mt7986 ATF reserved memory to 256 kiB
    
    The latest Mediatek open-source Trusted Firmware-A project has
    reserved 256 KiB for BL2 and BL31.
    
    Link: https://lore.kernel.org/all/OSBPR01MB16701BDF64C43EF07390C830BC29A@OSBPR01MB1670.jpnprd01.prod.outlook.com/
    Signed-off-by: Shiji Yang <yangshiji66 at outlook.com>
    Link: https://github.com/openwrt/openwrt/pull/19741
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 ...ediatek-mt7986-increase-ATF-reserved-memo.patch | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/target/linux/mediatek/patches-6.12/199-arm64-dts-mediatek-mt7986-increase-ATF-reserved-memo.patch b/target/linux/mediatek/patches-6.12/199-arm64-dts-mediatek-mt7986-increase-ATF-reserved-memo.patch
new file mode 100644
index 0000000000..8cef5ba442
--- /dev/null
+++ b/target/linux/mediatek/patches-6.12/199-arm64-dts-mediatek-mt7986-increase-ATF-reserved-memo.patch
@@ -0,0 +1,29 @@
+From 236317dd4e55512933dcdaec3d0b4a0824f5e5bd Mon Sep 17 00:00:00 2001
+From: Shiji Yang <yangshiji66 at outlook.com>
+Date: Sun, 10 Aug 2025 18:11:01 +0800
+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 at outlook.com>
+---
+ arch/arm64/boot/dts/mediatek/mt7986a.dtsi | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
++++ b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
+@@ -76,9 +76,9 @@
+ 			record-size = <0x1000>;
+ 		};
+ 
+-		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
++		/* 256 KiB reserved for ARM Trusted Firmware (BL31 + BL32) */
+ 		secmon_reserved: secmon at 43000000 {
+-			reg = <0 0x43000000 0 0x30000>;
++			reg = <0 0x43000000 0 0x40000>;
+ 			no-map;
+ 		};
+