[PATCH] arm: socfpga: agilex: restore Multi-DTB support for NAND boot

[dinesh.maniyam at altera.com]

From: Dinesh Maniyam <dinesh.maniyam at altera.com>

>From v2025.10 onward, Agilex platforms use the upstream Linux device
tree sources instead of local copies.
To continue using a single defconfig while supporting NAND boot,
restore Multi-DTB support and update the DT paths to the upstream
intel directory.

NAND boot is configured to use FDT-1, while other boot flows
continue to use the default device tree.
No functional change is intended for non-NAND boot paths.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam at altera.com>
---
 arch/arm/dts/socfpga_agilex_socdk-u-boot.dtsi | 38 +++++++++++++++++++
 configs/socfpga_agilex_defconfig              |  2 +-
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/arch/arm/dts/socfpga_agilex_socdk-u-boot.dtsi b/arch/arm/dts/socfpga_agilex_socdk-u-boot.dtsi
index 6f2fe7bf746..37a3b14ed33 100644
--- a/arch/arm/dts/socfpga_agilex_socdk-u-boot.dtsi
+++ b/arch/arm/dts/socfpga_agilex_socdk-u-boot.dtsi
@@ -181,3 +181,41 @@
 		};
 	};
 };
+
+#if !defined(CONFIG_SOCFPGA_SECURE_VAB_AUTH)
+&fdt_0_blob {
+	filename = "dts/upstream/src/arm64/intel/socfpga_agilex_socdk.dtb";
+};
+
+&images {
+	fdt-1 {
+		description = "socfpga_socdk_nand";
+		type = "flat_dt";
+		compression = "none";
+		fdt_1_blob: blob-ext {
+			filename = "dts/upstream/src/arm64/intel/socfpga_agilex_socdk_nand.dtb";
+		};
+		hash {
+			algo = "crc32";
+		};
+	};
+};
+
+&board_config {
+	board-1 {
+		description = "board_1";
+		firmware = "atf";
+		loadables = "uboot";
+		fdt = "fdt-1";
+		signature {
+			algo = "crc32";
+			key-name-hint = "dev";
+			sign-images = "atf", "uboot", "fdt-1";
+		};
+	};
+};
+
+&binman {
+	/delete-node/ kernel;
+};
+#endif
diff --git a/configs/socfpga_agilex_defconfig b/configs/socfpga_agilex_defconfig
index eb99392f0ea..b2c7b30d546 100644
--- a/configs/socfpga_agilex_defconfig
+++ b/configs/socfpga_agilex_defconfig
@@ -58,7 +58,7 @@ CONFIG_CMD_CACHE=y
 CONFIG_CMD_SMC=y
 CONFIG_CMD_UBI=y
 CONFIG_OF_UPSTREAM=y
-CONFIG_OF_LIST=""
+CONFIG_OF_LIST="intel/socfpga_agilex_socdk intel/socfpga_agilex_socdk_nand"
 CONFIG_ENV_IS_IN_FAT=y
 CONFIG_ENV_IS_IN_UBI=y
 CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"
-- 
2.43.7