[PATCH 3/4] board: amlogic: add Khadas VIM4 support

[Lucas Tanure <tanure@linux.com>]

Add initial support for the Khadas VIM4 board (Amlogic A311D2, T7
family): UART console, DRAM (first bank), PSCI reset through BL31 and
the secure monitor. Storage, network and USB support come later.

The image is position independent with TEXT_BASE=0, so the same
u-boot.bin can be chainloaded from the vendor U-Boot for development
or packaged as BL33 into the vendor boot image.

The console runs at 921600 baud, the serial console convention on the
VIM4 (this is also how BL2 configures uart_a).

Assisted-by: Claude:claude-fable-5
Signed-off-by: Lucas Tanure <tanure@linux.com>
---
 .../amlogic-t7-a311d2-khadas-vim4-u-boot.dtsi | 22 +++++++++++++++
 board/amlogic/vim4/MAINTAINERS                |  7 +++++
 board/amlogic/vim4/Makefile                   |  4 +++
 board/amlogic/vim4/vim4.c                     | 14 ++++++++++
 configs/khadas-vim4_defconfig                 | 27 +++++++++++++++++++
 5 files changed, 74 insertions(+)
 create mode 100644 arch/arm/dts/amlogic-t7-a311d2-khadas-vim4-u-boot.dtsi
 create mode 100644 board/amlogic/vim4/MAINTAINERS
 create mode 100644 board/amlogic/vim4/Makefile
 create mode 100644 board/amlogic/vim4/vim4.c
 create mode 100644 configs/khadas-vim4_defconfig

diff --git a/arch/arm/dts/amlogic-t7-a311d2-khadas-vim4-u-boot.dtsi b/arch/arm/dts/amlogic-t7-a311d2-khadas-vim4-u-boot.dtsi
new file mode 100644
index 00000000000..dde2cd804e3
--- /dev/null
+++ b/arch/arm/dts/amlogic-t7-a311d2-khadas-vim4-u-boot.dtsi
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2026 Lucas Tanure <tanure@linux.com>
+ */
+
+/ {
+	chosen {
+		stdout-path = "serial0:921600n8";
+	};
+
+	soc {
+		bootph-all;
+	};
+};
+
+&uart_a {
+	bootph-all;
+};
+
+&xtal {
+	bootph-all;
+};
diff --git a/board/amlogic/vim4/MAINTAINERS b/board/amlogic/vim4/MAINTAINERS
new file mode 100644
index 00000000000..5e1ec98b571
--- /dev/null
+++ b/board/amlogic/vim4/MAINTAINERS
@@ -0,0 +1,7 @@
+VIM4
+M:	Lucas Tanure <tanure@linux.com>
+S:	Maintained
+L:	u-boot-amlogic@groups.io
+F:	board/amlogic/vim4/
+F:	configs/khadas-vim4_defconfig
+F:	arch/arm/dts/amlogic-t7-a311d2-khadas-vim4-u-boot.dtsi
diff --git a/board/amlogic/vim4/Makefile b/board/amlogic/vim4/Makefile
new file mode 100644
index 00000000000..0cc4078c549
--- /dev/null
+++ b/board/amlogic/vim4/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0+
+# (C) Copyright 2026 Lucas Tanure <tanure@linux.com>
+
+obj-y	:= vim4.o
diff --git a/board/amlogic/vim4/vim4.c b/board/amlogic/vim4/vim4.c
new file mode 100644
index 00000000000..5db3deefe0e
--- /dev/null
+++ b/board/amlogic/vim4/vim4.c
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2026 Lucas Tanure <tanure@linux.com>
+ */
+
+#include <init.h>
+#include <asm/arch/eth.h>
+
+int misc_init_r(void)
+{
+	meson_generate_serial_ethaddr();
+
+	return 0;
+}
diff --git a/configs/khadas-vim4_defconfig b/configs/khadas-vim4_defconfig
new file mode 100644
index 00000000000..10a64c07a88
--- /dev/null
+++ b/configs/khadas-vim4_defconfig
@@ -0,0 +1,27 @@
+CONFIG_ARM=y
+CONFIG_POSITION_INDEPENDENT=y
+CONFIG_ARCH_MESON=y
+CONFIG_TEXT_BASE=0x00000000
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_ENV_SIZE=0x2000
+CONFIG_DM_GPIO=y
+CONFIG_DEFAULT_DEVICE_TREE="amlogic/amlogic-t7-a311d2-khadas-vim4"
+CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_MESON_T7=y
+CONFIG_SYS_LOAD_ADDR=0x10000000
+CONFIG_DEBUG_UART_BASE=0xfe078000
+CONFIG_DEBUG_UART_CLOCK=24000000
+CONFIG_IDENT_STRING=" khadas-vim4"
+CONFIG_DEBUG_UART=y
+CONFIG_OF_BOARD_SETUP=y
+# CONFIG_DISPLAY_CPUINFO is not set
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_SYS_PROMPT="kvim4> "
+# CONFIG_CMD_BDI is not set
+# CONFIG_CMD_IMI is not set
+CONFIG_CMD_CACHE=y
+CONFIG_OF_CONTROL=y
+CONFIG_BAUDRATE=921600
+CONFIG_DEBUG_UART_ANNOUNCE=y
+CONFIG_DEBUG_UART_SKIP_INIT=y
+CONFIG_MESON_SERIAL=y
-- 
2.55.0