Add support for Versal Net APU (Cortex a78 processor)

arch/arm64/core/Kconfig

@@ -72,6 +72,13 @@ config CPU_CORTEX_A76_A55
 	help
 	  This option signifies the use of a Cortex-A76 and A55 big little CPU cluster
 
+config CPU_CORTEX_A78
+	bool
+	select CPU_CORTEX_A
+	select ARMV8_A
+	help
+	  This option signifies the use of a Cortex-A78 CPU
+
 config CPU_CORTEX_R82
 	bool
 	select CPU_AARCH64_CORTEX_R

boards/amd/versalnet_apu/CMakeLists.txt

@@ -0,0 +1,19 @@
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2025 Advanced Micro Devices, Inc.
+#
+
+find_package(Dtc 1.4.6 REQUIRED)
+
+# Check if the board-specific qemu.dts file exists
+if(EXISTS "${BOARD_DIR}/${BOARD}-qemu.dts")
+  # Ensure DTC executable is available
+  if(DTC_FOUND)
+    set_property(GLOBAL APPEND PROPERTY extra_post_build_commands
+      COMMAND ${DTC} -I dts -O dtb -q "${BOARD_DIR}/${BOARD}-qemu.dts" -o "${PROJECT_BINARY_DIR}/${BOARD}-qemu.dtb"
+    )
+  else()
+    message(FATAL_ERROR "DTC not found, but required for compiling ${BOARD}-qemu.dts")
+  endif()
+endif()

boards/amd/versalnet_apu/Kconfig.versalnet_apu

@@ -0,0 +1,8 @@
+#
+# Copyright (c) 2025 Advanced Micro Devices, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+config BOARD_VERSALNET_APU
+	select SOC_AMD_VERSALNET_APU

boards/amd/versalnet_apu/board.cmake

@@ -0,0 +1,22 @@
+#
+# Copyright (c) 2025 Advanced Micro Devices, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+include(${ZEPHYR_BASE}/boards/common/xsdb.board.cmake)
+set(SUPPORTED_EMU_PLATFORMS qemu)
+set(QEMU_ARCH xilinx-aarch64)
+set(QEMU_CPU_TYPE_${ARCH} cortexa78)
+
+set(QEMU_FLAGS_${ARCH}
+	-machine arm-generic-fdt
+	-hw-dtb ${PROJECT_BINARY_DIR}/${BOARD}-qemu.dtb
+	-device loader,addr=0xEC200300,data=0x3EE,data-len=4 -device loader,addr=0xEC200300,data=0x3DD,data-len=4
+	-nographic
+	-m 2g
+)
+
+set(QEMU_KERNEL_OPTION
+	-device loader,cpu-num=0,file=\$<TARGET_FILE:\${logical_target_for_zephyr_elf}>
+)

boards/amd/versalnet_apu/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: versalnet_apu
+  vendor: amd
+  socs:
+  - name: amd_versalnet_apu

boards/amd/versalnet_apu/doc/index.rst

@@ -0,0 +1,74 @@
+.. zephyr:board:: versalnet_apu
+
+Overview
+********
+This configuration provides support for the APU(A78), ARM processing unit on AMD
+Versal Net SOC, it can operate as following:
+
+* Four independent A78 clusters each having 4 A78 cores
+
+This processing unit is based on an ARM Cortex-A78 CPU, it also enables the following devices:
+
+* ARM GIC v3 Interrupt Controller
+* Global Timer Counter
+* SBSA UART
+
+Hardware
+********
+Supported Features
+==================
+
+.. zephyr:board-supported-hw::
+
+Devices
+=======
+System Timer
+------------
+
+This board configuration uses a system timer tick frequency of 100 MHz.
+
+Serial Port
+-----------
+
+This board configuration uses a single serial communication channel with the
+on-chip UART0.
+
+Memories
+--------
+
+Although Flash, DDR and OCM memory regions are defined in the DTS file,
+all the code plus data of the application will be loaded in the sram0 region,
+which points to the DDR memory. The ocm0 memory area is currently available
+for usage, although nothing is placed there by default.
+
+Known Problems or Limitations
+=============================
+
+The following platform features are unsupported:
+
+* Only the first cpu in the first cluster of the A78 subsystem is supported.
+
+Programming and Debugging
+*************************
+
+.. zephyr:board-supported-runners::
+
+Build and flash in the usual way. Here is an example for the :zephyr:code-sample:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: versalnet_apu
+   :goals: build flash
+
+You should see the following message on the console:
+
+.. code-block:: console
+
+   Hello World! versalnet_apu/amd_versalnet_apu
+
+
+References
+**********
+
+1. ARMv8‑A Architecture Reference Manual (ARM DDI 0487)
+2. Arm Cortex‑A78 Core Technical Reference Manual (Doc ID 101430)

boards/amd/versalnet_apu/support/xsdb.cfg

@@ -0,0 +1,28 @@
+# Copyright (c) 2025 Advanced Micro Devices, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+proc load_image args  {
+	set elf_file [lindex $args 0]
+	set pdi_file [lindex $args 1]
+	set bl31_file [lindex $args 2]
+
+	if { [info exists ::env(HW_SERVER_URL)] } {
+		connect -url $::env(HW_SERVER_URL)
+	} else {
+		connect
+	}
+
+	device program $pdi_file
+	targets -set -nocase -filter {name =~ "Versal*"}
+	after 100
+	targets -set -filter {name =~ "Cortex-A78AE*0.0"}
+	rst -proc
+	after 100
+	dow -force $elf_file
+	dow -force $bl31_file
+	con
+	exit
+}
+
+load_image {*}$argv