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commit 512dee830998ad6f502785910962905862f91f24
Author: raiden00pl <[email protected]>
AuthorDate: Mon Oct 19 14:46:50 2026 +0200

    boards/stm32g4: add nucleo-g491re board support
    
    Nucleo-64 board with the STM32G491RE, pin compatible with the
    Nucleo-G474RE. nsh configuration with the console on LPUART1, the
    ST-LINK virtual COM port.
    
    Signed-off-by: raiden00pl <[email protected]>
    Assisted-by: Claude Code
---
 .../arm/stm32g4/boards/nucleo-g491re/index.rst     |  35 ++++
 boards/Kconfig                                     |  12 ++
 boards/arm/stm32g4/nucleo-g491re/CMakeLists.txt    |  23 +++
 boards/arm/stm32g4/nucleo-g491re/Kconfig           |   7 +
 .../stm32g4/nucleo-g491re/configs/nsh/defconfig    |  36 ++++
 boards/arm/stm32g4/nucleo-g491re/include/board.h   | 182 +++++++++++++++++++++
 boards/arm/stm32g4/nucleo-g491re/scripts/Make.defs |  47 ++++++
 boards/arm/stm32g4/nucleo-g491re/scripts/ld.script | 138 ++++++++++++++++
 .../arm/stm32g4/nucleo-g491re/src/CMakeLists.txt   |  37 +++++
 boards/arm/stm32g4/nucleo-g491re/src/Make.defs     |  41 +++++
 .../arm/stm32g4/nucleo-g491re/src/nucleo-g491re.h  |  62 +++++++
 .../arm/stm32g4/nucleo-g491re/src/stm32_autoleds.c |  58 +++++++
 boards/arm/stm32g4/nucleo-g491re/src/stm32_boot.c  |  49 ++++++
 .../arm/stm32g4/nucleo-g491re/src/stm32_bringup.c  |  66 ++++++++
 .../arm/stm32g4/nucleo-g491re/src/stm32_buttons.c  |  62 +++++++
 .../arm/stm32g4/nucleo-g491re/src/stm32_userleds.c |  56 +++++++
 16 files changed, 911 insertions(+)

diff --git a/Documentation/platforms/arm/stm32g4/boards/nucleo-g491re/index.rst 
b/Documentation/platforms/arm/stm32g4/boards/nucleo-g491re/index.rst
new file mode 100644
index 00000000000..330b56824fa
--- /dev/null
+++ b/Documentation/platforms/arm/stm32g4/boards/nucleo-g491re/index.rst
@@ -0,0 +1,35 @@
+================
+ST Nucleo G491RE
+================
+
+.. tags:: arch:arm, chip:stm32g4, part:stm32g491, vendor:st
+
+Nucleo-64 board with the STM32G491RE MCU:
+
+  https://www.st.com/en/evaluation-tools/nucleo-g491re.html
+
+The STM32G491 is the category 4 member of the family: compared to the
+STM32G474 it has no HRTIM, ADC4/5, DAC2/4, COMP5-7, OPAMP4/5, I2C4, SPI4,
+FDCAN3, TIM5, FMC or QUADSPI, 112 KB of SRAM (80 + 16 KB plus 16 KB CCM)
+and a single bank 512 KB flash with 2 KB pages. The board is otherwise
+pin compatible with the Nucleo-G474RE.
+
+Clocking
+========
+
+SYSCLK is 170 MHz from the PLL fed by the 16 MHz HSI. HSE and LSE are not
+installed.
+
+Serial Console
+==============
+
+LPUART1 on PA2/PA3 is connected to the ST-LINK virtual COM port and is the
+default console. USART3 on PC10/PC11 is available on CN7 pins 1 and 2.
+
+Configurations
+==============
+
+nsh
+---
+
+NSH on the ST-LINK virtual COM port.
diff --git a/boards/Kconfig b/boards/Kconfig
index 04e9f317ec7..0f180dfb868 100644
--- a/boards/Kconfig
+++ b/boards/Kconfig
@@ -3535,6 +3535,17 @@ config ARCH_BOARD_NUCLEO_G474RE
                STMicro Nucleo-G474RE board based on the STMicro STM32G474RET6
                MCU, a Cortex-M4 with FPU, 170 MHz, 128 KB SRAM, 512 KB code.
 
+config ARCH_BOARD_NUCLEO_G491RE
+       bool "ST Micro Nucleo G491RE"
+       depends on ARCH_CHIP_STM32G491R
+       select ARCH_HAVE_LEDS
+       select ARCH_HAVE_BUTTONS
+       select ARCH_HAVE_IRQBUTTONS
+       select ARCH_BOARD_COMMON
+       ---help---
+               STMicro Nucleo-G491RE board based on the STMicro STM32G491RET6
+               MCU, a Cortex-M4 with FPU, 170 MHz, 112 KB SRAM, 512 KB code.
+
 config ARCH_BOARD_B_L072Z_LRWAN1
        bool "B-L072Z-LRWAN1"
        depends on ARCH_CHIP_STM32L072CZ
@@ -4492,6 +4503,7 @@ config ARCH_BOARD
        default "nucleo-g431kb"                if ARCH_BOARD_NUCLEO_G431KB
        default "nucleo-g431rb"                if ARCH_BOARD_NUCLEO_G431RB
        default "nucleo-g474re"                if ARCH_BOARD_NUCLEO_G474RE
+       default "nucleo-g491re"                if ARCH_BOARD_NUCLEO_G491RE
        default "b-l072z-lrwan1"               if ARCH_BOARD_B_L072Z_LRWAN1
        default "b-l475e-iot01a"               if ARCH_BOARD_B_L475E_IOT01A
        default "b-u585i-iot02a"               if ARCH_BOARD_B_U585I_IOT02A
diff --git a/boards/arm/stm32g4/nucleo-g491re/CMakeLists.txt 
b/boards/arm/stm32g4/nucleo-g491re/CMakeLists.txt
new file mode 100644
index 00000000000..cdf8f8f799f
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/CMakeLists.txt
@@ -0,0 +1,23 @@
+# 
##############################################################################
+# boards/arm/stm32g4/nucleo-g491re/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more 
contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may 
not
+# use this file except in compliance with the License.  You may obtain a copy 
of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# 
##############################################################################
+
+add_subdirectory(src)
diff --git a/boards/arm/stm32g4/nucleo-g491re/Kconfig 
b/boards/arm/stm32g4/nucleo-g491re/Kconfig
new file mode 100644
index 00000000000..6018a478479
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/Kconfig
@@ -0,0 +1,7 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+if ARCH_BOARD_NUCLEO_G491RE
+endif # ARCH_BOARD_NUCLEO_G491RE
diff --git a/boards/arm/stm32g4/nucleo-g491re/configs/nsh/defconfig 
b/boards/arm/stm32g4/nucleo-g491re/configs/nsh/defconfig
new file mode 100644
index 00000000000..12baf3bbfae
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/configs/nsh/defconfig
@@ -0,0 +1,36 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed 
.config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that 
includes your
+# modifications.
+#
+# CONFIG_ARCH_LEDS is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="nucleo-g491re"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_NUCLEO_G491RE=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP="stm32g4"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32G491R=y
+CONFIG_ARCH_CHIP_STM32G4=y
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LINE_MAX=64
+CONFIG_LPUART1_SERIAL_CONSOLE=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_RAM_SIZE=98304
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_STM32_LPUART1=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
diff --git a/boards/arm/stm32g4/nucleo-g491re/include/board.h 
b/boards/arm/stm32g4/nucleo-g491re/include/board.h
new file mode 100644
index 00000000000..27dc47a3d13
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/include/board.h
@@ -0,0 +1,182 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/include/board.h
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_ARM_STM32G4_NUCLEO_G491RE_INCLUDE_BOARD_H
+#define __BOARDS_ARM_STM32G4_NUCLEO_G491RE_INCLUDE_BOARD_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Clocking *****************************************************************/
+
+#undef STM32_BOARD_XTAL                        /* Not installed */
+
+#define STM32_HSI_FREQUENCY            16000000ul          /* 16MHz */
+#define STM32_LSI_FREQUENCY            32000               /* 32kHz */
+#undef STM32_HSE_FREQUENCY                     /* Not installed */
+#undef STM32_LSE_FREQUENCY                     /* Not installed */
+
+/* Main PLL Configuration.
+ *
+ * PLL source is HSI = 16MHz
+ * PLLN = 85, PLLM = 4, PLLP = 10, PLLQ = 2, PLLR = 2
+ *
+ * f(VCO Clock) = f(PLL Clock Input) x (PLLN / PLLM)
+ * f(PLL_P) = f(VCO Clock) / PLLP
+ * f(PLL_Q) = f(VCO Clock) / PLLQ
+ * f(PLL_R) = f(VCO Clock) / PLLR
+ *
+ * Where:
+ * 8 <= PLLN <= 127
+ * 1 <= PLLM <= 16
+ * PLLP = 2 through 31
+ * PLLQ = 2, 4, 6, or 8
+ * PLLR = 2, 4, 6, or 8
+ *
+ * Do not exceed 170MHz on f(PLL_P), f(PLL_Q), or f(PLL_R).
+ * 64MHz <= f(VCO Clock) <= 344MHz.
+ *
+ * Given the above:
+ *
+ * f(VCO Clock) = HSI   x PLLN / PLLM
+ *              = 16MHz x 85   / 4
+ *              = 340MHz
+ *
+ * PLLPCLK      = f(VCO Clock) / PLLP
+ *              = 340MHz       / 10
+ *              = 34MHz
+ *                (May be used for ADC)
+ *
+ * PLLQCLK      = f(VCO Clock) / PLLQ
+ *              = 340MHz       / 2
+ *              = 170MHz
+ *                (May be used for QUADSPI, FDCAN, SAI1, I2S3. If set to
+ *                48MHz, may be used for USB, RNG.)
+ *
+ * PLLRCLK      = f(VCO Clock) / PLLR
+ *              = 340MHz       / 2
+ *              = 170MHz
+ *                (May be used for SYSCLK and most peripherals.)
+ */
+
+#define STM32_PLLCFGR_PLLSRC           RCC_PLLCFGR_PLLSRC_HSI
+#define STM32_PLLCFGR_PLLCFG           (RCC_PLLCFGR_PLLPEN | \
+                                       RCC_PLLCFGR_PLLQEN | \
+                                       RCC_PLLCFGR_PLLREN)
+
+#define STM32_PLLCFGR_PLLN             RCC_PLLCFGR_PLLN(85)
+#define STM32_PLLCFGR_PLLM             RCC_PLLCFGR_PLLM(4)
+#define STM32_PLLCFGR_PLLP             RCC_PLLCFGR_PLLPDIV(10)
+#define STM32_PLLCFGR_PLLQ             RCC_PLLCFGR_PLLQ_2
+#define STM32_PLLCFGR_PLLR             RCC_PLLCFGR_PLLR_2
+
+#define STM32_VCO_FREQUENCY            ((STM32_HSI_FREQUENCY / 4) * 85)
+#define STM32_PLLP_FREQUENCY           (STM32_VCO_FREQUENCY / 10)
+#define STM32_PLLQ_FREQUENCY           (STM32_VCO_FREQUENCY / 2)
+#define STM32_PLLR_FREQUENCY           (STM32_VCO_FREQUENCY / 2)
+
+/* Use the PLL and set the SYSCLK source to be PLLR (170MHz) */
+
+#define STM32_SYSCLK_SW                RCC_CFGR_SW_PLL
+#define STM32_SYSCLK_SWS               RCC_CFGR_SWS_PLL
+#define STM32_SYSCLK_FREQUENCY         STM32_PLLR_FREQUENCY
+
+/* AHB clock (HCLK) is SYSCLK (170MHz) */
+
+#define STM32_RCC_CFGR_HPRE            RCC_CFGR_HPRE_SYSCLK
+#define STM32_HCLK_FREQUENCY           STM32_SYSCLK_FREQUENCY
+
+/* APB1 clock (PCLK1) is HCLK (170MHz) */
+
+#define STM32_RCC_CFGR_PPRE1           RCC_CFGR_PPRE1_HCLK
+#define STM32_PCLK1_FREQUENCY          STM32_HCLK_FREQUENCY
+
+/* APB2 clock (PCLK2) is HCLK (170MHz) */
+
+#define STM32_RCC_CFGR_PPRE2           RCC_CFGR_PPRE2_HCLK
+#define STM32_PCLK2_FREQUENCY          STM32_HCLK_FREQUENCY
+
+/* Timers driven from APB2 will be PCLK2 */
+
+#define STM32_TIM1_CLKIN               STM32_PCLK2_FREQUENCY
+#define STM32_TIM8_CLKIN               STM32_PCLK2_FREQUENCY
+#define STM32_TIM15_CLKIN              STM32_PCLK2_FREQUENCY
+#define STM32_TIM16_CLKIN              STM32_PCLK2_FREQUENCY
+#define STM32_TIM17_CLKIN              STM32_PCLK2_FREQUENCY
+#define STM32_TIM20_CLKIN              STM32_PCLK2_FREQUENCY
+
+/* Timers driven from APB1 will be PCLK1 */
+
+#define STM32_TIM2_CLKIN               STM32_PCLK1_FREQUENCY
+#define STM32_TIM3_CLKIN               STM32_PCLK1_FREQUENCY
+#define STM32_TIM4_CLKIN               STM32_PCLK1_FREQUENCY
+#define STM32_TIM6_CLKIN               STM32_PCLK1_FREQUENCY
+#define STM32_TIM7_CLKIN               STM32_PCLK1_FREQUENCY
+
+/* LPTIM1 kernel clock is PCLK1 (RCC_CCIPR LPTIM1SEL reset value) */
+
+#define STM32_LPTIM1_CLKIN             STM32_PCLK1_FREQUENCY
+
+/* LPUART1 is connected to the ST-LINK virtual COM port. */
+
+#define GPIO_LPUART1_TX                GPIO_LPUART1_TX_1   /* PA2 */
+#define GPIO_LPUART1_RX                GPIO_LPUART1_RX_1   /* PA3 */
+
+/* USART3 on CN7 pins 1 and 2. */
+
+#define GPIO_USART3_TX                 GPIO_USART3_TX_3    /* PC10 */
+#define GPIO_USART3_RX                 GPIO_USART3_RX_3    /* PC11 */
+
+/* User LEDs */
+
+#define BOARD_LED1                     0 /* User LD2 */
+#define BOARD_NLEDS                    1
+
+#define BOARD_LED1_BIT                 (1 << BOARD_LED1)
+
+/* NuttX LED state mapping.  LD2 is active high. */
+
+#define LED_STARTED                    0
+#define LED_HEAPALLOCATE               0
+#define LED_IRQSENABLED                0
+#define LED_STACKCREATED               1
+#define LED_INIRQ                      2
+#define LED_SIGNAL                     2
+#define LED_ASSERTION                  2
+#define LED_PANIC                      1
+#define LED_IDLE                       0
+
+/* User button B1 is active high. */
+
+#define BUTTON_USER                    0
+#define NUM_BUTTONS                    1
+
+#define BUTTON_USER_BIT                (1 << BUTTON_USER)
+
+#endif /* __BOARDS_ARM_STM32G4_NUCLEO_G491RE_INCLUDE_BOARD_H */
diff --git a/boards/arm/stm32g4/nucleo-g491re/scripts/Make.defs 
b/boards/arm/stm32g4/nucleo-g491re/scripts/Make.defs
new file mode 100644
index 00000000000..e57b3ec6cba
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/scripts/Make.defs
@@ -0,0 +1,47 @@
+############################################################################
+# boards/arm/stm32g4/nucleo-g491re/scripts/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(TOPDIR)/.config
+include $(TOPDIR)/tools/Config.mk
+include $(TOPDIR)/arch/arm/src/armv7-m/Toolchain.defs
+
+ifeq ($(CONFIG_STM32_DFU),y)
+  LDSCRIPT = ld.script.dfu
+else
+  LDSCRIPT = ld.script
+endif
+
+ARCHSCRIPT += $(BOARD_DIR)$(DELIM)scripts$(DELIM)$(LDSCRIPT)
+
+CFLAGS := $(ARCHCFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) 
$(ARCHDEFINES) $(EXTRAFLAGS)
+CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) 
$(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
+CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
+AFLAGS := $(CFLAGS) -D__ASSEMBLY__
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) 
-T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
+
+# Embed absolute path to source file in debug information so that Eclipse
+# source level debugging won't get confused. See:
+# 
https://stackoverflow.com/questions/1275476/gcc-gdb-how-to-embed-absolute-path-to-source-file-in-debug-information
+CFLAGS += -fdebug-prefix-map=..=$(readlink -f ..)
diff --git a/boards/arm/stm32g4/nucleo-g491re/scripts/ld.script 
b/boards/arm/stm32g4/nucleo-g491re/scripts/ld.script
new file mode 100644
index 00000000000..27eea7a0783
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/scripts/ld.script
@@ -0,0 +1,138 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/scripts/ld.script
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+/* The STM32G491RE has 512 KiB of FLASH beginning at address 0x0800:0000.
+ *
+ * When booting from FLASH, FLASH memory is aliased to address 0x0000:0000
+ * where the code expects to begin execution by jumping to the entry point in
+ * the 0x0800:0000 address range.
+ *
+ * The STM32G491RE has a total of 112 KiB of SRAM in three separate areas:
+ *
+ * 1) 80 KiB SRAM1 mapped at 0x2000:0000 thru 0x2001:3fff.
+ * 2) 16 KiB SRAM2 mapped at 0x2001:4000 thru 0x2001:7fff.
+ *
+ * CCM SRAM (Routine Booster):
+ *
+ * 3) 16 KiB CCM SRAM mapped at 0x1000:0000 thru 0x1000:3fff
+ *    but also aliased at 0x2001:8000 thru 0x2001:bfff to be contiguous
+ *    with the SRAM1 and SRAM2.
+ *
+ * Because SRAM1 and SRAM2 are contiguous, they are treated as one region
+ * by this logic.
+ *
+ * CCM SRAM is also contiguous to SRAM1 and SRAM2, however it is excluded
+ * from this linker script, to keep it reserved for special uses in code.
+ */
+
+MEMORY
+{
+    flash (rx) : ORIGIN = 0x08000000, LENGTH = 512K
+    sram (rwx) : ORIGIN = 0x20000000, LENGTH = 96K
+}
+
+OUTPUT_ARCH(arm)
+EXTERN(_vectors)
+ENTRY(_stext)
+
+SECTIONS
+{
+    .text : {
+        _stext = ABSOLUTE(.);
+        *(.vectors)
+        *(.text .text.*)
+        *(.fixup)
+        *(.gnu.warning)
+        *(.rodata .rodata.*)
+        *(.gnu.linkonce.t.*)
+        *(.glue_7)
+        *(.glue_7t)
+        *(.got)
+        *(.gcc_except_table)
+        *(.gnu.linkonce.r.*)
+        _etext = ABSOLUTE(.);
+    } > flash
+
+    .init_section : ALIGN(4) {
+        _sinit = ABSOLUTE(.);
+        KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*) 
SORT_BY_INIT_PRIORITY(.ctors.*)))
+        KEEP(*(.init_array EXCLUDE_FILE(*crtbegin.o *crtbegin?.o *crtend.o 
*crtend?.o) .ctors))
+        _einit = ABSOLUTE(.);
+    } > flash
+
+    .ARM.extab : ALIGN(4) {
+        *(.ARM.extab*)
+    } > flash
+
+    .ARM.exidx : ALIGN(4) {
+    __exidx_start = ABSOLUTE(.);
+        *(.ARM.exidx*)
+        __exidx_end = ABSOLUTE(.);
+    } > flash
+
+    .tdata : {
+        _stdata = ABSOLUTE(.);
+        *(.tdata .tdata.* .gnu.linkonce.td.*);
+        _etdata = ABSOLUTE(.);
+    } > flash
+
+    .tbss : {
+        _stbss = ABSOLUTE(.);
+        *(.tbss .tbss.* .gnu.linkonce.tb.* .tcommon);
+        _etbss = ABSOLUTE(.);
+    } > flash
+
+    _eronly = ABSOLUTE(.);
+
+    .data : ALIGN(4) {
+        _sdata = ABSOLUTE(.);
+        *(.data .data.*)
+        *(.gnu.linkonce.d.*)
+        CONSTRUCTORS
+        . = ALIGN(4);
+        _edata = ABSOLUTE(.);
+    } > sram AT > flash
+
+    .bss : ALIGN(4) {
+        _sbss = ABSOLUTE(.);
+        *(.bss .bss.*)
+        *(.gnu.linkonce.b.*)
+        *(COMMON)
+        . = ALIGN(8);
+        _ebss = ABSOLUTE(.);
+    } > sram
+
+    /* Stabs debugging sections. */
+
+    .stab 0 : { *(.stab) }
+    .stabstr 0 : { *(.stabstr) }
+    .stab.excl 0 : { *(.stab.excl) }
+    .stab.exclstr 0 : { *(.stab.exclstr) }
+    .stab.index 0 : { *(.stab.index) }
+    .stab.indexstr 0 : { *(.stab.indexstr) }
+    .comment 0 : { *(.comment) }
+    .debug_abbrev 0 : { *(.debug_abbrev) }
+    .debug_info 0 : { *(.debug_info) }
+    .debug_line 0 : { *(.debug_line) }
+    .debug_pubnames 0 : { *(.debug_pubnames) }
+    .debug_aranges 0 : { *(.debug_aranges) }
+}
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/CMakeLists.txt 
b/boards/arm/stm32g4/nucleo-g491re/src/CMakeLists.txt
new file mode 100644
index 00000000000..066acd9292c
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/CMakeLists.txt
@@ -0,0 +1,37 @@
+# 
##############################################################################
+# boards/arm/stm32g4/nucleo-g491re/src/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more 
contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may 
not
+# use this file except in compliance with the License.  You may obtain a copy 
of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# 
##############################################################################
+
+set(SRCS stm32_boot.c stm32_bringup.c)
+
+if(CONFIG_ARCH_LEDS)
+  list(APPEND SRCS stm32_autoleds.c)
+else()
+  list(APPEND SRCS stm32_userleds.c)
+endif()
+
+if(CONFIG_ARCH_BUTTONS)
+  list(APPEND SRCS stm32_buttons.c)
+endif()
+
+target_sources(board PRIVATE ${SRCS})
+
+set_property(GLOBAL PROPERTY LD_SCRIPT "${NUTTX_BOARD_DIR}/scripts/ld.script")
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/Make.defs 
b/boards/arm/stm32g4/nucleo-g491re/src/Make.defs
new file mode 100644
index 00000000000..657ca96fc92
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/Make.defs
@@ -0,0 +1,41 @@
+############################################################################
+# boards/arm/stm32g4/nucleo-g491re/src/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+
+-include $(TOPDIR)/Make.defs
+
+ASRCS =
+CSRCS = stm32_boot.c stm32_bringup.c
+
+ifeq ($(CONFIG_ARCH_LEDS),y)
+CSRCS += stm32_autoleds.c
+else
+CSRCS += stm32_userleds.c
+endif
+
+ifeq ($(CONFIG_ARCH_BUTTONS),y)
+CSRCS += stm32_buttons.c
+endif
+
+DEPPATH += --dep-path board
+VPATH += :board
+CFLAGS += 
${INCDIR_PREFIX}$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)board
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/nucleo-g491re.h 
b/boards/arm/stm32g4/nucleo-g491re/src/nucleo-g491re.h
new file mode 100644
index 00000000000..fb4340f60a9
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/nucleo-g491re.h
@@ -0,0 +1,62 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/src/nucleo-g491re.h
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_ARM_STM32G4_NUCLEO_G491RE_SRC_NUCLEO_G491RE_H
+#define __BOARDS_ARM_STM32G4_NUCLEO_G491RE_SRC_NUCLEO_G491RE_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <arch/board/board.h>
+
+#include "stm32.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* NUCLEO-G491RE GPIOs ******************************************************/
+
+/* LD2 is connected to PA5 and is active high. */
+
+#define GPIO_LD2        (GPIO_OUTPUT | GPIO_PUSHPULL | GPIO_SPEED_5MHz | \
+                         GPIO_OUTPUT_CLEAR | GPIO_PORTA | GPIO_PIN5)
+
+/* B1 USER is connected to PC13 and is active high. */
+
+#define MIN_IRQBUTTON   BUTTON_USER
+#define MAX_IRQBUTTON   BUTTON_USER
+#define NUM_IRQBUTTONS  1
+
+#define GPIO_BTN_USER   (GPIO_INPUT | GPIO_FLOAT | GPIO_EXTI | \
+                         GPIO_PORTC | GPIO_PIN13)
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+int stm32_bringup(void);
+
+#endif /* __BOARDS_ARM_STM32G4_NUCLEO_G491RE_SRC_NUCLEO_G491RE_H */
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/stm32_autoleds.c 
b/boards/arm/stm32g4/nucleo-g491re/src/stm32_autoleds.c
new file mode 100644
index 00000000000..855541ec62c
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/stm32_autoleds.c
@@ -0,0 +1,58 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/src/stm32_autoleds.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+
+#include <nuttx/board.h>
+
+#include "nucleo-g491re.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void board_autoled_initialize(void)
+{
+  stm32_configgpio(GPIO_LD2);
+}
+
+void board_autoled_on(int led)
+{
+  if (led == LED_STACKCREATED || led == LED_PANIC)
+    {
+      stm32_gpiowrite(GPIO_LD2, true);
+    }
+}
+
+void board_autoled_off(int led)
+{
+  if (led == LED_PANIC)
+    {
+      stm32_gpiowrite(GPIO_LD2, false);
+    }
+}
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/stm32_boot.c 
b/boards/arm/stm32g4/nucleo-g491re/src/stm32_boot.c
new file mode 100644
index 00000000000..867d835ddda
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/stm32_boot.c
@@ -0,0 +1,49 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/src/stm32_boot.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/board.h>
+
+#include "nucleo-g491re.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void stm32_boardinitialize(void)
+{
+#ifdef CONFIG_ARCH_LEDS
+  board_autoled_initialize();
+#endif
+}
+
+#ifdef CONFIG_BOARD_LATE_INITIALIZE
+void board_late_initialize(void)
+{
+  stm32_bringup();
+}
+#endif
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/stm32_bringup.c 
b/boards/arm/stm32g4/nucleo-g491re/src/stm32_bringup.c
new file mode 100644
index 00000000000..ab1a94ae115
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/stm32_bringup.c
@@ -0,0 +1,66 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/src/stm32_bringup.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <syslog.h>
+
+#include <nuttx/board.h>
+#include <nuttx/input/buttons.h>
+
+#include "board_common.h"
+#include "nucleo-g491re.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int stm32_bringup(void)
+{
+  int ret;
+
+  /* Initialize the board features common to all STM32 boards */
+
+  ret = stm32_common_initialize();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_common_initialize() failed: %d\n",
+             ret);
+    }
+
+#ifdef CONFIG_INPUT_BUTTONS
+  /* Register the BUTTON lower-half driver. */
+
+  ret = btn_lower_initialize("/dev/buttons");
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: btn_lower_initialize() failed: %d\n", ret);
+    }
+#endif
+
+  UNUSED(ret);
+  return OK;
+}
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/stm32_buttons.c 
b/boards/arm/stm32g4/nucleo-g491re/src/stm32_buttons.c
new file mode 100644
index 00000000000..9889385a281
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/stm32_buttons.c
@@ -0,0 +1,62 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/src/stm32_buttons.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <errno.h>
+
+#include <nuttx/board.h>
+
+#include "nucleo-g491re.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+uint32_t board_button_initialize(void)
+{
+  stm32_configgpio(GPIO_BTN_USER);
+  return NUM_BUTTONS;
+}
+
+uint32_t board_buttons(void)
+{
+  return stm32_gpioread(GPIO_BTN_USER) ? BUTTON_USER_BIT : 0;
+}
+
+#ifdef CONFIG_ARCH_IRQBUTTONS
+int board_button_irq(int id, xcpt_t irqhandler, void *arg)
+{
+  if (id != BUTTON_USER)
+    {
+      return -EINVAL;
+    }
+
+  return stm32_gpiosetevent(GPIO_BTN_USER, true, true, true,
+                            irqhandler, arg);
+}
+#endif
diff --git a/boards/arm/stm32g4/nucleo-g491re/src/stm32_userleds.c 
b/boards/arm/stm32g4/nucleo-g491re/src/stm32_userleds.c
new file mode 100644
index 00000000000..2129786f922
--- /dev/null
+++ b/boards/arm/stm32g4/nucleo-g491re/src/stm32_userleds.c
@@ -0,0 +1,56 @@
+/****************************************************************************
+ * boards/arm/stm32g4/nucleo-g491re/src/stm32_userleds.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.  The
+ *  ASF licenses this file to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance with the
+ *  License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+
+#include <nuttx/board.h>
+
+#include "nucleo-g491re.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+uint32_t board_userled_initialize(void)
+{
+  stm32_configgpio(GPIO_LD2);
+  return BOARD_NLEDS;
+}
+
+void board_userled(int led, bool ledon)
+{
+  if (led == BOARD_LED1)
+    {
+      stm32_gpiowrite(GPIO_LD2, ledon);
+    }
+}
+
+void board_userled_all(uint32_t ledset)
+{
+  stm32_gpiowrite(GPIO_LD2, (ledset & BOARD_LED1_BIT) != 0);
+}

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