* [PATCH v4 1/2] hw/arm: Add minimal support for the STM32L4x5 SoC
2023-12-21 21:32 [PATCH v4 0/2] Add minimal support for the B-L475E-IOT01A board Inès Varhol
@ 2023-12-21 21:32 ` Inès Varhol
2024-01-04 12:49 ` Philippe Mathieu-Daudé
2023-12-21 21:32 ` [PATCH v4 2/2] hw/arm: Add minimal support for the B-L475E-IOT01A board Inès Varhol
1 sibling, 1 reply; 6+ messages in thread
From: Inès Varhol @ 2023-12-21 21:32 UTC (permalink / raw)
To: qemu-devel
Cc: qemu-arm, alistair, philmd, peter.maydell, arnaud.minier,
ines.varhol
This patch adds a new STM32L4x5 SoC, it is necessary to add support for
the B-L475E-IOT01A board.
The implementation is derived from the STM32F405 SoC.
The implementation contains no peripherals, only memory regions are
implemented.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>
---
MAINTAINERS | 8 +
hw/arm/Kconfig | 5 +
hw/arm/meson.build | 1 +
hw/arm/stm32l4x5_soc.c | 268 +++++++++++++++++++++++++++++++++
include/hw/arm/stm32l4x5_soc.h | 59 ++++++++
5 files changed, 341 insertions(+)
create mode 100644 hw/arm/stm32l4x5_soc.c
create mode 100644 include/hw/arm/stm32l4x5_soc.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 695e0bd34f..e5b28aee28 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1123,6 +1123,14 @@ L: qemu-arm@nongnu.org
S: Maintained
F: hw/arm/olimex-stm32-h405.c
+STM32L4x5 SoC Family
+M: Arnaud Minier <arnaud.minier@telecom-paris.fr>
+M: Inès Varhol <ines.varhol@telecom-paris.fr>
+L: qemu-arm@nongnu.org
+S: Maintained
+F: hw/arm/stm32l4x5_soc.c
+F: include/hw/arm/stm32l4x5_soc.h
+
SmartFusion2
M: Subbaraya Sundeep <sundeep.lkml@gmail.com>
M: Peter Maydell <peter.maydell@linaro.org>
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 3ada335a24..d2b94d9a47 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -448,6 +448,11 @@ config STM32F405_SOC
select STM32F4XX_SYSCFG
select STM32F4XX_EXTI
+config STM32L4X5_SOC
+ bool
+ select ARM_V7M
+ select OR_IRQ
+
config XLNX_ZYNQMP_ARM
bool
default y if PIXMAN
diff --git a/hw/arm/meson.build b/hw/arm/meson.build
index 68245d3ad1..9766da10c4 100644
--- a/hw/arm/meson.build
+++ b/hw/arm/meson.build
@@ -42,6 +42,7 @@ arm_ss.add(when: 'CONFIG_RASPI', if_true: files('bcm2836.c', 'raspi.c'))
arm_ss.add(when: 'CONFIG_STM32F100_SOC', if_true: files('stm32f100_soc.c'))
arm_ss.add(when: 'CONFIG_STM32F205_SOC', if_true: files('stm32f205_soc.c'))
arm_ss.add(when: 'CONFIG_STM32F405_SOC', if_true: files('stm32f405_soc.c'))
+arm_ss.add(when: 'CONFIG_STM32L4X5_SOC', if_true: files('stm32l4x5_soc.c'))
arm_ss.add(when: 'CONFIG_XLNX_ZYNQMP_ARM', if_true: files('xlnx-zynqmp.c', 'xlnx-zcu102.c'))
arm_ss.add(when: 'CONFIG_XLNX_VERSAL', if_true: files('xlnx-versal.c', 'xlnx-versal-virt.c'))
arm_ss.add(when: 'CONFIG_FSL_IMX25', if_true: files('fsl-imx25.c', 'imx25_pdk.c'))
diff --git a/hw/arm/stm32l4x5_soc.c b/hw/arm/stm32l4x5_soc.c
new file mode 100644
index 0000000000..7513db0d6a
--- /dev/null
+++ b/hw/arm/stm32l4x5_soc.c
@@ -0,0 +1,268 @@
+/*
+ * STM32L4x5 SoC family
+ *
+ * Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr>
+ * Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ * This work is heavily inspired by the stm32f405_soc by Alistair Francis.
+ * Original code is licensed under the MIT License:
+ *
+ * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
+ */
+
+/*
+ * The reference used is the STMicroElectronics RM0351 Reference manual
+ * for STM32L4x5 and STM32L4x6 advanced Arm ® -based 32-bit MCUs.
+ * https://www.st.com/en/microcontrollers-microprocessors/stm32l4x5/documentation.html
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/units.h"
+#include "qapi/error.h"
+#include "exec/address-spaces.h"
+#include "sysemu/sysemu.h"
+#include "hw/arm/stm32l4x5_soc.h"
+#include "hw/qdev-clock.h"
+#include "hw/misc/unimp.h"
+
+#define FLASH_BASE_ADDRESS 0x08000000
+#define SRAM1_BASE_ADDRESS 0x20000000
+#define SRAM1_SIZE (96 * KiB)
+#define SRAM2_BASE_ADDRESS 0x10000000
+#define SRAM2_SIZE (32 * KiB)
+
+static void stm32l4x5_soc_initfn(Object *obj)
+{
+ Stm32l4x5SocState *s = STM32L4X5_SOC(obj);
+
+ s->sysclk = qdev_init_clock_in(DEVICE(s), "sysclk", NULL, NULL, 0);
+ s->refclk = qdev_init_clock_in(DEVICE(s), "refclk", NULL, NULL, 0);
+}
+
+static void stm32l4x5_soc_realize(DeviceState *dev_soc, Error **errp)
+{
+ ERRP_GUARD();
+ Stm32l4x5SocState *s = STM32L4X5_SOC(dev_soc);
+ const Stm32l4x5SocClass *sc = STM32L4X5_SOC_GET_CLASS(dev_soc);
+ MemoryRegion *system_memory = get_system_memory();
+ DeviceState *armv7m;
+
+ /*
+ * We use s->refclk internally and only define it with qdev_init_clock_in()
+ * so it is correctly parented and not leaked on an init/deinit; it is not
+ * intended as an externally exposed clock.
+ */
+ if (clock_has_source(s->refclk)) {
+ error_setg(errp, "refclk clock must not be wired up by the board code");
+ return;
+ }
+
+ if (!clock_has_source(s->sysclk)) {
+ error_setg(errp, "sysclk clock must be wired up by the board code");
+ return;
+ }
+
+ /*
+ * TODO: ideally we should model the SoC RCC and its ability to
+ * change the sysclk frequency and define different sysclk sources.
+ */
+
+ /* The refclk always runs at frequency HCLK / 8 */
+ clock_set_mul_div(s->refclk, 8, 1);
+ clock_set_source(s->refclk, s->sysclk);
+
+ memory_region_init_rom(&s->flash, OBJECT(dev_soc), "flash",
+ sc->flash_size, errp);
+ if (*errp) {
+ return;
+ }
+ memory_region_init_alias(&s->flash_alias, OBJECT(dev_soc),
+ "flash_boot_alias", &s->flash, 0,
+ sc->flash_size);
+
+ memory_region_add_subregion(system_memory, FLASH_BASE_ADDRESS, &s->flash);
+ memory_region_add_subregion(system_memory, 0, &s->flash_alias);
+
+ memory_region_init_ram(&s->sram1, OBJECT(dev_soc), "SRAM1", SRAM1_SIZE,
+ errp);
+ if (*errp) {
+ return;
+ }
+ memory_region_add_subregion(system_memory, SRAM1_BASE_ADDRESS, &s->sram1);
+
+ memory_region_init_ram(&s->sram2, OBJECT(dev_soc), "SRAM2", SRAM2_SIZE,
+ errp);
+ if (*errp) {
+ return;
+ }
+ memory_region_add_subregion(system_memory, SRAM2_BASE_ADDRESS, &s->sram2);
+
+ object_initialize_child(OBJECT(dev_soc), "armv7m", &s->armv7m, TYPE_ARMV7M);
+ armv7m = DEVICE(&s->armv7m);
+ qdev_prop_set_uint32(armv7m, "num-irq", 96);
+ qdev_prop_set_string(armv7m, "cpu-type", ARM_CPU_TYPE_NAME("cortex-m4"));
+ qdev_prop_set_bit(armv7m, "enable-bitband", true);
+ qdev_connect_clock_in(armv7m, "cpuclk", s->sysclk);
+ qdev_connect_clock_in(armv7m, "refclk", s->refclk);
+ object_property_set_link(OBJECT(&s->armv7m), "memory",
+ OBJECT(system_memory), &error_abort);
+ if (!sysbus_realize(SYS_BUS_DEVICE(&s->armv7m), errp)) {
+ return;
+ }
+
+ /* APB1 BUS */
+ create_unimplemented_device("TIM2", 0x40000000, 0x400);
+ create_unimplemented_device("TIM3", 0x40000400, 0x400);
+ create_unimplemented_device("TIM4", 0x40000800, 0x400);
+ create_unimplemented_device("TIM5", 0x40000C00, 0x400);
+ create_unimplemented_device("TIM6", 0x40001000, 0x400);
+ create_unimplemented_device("TIM7", 0x40001400, 0x400);
+ /* RESERVED: 0x40001800, 0x1000 */
+ create_unimplemented_device("RTC", 0x40002800, 0x400);
+ create_unimplemented_device("WWDG", 0x40002C00, 0x400);
+ create_unimplemented_device("IWDG", 0x40003000, 0x400);
+ /* RESERVED: 0x40001800, 0x400 */
+ create_unimplemented_device("SPI2", 0x40003800, 0x400);
+ create_unimplemented_device("SPI3", 0x40003C00, 0x400);
+ /* RESERVED: 0x40004000, 0x400 */
+ create_unimplemented_device("USART2", 0x40004400, 0x400);
+ create_unimplemented_device("USART3", 0x40004800, 0x400);
+ create_unimplemented_device("UART4", 0x40004C00, 0x400);
+ create_unimplemented_device("UART5", 0x40005000, 0x400);
+ create_unimplemented_device("I2C1", 0x40005400, 0x400);
+ create_unimplemented_device("I2C2", 0x40005800, 0x400);
+ create_unimplemented_device("I2C3", 0x40005C00, 0x400);
+ /* RESERVED: 0x40006000, 0x400 */
+ create_unimplemented_device("CAN1", 0x40006400, 0x400);
+ /* RESERVED: 0x40006800, 0x400 */
+ create_unimplemented_device("PWR", 0x40007000, 0x400);
+ create_unimplemented_device("DAC1", 0x40007400, 0x400);
+ create_unimplemented_device("OPAMP", 0x40007800, 0x400);
+ create_unimplemented_device("LPTIM1", 0x40007C00, 0x400);
+ create_unimplemented_device("LPUART1", 0x40008000, 0x400);
+ /* RESERVED: 0x40008400, 0x400 */
+ create_unimplemented_device("SWPMI1", 0x40008800, 0x400);
+ /* RESERVED: 0x40008C00, 0x800 */
+ create_unimplemented_device("LPTIM2", 0x40009400, 0x400);
+ /* RESERVED: 0x40009800, 0x6800 */
+
+ /* APB2 BUS */
+ create_unimplemented_device("SYSCFG", 0x40010000, 0x30);
+ create_unimplemented_device("VREFBUF", 0x40010030, 0x1D0);
+ create_unimplemented_device("COMP", 0x40010200, 0x200);
+ create_unimplemented_device("EXTI", 0x40010400, 0x400);
+ /* RESERVED: 0x40010800, 0x1400 */
+ create_unimplemented_device("FIREWALL", 0x40011C00, 0x400);
+ /* RESERVED: 0x40012000, 0x800 */
+ create_unimplemented_device("SDMMC1", 0x40012800, 0x400);
+ create_unimplemented_device("TIM1", 0x40012C00, 0x400);
+ create_unimplemented_device("SPI1", 0x40013000, 0x400);
+ create_unimplemented_device("TIM8", 0x40013400, 0x400);
+ create_unimplemented_device("USART1", 0x40013800, 0x400);
+ /* RESERVED: 0x40013C00, 0x400 */
+ create_unimplemented_device("TIM15", 0x40014000, 0x400);
+ create_unimplemented_device("TIM16", 0x40014400, 0x400);
+ create_unimplemented_device("TIM17", 0x40014800, 0x400);
+ /* RESERVED: 0x40014C00, 0x800 */
+ create_unimplemented_device("SAI1", 0x40015400, 0x400);
+ create_unimplemented_device("SAI2", 0x40015800, 0x400);
+ /* RESERVED: 0x40015C00, 0x400 */
+ create_unimplemented_device("DFSDM1", 0x40016000, 0x400);
+ /* RESERVED: 0x40016400, 0x9C00 */
+
+ /* AHB1 BUS */
+ create_unimplemented_device("DMA1", 0x40020000, 0x400);
+ create_unimplemented_device("DMA2", 0x40020400, 0x400);
+ /* RESERVED: 0x40020800, 0x800 */
+ create_unimplemented_device("RCC", 0x40021000, 0x400);
+ /* RESERVED: 0x40021400, 0xC00 */
+ create_unimplemented_device("FLASH", 0x40022000, 0x400);
+ /* RESERVED: 0x40022400, 0xC00 */
+ create_unimplemented_device("CRC", 0x40023000, 0x400);
+ /* RESERVED: 0x40023400, 0x400 */
+ create_unimplemented_device("TSC", 0x40024000, 0x400);
+
+ /* RESERVED: 0x40024400, 0x7FDBC00 */
+
+ /* AHB2 BUS */
+ create_unimplemented_device("GPIOA", 0x48000000, 0x400);
+ create_unimplemented_device("GPIOB", 0x48000400, 0x400);
+ create_unimplemented_device("GPIOC", 0x48000800, 0x400);
+ create_unimplemented_device("GPIOD", 0x48000C00, 0x400);
+ create_unimplemented_device("GPIOE", 0x48001000, 0x400);
+ create_unimplemented_device("GPIOF", 0x48001400, 0x400);
+ create_unimplemented_device("GPIOG", 0x48001800, 0x400);
+ create_unimplemented_device("GPIOH", 0x48001C00, 0x400);
+ /* RESERVED: 0x48002000, 0x7FDBC00 */
+ create_unimplemented_device("OTG_FS", 0x50000000, 0x40000);
+ create_unimplemented_device("ADC", 0x50040000, 0x400);
+ /* RESERVED: 0x50040400, 0x20400 */
+ create_unimplemented_device("RNG", 0x50060800, 0x400);
+
+ /* AHB3 BUS */
+ create_unimplemented_device("FMC", 0xA0000000, 0x1000);
+ create_unimplemented_device("QUADSPI", 0xA0001000, 0x400);
+}
+
+static void stm32l4x5_soc_class_init(ObjectClass *klass, void *data)
+{
+
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = stm32l4x5_soc_realize;
+ /* Reason: Mapped at fixed location on the system bus */
+ dc->user_creatable = false;
+ /* No vmstate or reset required: device has no internal state */
+}
+
+static void stm32l4x5xc_soc_class_init(ObjectClass *oc, void *data)
+{
+ Stm32l4x5SocClass *ssc = STM32L4X5_SOC_CLASS(oc);
+
+ ssc->flash_size = 256 * KiB;
+}
+
+static void stm32l4x5xe_soc_class_init(ObjectClass *oc, void *data)
+{
+ Stm32l4x5SocClass *ssc = STM32L4X5_SOC_CLASS(oc);
+
+ ssc->flash_size = 512 * KiB;
+}
+
+static void stm32l4x5xg_soc_class_init(ObjectClass *oc, void *data)
+{
+ Stm32l4x5SocClass *ssc = STM32L4X5_SOC_CLASS(oc);
+
+ ssc->flash_size = 1 * MiB;
+}
+
+static const TypeInfo stm32l4x5_soc_types[] = {
+ {
+ .name = TYPE_STM32L4X5XC_SOC,
+ .parent = TYPE_STM32L4X5_SOC,
+ .class_init = stm32l4x5xc_soc_class_init,
+ }, {
+ .name = TYPE_STM32L4X5XE_SOC,
+ .parent = TYPE_STM32L4X5_SOC,
+ .class_init = stm32l4x5xe_soc_class_init,
+ }, {
+ .name = TYPE_STM32L4X5XG_SOC,
+ .parent = TYPE_STM32L4X5_SOC,
+ .class_init = stm32l4x5xg_soc_class_init,
+ }, {
+ .name = TYPE_STM32L4X5_SOC,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(Stm32l4x5SocState),
+ .instance_init = stm32l4x5_soc_initfn,
+ .class_size = sizeof(Stm32l4x5SocClass),
+ .class_init = stm32l4x5_soc_class_init,
+ .abstract = true,
+ }
+};
+
+DEFINE_TYPES(stm32l4x5_soc_types)
diff --git a/include/hw/arm/stm32l4x5_soc.h b/include/hw/arm/stm32l4x5_soc.h
new file mode 100644
index 0000000000..dce13a023d
--- /dev/null
+++ b/include/hw/arm/stm32l4x5_soc.h
@@ -0,0 +1,59 @@
+/*
+ * STM32L4x5 SoC family
+ *
+ * Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr>
+ * Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ * This work is heavily inspired by the stm32f405_soc by Alistair Francis.
+ * Original code is licensed under the MIT License:
+ *
+ * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
+ */
+
+/*
+ * The reference used is the STMicroElectronics RM0351 Reference manual
+ * for STM32L4x5 and STM32L4x6 advanced Arm ® -based 32-bit MCUs.
+ * https://www.st.com/en/microcontrollers-microprocessors/stm32l4x5/documentation.html
+ */
+
+#ifndef HW_ARM_STM32L4x5_SOC_H
+#define HW_ARM_STM32L4x5_SOC_H
+
+#include "exec/memory.h"
+#include "qemu/units.h"
+#include "hw/qdev-core.h"
+#include "hw/arm/armv7m.h"
+#include "qom/object.h"
+
+#define TYPE_STM32L4X5_SOC "stm32l4x5-soc"
+#define TYPE_STM32L4X5XC_SOC "stm32l4x5xc-soc"
+#define TYPE_STM32L4X5XE_SOC "stm32l4x5xe-soc"
+#define TYPE_STM32L4X5XG_SOC "stm32l4x5xg-soc"
+OBJECT_DECLARE_TYPE(Stm32l4x5SocState, Stm32l4x5SocClass, STM32L4X5_SOC)
+
+struct Stm32l4x5SocState {
+ SysBusDevice parent_obj;
+
+ ARMv7MState armv7m;
+
+ MemoryRegion sram1;
+ MemoryRegion sram2;
+ MemoryRegion flash;
+ MemoryRegion flash_alias;
+
+ Clock *sysclk;
+ Clock *refclk;
+};
+
+struct Stm32l4x5SocClass {
+ SysBusDeviceClass parent_class;
+
+ size_t flash_size;
+};
+
+#endif
--
2.43.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v4 2/2] hw/arm: Add minimal support for the B-L475E-IOT01A board
2023-12-21 21:32 [PATCH v4 0/2] Add minimal support for the B-L475E-IOT01A board Inès Varhol
2023-12-21 21:32 ` [PATCH v4 1/2] hw/arm: Add minimal support for the STM32L4x5 SoC Inès Varhol
@ 2023-12-21 21:32 ` Inès Varhol
2024-01-04 12:55 ` Philippe Mathieu-Daudé
2024-01-04 13:11 ` Philippe Mathieu-Daudé
1 sibling, 2 replies; 6+ messages in thread
From: Inès Varhol @ 2023-12-21 21:32 UTC (permalink / raw)
To: qemu-devel
Cc: qemu-arm, alistair, philmd, peter.maydell, arnaud.minier,
ines.varhol
This commit adds a new B-L475E-IOT01A board using the STM32L475VG SoC
as well as a dedicated documentation file.
The implementation is derived from the Netduino Plus 2 machine.
There are no peripherals implemented yet, only memory regions.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>
---
MAINTAINERS | 7 +++
configs/devices/arm-softmmu/default.mak | 1 +
docs/system/arm/b-l475e-iot01a.rst | 46 ++++++++++++++++
docs/system/arm/stm32.rst | 6 ++-
docs/system/target-arm.rst | 1 +
hw/arm/Kconfig | 6 +++
hw/arm/b-l475e-iot01a.c | 70 +++++++++++++++++++++++++
hw/arm/meson.build | 1 +
8 files changed, 136 insertions(+), 2 deletions(-)
create mode 100644 docs/system/arm/b-l475e-iot01a.rst
create mode 100644 hw/arm/b-l475e-iot01a.c
diff --git a/MAINTAINERS b/MAINTAINERS
index e5b28aee28..3f3831c92a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1131,6 +1131,13 @@ S: Maintained
F: hw/arm/stm32l4x5_soc.c
F: include/hw/arm/stm32l4x5_soc.h
+B-L475E-IOT01A IoT Node
+M: Arnaud Minier <arnaud.minier@telecom-paris.fr>
+M: Inès Varhol <ines.varhol@telecom-paris.fr>
+L: qemu-arm@nongnu.org
+S: Maintained
+F: hw/arm/b-l475e-iot01a.c
+
SmartFusion2
M: Subbaraya Sundeep <sundeep.lkml@gmail.com>
M: Peter Maydell <peter.maydell@linaro.org>
diff --git a/configs/devices/arm-softmmu/default.mak b/configs/devices/arm-softmmu/default.mak
index 980c48a7d9..023faa2f75 100644
--- a/configs/devices/arm-softmmu/default.mak
+++ b/configs/devices/arm-softmmu/default.mak
@@ -19,6 +19,7 @@ CONFIG_ARM_VIRT=y
# CONFIG_NSERIES=n
# CONFIG_STELLARIS=n
# CONFIG_STM32VLDISCOVERY=n
+# CONFIG_B_L475E_IOT01A=n
# CONFIG_REALVIEW=n
# CONFIG_VERSATILE=n
# CONFIG_VEXPRESS=n
diff --git a/docs/system/arm/b-l475e-iot01a.rst b/docs/system/arm/b-l475e-iot01a.rst
new file mode 100644
index 0000000000..2b128e6b84
--- /dev/null
+++ b/docs/system/arm/b-l475e-iot01a.rst
@@ -0,0 +1,46 @@
+B-L475E-IOT01A IoT Node (``b-l475e-iot01a``)
+============================================
+
+The B-L475E-IOT01A IoT Node uses the STM32L475VG SoC which is based on
+ARM Cortex-M4F core. It is part of STMicroelectronics
+:doc:`STM32 boards </system/arm/stm32>` and more specifically the STM32L4
+ultra-low power series. The STM32L4x5 chip runs at up to 80 MHz and
+integrates 128 KiB of SRAM and up to 1MiB of Flash. The B-L475E-IOT01A board
+namely features 64 Mibit QSPI Flash, BT, WiFi and RF connectivity,
+USART, I2C, SPI, CAN and USB OTG, as well as a variety of sensors.
+
+Supported devices
+"""""""""""""""""
+
+Currently, B-L475E-IOT01A machine's implementation is minimal,
+it only supports the following device:
+
+- Cortex-M4F based STM32L4x5 SoC
+
+Missing devices
+"""""""""""""""
+
+The B-L475E-IOT01A does *not* support the following devices:
+
+- Extended interrupts and events controller (EXTI)
+- Reset and clock control (RCC)
+- Serial ports (UART)
+- System configuration controller (SYSCFG)
+- General-purpose I/Os (GPIO)
+- Analog to Digital Converter (ADC)
+- SPI controller
+- Timer controller (TIMER)
+
+See the complete list of unimplemented peripheral devices
+in the STM32L4x5 module : ``./hw/arm/stm32l4x5_soc.c``
+
+Boot options
+""""""""""""
+
+The B-L475E-IOT01A machine can be started using the ``-kernel``
+option to load a firmware. Example:
+
+.. code-block:: bash
+
+ $ qemu-system-arm -M b-l475e-iot01a -kernel firmware.bin
+
diff --git a/docs/system/arm/stm32.rst b/docs/system/arm/stm32.rst
index d7265b763d..3b640f3ee0 100644
--- a/docs/system/arm/stm32.rst
+++ b/docs/system/arm/stm32.rst
@@ -16,11 +16,13 @@ based on this chip :
- ``netduino2`` Netduino 2 board with STM32F205RFT6 microcontroller
-The STM32F4 series is based on ARM Cortex-M4F core. This series is pin-to-pin
-compatible with STM32F2 series. The following machines are based on this chip :
+The STM32F4 series is based on ARM Cortex-M4F core, as well as the STM32L4
+ultra-low-power series. The STM32F4 series is pin-to-pin compatible with STM32F2 series.
+The following machines are based on this ARM Cortex-M4F chip :
- ``netduinoplus2`` Netduino Plus 2 board with STM32F405RGT6 microcontroller
- ``olimex-stm32-h405`` Olimex STM32 H405 board with STM32F405RGT6 microcontroller
+- ``b-l475e-iot01a`` :doc:`B-L475E-IOT01A IoT Node </system/arm/b-l475e-iot01a>` board with STM32L475VG microcontroller
There are many other STM32 series that are currently not supported by QEMU.
diff --git a/docs/system/target-arm.rst b/docs/system/target-arm.rst
index 790ac1b8a2..c9d7c0dda7 100644
--- a/docs/system/target-arm.rst
+++ b/docs/system/target-arm.rst
@@ -84,6 +84,7 @@ undocumented; you can get a complete list by running
arm/vexpress
arm/aspeed
arm/bananapi_m2u.rst
+ arm/b-l475e-iot01a.rst
arm/sabrelite
arm/digic
arm/cubieboard
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index d2b94d9a47..7520dc5cc0 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -448,6 +448,12 @@ config STM32F405_SOC
select STM32F4XX_SYSCFG
select STM32F4XX_EXTI
+config B_L475E_IOT01A
+ bool
+ default y
+ depends on TCG && ARM
+ select STM32L4X5_SOC
+
config STM32L4X5_SOC
bool
select ARM_V7M
diff --git a/hw/arm/b-l475e-iot01a.c b/hw/arm/b-l475e-iot01a.c
new file mode 100644
index 0000000000..c3790e3dc8
--- /dev/null
+++ b/hw/arm/b-l475e-iot01a.c
@@ -0,0 +1,70 @@
+/*
+ * B-L475E-IOT01A Discovery Kit machine
+ * (B-L475E-IOT01A IoT Node)
+ *
+ * Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr>
+ * Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ * This work is heavily inspired by the netduinoplus2 by Alistair Francis.
+ * Original code is licensed under the MIT License:
+ *
+ * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
+ */
+
+/*
+ * The reference used is the STMicroElectronics UM2153 User manual
+ * Discovery kit for IoT node, multi-channel communication with STM32L4.
+ * https://www.st.com/en/evaluation-tools/b-l475e-iot01a.html#documentation
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/boards.h"
+#include "hw/qdev-properties.h"
+#include "hw/qdev-clock.h"
+#include "qemu/error-report.h"
+#include "hw/arm/stm32l4x5_soc.h"
+#include "hw/arm/boot.h"
+
+/* Main SYSCLK frequency in Hz (80MHz) */
+#define SYSCLK_FRQ 80000000ULL
+
+static void b_l475e_iot01a_init(MachineState *machine)
+{
+ const Stm32l4x5SocClass *sc;
+ DeviceState *dev;
+ Clock *sysclk;
+
+ /* This clock doesn't need migration because it is fixed-frequency */
+ sysclk = clock_new(OBJECT(machine), "SYSCLK");
+ clock_set_hz(sysclk, SYSCLK_FRQ);
+
+ dev = qdev_new(TYPE_STM32L4X5XG_SOC);
+ sc = STM32L4X5_SOC_GET_CLASS(dev);
+ qdev_connect_clock_in(dev, "sysclk", sysclk);
+ sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
+
+ armv7m_load_kernel(ARM_CPU(first_cpu),
+ machine->kernel_filename,
+ 0, sc->flash_size);
+}
+
+static void b_l475e_iot01a_machine_init(MachineClass *mc)
+{
+ static const char *machine_valid_cpu_types[] = {
+ ARM_CPU_TYPE_NAME("cortex-m4"),
+ NULL};
+ mc->desc = "B-L475E-IOT01A Discovery Kit (Cortex-M4)";
+ mc->init = b_l475e_iot01a_init;
+ mc->valid_cpu_types = machine_valid_cpu_types;
+
+ /* SRAM pre-allocated as part of the SoC instantiation */
+ mc->default_ram_size = 0;
+}
+
+DEFINE_MACHINE("b-l475e-iot01a", b_l475e_iot01a_machine_init)
diff --git a/hw/arm/meson.build b/hw/arm/meson.build
index 9766da10c4..bb92b27db3 100644
--- a/hw/arm/meson.build
+++ b/hw/arm/meson.build
@@ -42,6 +42,7 @@ arm_ss.add(when: 'CONFIG_RASPI', if_true: files('bcm2836.c', 'raspi.c'))
arm_ss.add(when: 'CONFIG_STM32F100_SOC', if_true: files('stm32f100_soc.c'))
arm_ss.add(when: 'CONFIG_STM32F205_SOC', if_true: files('stm32f205_soc.c'))
arm_ss.add(when: 'CONFIG_STM32F405_SOC', if_true: files('stm32f405_soc.c'))
+arm_ss.add(when: 'CONFIG_B_L475E_IOT01A', if_true: files('b-l475e-iot01a.c'))
arm_ss.add(when: 'CONFIG_STM32L4X5_SOC', if_true: files('stm32l4x5_soc.c'))
arm_ss.add(when: 'CONFIG_XLNX_ZYNQMP_ARM', if_true: files('xlnx-zynqmp.c', 'xlnx-zcu102.c'))
arm_ss.add(when: 'CONFIG_XLNX_VERSAL', if_true: files('xlnx-versal.c', 'xlnx-versal-virt.c'))
--
2.43.0
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