STM32 OSPI NOR: run application from external flash memory #93032

FRASTM · 2025-07-11T15:01:36Z

Following the stm32h5 run application in external flash memory XIP

This PR makes the samples/sysbuild/with_mcuboot --sysbuild running on a variant of the stm32u585 disco kit.

Requires the ./bootloader/mcuboot/bootzephyr/boards/b_u585i_iot02a_stm32u585xx_ext_flash_app.conf :

CONFIG_BOOT_DIRECT_XIP=y
CONFIG_STM32_MEMMAP=y

run the west build -p -b b_u585i_iot02a/stm32u585xx/ext_flash_app samples/sysbuild/with_mcuboot --sysbuild

*** Booting MCUboot v2.1.0-rc1-390-gfbc9aff5acc1 ***
*** Using Zephyr OS build v4.2.0-rc2-72-g8c58be376223 ***
*** Booting Zephyr OS build v4.2.0-rc2-72-g8c58be376223 ***
Address of sample 0x70000000
Hello sysbuild with mcuboot! b_u585i_iot02a

Requires boot/zephyr/boards/b_u585i_iot02a.conf

CONFIG_BOOT_DIRECT_XIP=y
CONFIG_STM32_MEMMAP=y

boards/st/b_u585i_iot02a/board.cmake

JarmouniA · 2025-07-15T10:03:32Z

Requires boot/zephyr/boards/b_u585i_iot02a.conf
CONFIG_BOOT_DIRECT_XIP=y
CONFIG_STM32_MEMMAP=y

MCUboot mode should not be set on MCUboot side in my opinion, it should be set on Zephyr side using Sysbuild (SB_CONFIG_MCUBOOT_MODE_DIRECT_XIP) at the board or app level so that the setting is propagated properly to both MCUboot and App builds.
Furthermore, this approach is creating some problems already, see #93113

FRASTM · 2025-07-15T10:20:14Z

Define the partition of the external octo NOR in the b_u858i_iot02a.dts to avoid conflict with the partitioning of the b_u858i_iot02a_ns.dts.

boards/st/b_u585i_iot02a/b_u585i_iot02a.dts

FRASTM · 2025-07-16T12:48:29Z

fixing compliance issues

FRASTM · 2025-07-17T12:47:54Z

Creating a variant (only) for the b_u585i_iot02a disco kit : b_u585i_iot02a/stm32u585xx/xip
Requires the mcuboot to define the corresponding conf file: ../bootloader/mcuboot/boot/zephyr/boards/b_u585i_iot02a_stm32u585xx_xip.conf

*** Booting MCUboot v2.1.0-rc1-390-gfbc9aff5acc1 ***
*** Using Zephyr OS build v4.2.0-rc3-36-ga08697fb1810 ***
*** Booting Zephyr OS build v4.2.0-rc3-38-g84c417194c74 ***
Address of sample 0x70000000
Hello sysbuild with mcuboot! b_u585i_iot02a

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_xip.dts

FRASTM · 2025-07-21T09:15:56Z

rebase on 87917a1

FRASTM · 2025-07-22T11:38:32Z

changing the name of the variant to "ext_flash_app"

FRASTM · 2025-07-22T15:28:11Z

rebase

Requires boot/zephyr/boards/b_u585i_iot02a.conf
CONFIG_BOOT_DIRECT_XIP=y
CONFIG_STM32_MEMMAP=y
MCUboot mode should not be set on MCUboot side in my opinion, it should be set on Zephyr side using Sysbuild (SB_CONFIG_MCUBOOT_MODE_DIRECT_XIP) at the board or app level so that the setting is propagated properly to both MCUboot and App builds. Furthermore, this approach is creating some problems already, see #93113

Do you mean that .conf file in the mcuboot do not need to set

CONFIG_BOOT_DIRECT_XIP=y

JarmouniA · 2025-07-23T13:28:48Z

MCUboot mode should not be set on MCUboot side in my opinion, it should be set on Zephyr side using Sysbuild (SB_CONFIG_MCUBOOT_MODE_DIRECT_XIP) at the board or app level so that the setting is propagated properly to both MCUboot and App builds. Furthermore, this approach is creating some problems already, see #93113

Do you mean that .conf file in the mcuboot do not need to set
CONFIG_BOOT_DIRECT_XIP=y

Yes, it doesn't.

zephyr/share/sysbuild/images/bootloader/Kconfig

Line 33 in 47b07e5

choice MCUBOOT_MODE

zephyr/samples/sysbuild/with_mcuboot/sysbuild.conf

Line 5 in 47b07e5

SB_CONFIG_MCUBOOT_MODE_OVERWRITE_ONLY=y

zephyr/soc/espressif/Kconfig.sysbuild

Line 5 in 47b07e5

default MCUBOOT_MODE_OVERWRITE_ONLY if SOC_FAMILY_ESPRESSIF_ESP32

zephyr/boards/nxp/frdm_mcxn236/Kconfig.sysbuild

Line 5 in 47b07e5

default MCUBOOT_MODE_OVERWRITE_ONLY

FRASTM · 2025-07-23T15:36:18Z

Rebase on 47b07e5
Add the link to mcuboot : mcu-tools/mcuboot#2399

sonarqubecloud · 2025-07-28T11:44:42Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

FRASTM · 2025-07-31T07:42:15Z

waiting for the #93762 to report all modifications to stm32 ospi flash and then stm32 flash qspi drivers

FRASTM · 2025-10-03T08:11:33Z

rebase on 727c15a

boards/st/b_u585i_iot02a/b_u585i_iot02a.dts

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_ext_flash_app.yaml

etienne-lms · 2025-10-03T12:32:27Z

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_ext_flash_app.dts

+		zephyr,console = &usart1;
+		zephyr,shell-uart = &usart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;


What is the purpose of zephyr,flash here?

it indicates where to download the application
With this, mcuboot is downloaded in the (internal) flash (like any other samples/basic application).

It should be in MCUboot overlay, please see #97037 and mcu-tools/mcuboot#2479

Removing

chosen { zephyr,flash = &flash0; }

and the samples/hello_world/ cannot build anymore

section `rom_start' will not fit in region `FLASH' region `FLASH' overflowed by 17616 bytes

It should, though, without any mcuboot

The ext_flash_app variant is only meant to be used with MCUboot, and its zephyr,flash should point to external Flash, this way no overlay with be needed at the user app level.

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_ext_flash_app.dts

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_ext_flash_app.yaml

Create a new variant to execute in place on the external octoSPI flash NOR of the b_u585i_iot02a disco kit The flash size in the yaml corresponds to the the slot0 of that external NOR memory. Signed-off-by: Francois Ramu <[email protected]>

Run the sample to execute in place on the external flash of the b_u585i_iot02a variant 'ext_flash_app' disco kit, with_boot application is built and linked for the external flash Signed-off-by: Francois Ramu <[email protected]>

sonarqubecloud · 2025-10-06T10:13:49Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

JarmouniA

Missing Kconfig.sysbuild at the board level, which shall contain at minimum

choice BOOTLOADER
	default BOOTLOADER_MCUBOOT
endchoice

choice MCUBOOT_MODE
	default MCUBOOT_MODE_DIRECT_XIP
endchoice

JarmouniA · 2025-10-06T12:15:35Z

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_ext_flash_app.dts

+		reg = <0x70000000 DT_SIZE_M(64)>;
+		zephyr,memory-region = "EXTMEM";
+		/* The ATTR_MPU_EXTMEM attribut causing a MPU FAULT */
+		zephyr,memory-attr = <DT_MEM_ARM(ATTR_MPU_IO)>;


Suggested change

zephyr,memory-attr = <DT_MEM_ARM(ATTR_MPU_IO)>;

zephyr,memory-attr = <DT_MEM_ARM_MPU_FLASH>;

IO is for memory-mapped devices.

JarmouniA · 2025-10-06T12:16:49Z

boards/st/b_u585i_iot02a/board.cmake

-board_runner_args(stm32cubeprogrammer "--extload=MX25LM51245G_STM32U585I-IOT02A.stldr")
-else()
-board_runner_args(stm32cubeprogrammer "--erase" "--port=swd" "--reset-mode=hw")
+if(CONFIG_STM32_MEMMAP OR (CONFIG_XIP AND CONFIG_BOOTLOADER_MCUBOOT))


Suggested change

if(CONFIG_STM32_MEMMAP OR (CONFIG_XIP AND CONFIG_BOOTLOADER_MCUBOOT))

if(CONFIG_STM32_MEMMAP OR CONFIG_BOOTLOADER_MCUBOOT)

RAM Load MCUboot mode can be used as well.

JarmouniA · 2025-10-06T12:17:17Z

samples/sysbuild/with_mcuboot/boards/b_u585i_iot02a_stm32u585xx_ext_flash_app.overlay

not needed, should be in ext_flash_app variant DTS.

JarmouniA · 2025-10-06T12:23:35Z

boards/st/b_u585i_iot02a/b_u585i_iot02a-common.dtsi

 		data-rate = <OSPI_DTR_TRANSFER>;
 		four-byte-opcodes;
 		status = "okay";
+


st,stm32-ospi-nor binding shall include soc-nv-flash binding, then ext Flash node should define write-block-size and erase-block-size properties, this way MCUboot MAX_IMG_SECTORS will be calculated automatically. See 1st commit of #97037.

JarmouniA · 2025-10-06T13:10:35Z

boards/st/b_u585i_iot02a/b_u585i_iot02a_stm32u585xx_ext_flash_app.yaml

+  - gnuarmemb
+ram: 786
+flash: 416
+vendor: st


Suggested change

vendor: st

vendor: st

sysbuild: true

FRASTM · 2025-10-07T07:57:17Z

to be refined according to the #97037

etienne-lms reviewed Jul 15, 2025

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FRASTM force-pushed the stm32u5_xip branch 2 times, most recently from d02c1a8 to f4991ef Compare July 15, 2025 09:50

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FRASTM changed the title ~~stm32u5 run application in external flash memory XIP~~ stm32 ospi driver : run application in external flash memory XIP Jul 15, 2025

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JarmouniA changed the title ~~stm32 ospi driver : run application in external flash memory XIP~~ STM32 OSPI NOR: run application from external flash memory Oct 6, 2025

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FRASTM closed this Oct 7, 2025

	zephyr,memory-attr = <DT_MEM_ARM(ATTR_MPU_IO)>;
	zephyr,memory-attr = <DT_MEM_ARM_MPU_FLASH>;

	if(CONFIG_STM32_MEMMAP OR (CONFIG_XIP AND CONFIG_BOOTLOADER_MCUBOOT))
	if(CONFIG_STM32_MEMMAP OR CONFIG_BOOTLOADER_MCUBOOT)

STM32 OSPI NOR: run application from external flash memory #93032

STM32 OSPI NOR: run application from external flash memory #93032

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