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stm32 ospi driver : run application in external flash memory XIP #93032

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stm32 ospi driver : run application in external flash memory XIP #93032

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@FRASTM FRASTM commented Jul 11, 2025 •
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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 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

etienne-lms
etienne-lms reviewed Jul 15, 2025
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@FRASTM 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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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

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FRASTM commented Jul 15, 2025 •
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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.

JarmouniA
JarmouniA reviewed Jul 15, 2025
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boards/st/b_u585i_iot02a/b_u585i_iot02a.dts Outdated
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For boards that have enough space/sectors in internal Flash to be used without MemMapped external Flash (with or without MCUboot), I think it makes more sense to create a board variant for the App in Ext Flash usecase.
This way, both configurations can be tested in CI without need for extra overlays..., and users will have ready-to-use configurations to choose from depending on their requirements. This will make the conf on MCUboot side simpler as well.

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creating a board variant : b_u585i_iot02a/stm32u585xx/xip

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/ext_flash_app is a more accurate name in my opinion

@FRASTM 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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FRASTM commented Jul 16, 2025

fixing compliance issues

@FRASTM FRASTM force-pushed the stm32u5_xip branch 2 times, most recently from 4028e70 to a08697f Compare July 17, 2025 12:42
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FRASTM commented Jul 17, 2025 •
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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

etienne-lms
etienne-lms reviewed Jul 17, 2025
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FRASTM commented Jul 21, 2025

rebase on 87917a1

@FRASTM FRASTM force-pushed the stm32u5_xip branch 2 times, most recently from 84e4be6 to 30f5ca9 Compare July 22, 2025 11:38
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FRASTM commented Jul 22, 2025

changing the name of the variant to "ext_flash_app"

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FRASTM commented Jul 22, 2025

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

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JarmouniA commented Jul 23, 2025 •
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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

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FRASTM commented Jul 23, 2025

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

@FRASTM FRASTM added platform: STM32 ST Micro STM32 DNM This PR should not be merged (Do Not Merge) labels Jul 23, 2025
FRASTM added 3 commits July 28, 2025 13:16
@FRASTM
boards: st: b_u585i disco kit variant "ext_flash_app" for XIP
f80eefa 
Create a new variant to execute in place on the external octoSPI
flash NOR of the b_u585i_iot02a disco kit

Signed-off-by: Francois Ramu <[email protected]>
@FRASTM
samples: sysbuild: with mcu_boot on the stm32u5 with octoSPI
643b6ed 
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]>
@FRASTM
west.yml: MCUBoot updated to support stm32 variants
eda3d25 
Takes the mcu-tools/mcuboot#2399

Signed-off-by: Francois Ramu <[email protected]>
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Quality Gate Passed Quality Gate passed

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0 New issues
0 Accepted issues

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

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