6

FAQ

6.1

What is the license scheme for the STM32CubeU5 MCU package?

The HAL is distributed under a non-restrictive BSD (berkeley software distribution) license.

The middleware stacks made by STMicroelectronics (ex: USBPD library) come with a licensing model allowing

easy reuse, provided it runs on an STMicroelectronics device.

The middleware based on well-known open-source solutions (TFM) have user-friendly license terms. For more

details, refer to the appropriate middleware license agreement.

6.2

What boards are supported by the STM32CubeU5 MCU package?

The STM32CubeU5 MCU package provides BSP drivers and ready-to-use examples for the following STM32U5

series boards:

•

NUCLEO-U575ZI-Q

•

STM32U575I-EV

•

B-U585I-IOT02A

•

NUCLEO-U5A5ZJ-Q

•

NUCLEO-U545RE-Q

•

STM32U5A9J-DK

•

STM32U5G9J-DK2

•

STM32U5G9J-DK1

6.3

Are any examples provided with the ready-to-use toolset projects?

Yes. STM32CubeU5 provides a rich set of examples and applications. They come with the preconfigured projects

for IAR Embedded Workbench®, Keil®, and STM32CubeIDE.

6.4

How to enable TrustZone® on STM32U5 series devices?

All STM32U5 series devices support TrustZone®. Factory default state is TrustZone® disabled. The TrustZone®

security is activated with the TZEN option bit in the FLASH_OPTR register. The configuration of the user option

bytes may be done with a STM32CubeProgrammer (STM32CubeProg).

6.5

How to disable TrustZone® on STM32U5 series devices?

The following sequence is needed to disable TrustZone®:

•

Boot from user flash memory:

1. Make sure that secure and nonsecure applications are well loaded and executed (jump done on

nonsecure application).

2. Set RDP to level 1 through STM32CubeProgrammer if not yet done. Then only hotplug connection is

possible during nonsecure application execution.

3. Use a power supply different than STLINK in order to be able to connect to the target.

4. Uncheck the "TZEN" box and set RDP to level 0 (option byte value 0xAA), then click on "Apply".

•

Boot from RSS:

1. Make sure to apply a high level on the BOOT0 pin (make sure that "nSWBOOT0 option byte" is

checked).

2. Set RDP to level 1 through STM32CubeProgrammer if not yet done. Then only hotplug connection is

possible during nonsecure application execution.

3. Use a power supply different than STLINK in order to be able to connect to the target.

4. Uncheck the "TZEN" box and set RDP to level 0 (option byte value 0xAA), then click on "Apply".

Refer to AN5347 for more details.

UM2883

FAQ

UM2883 - Rev 4

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