Rss/Bootloader; Limitation; Figure 16. Vdd_Mcu Power Selection - ST STM32L562E-DK User Manual

Figure 16 describes the VDD_MCU power selection on the STM32L562E-DK board.
LCD 240x240 + CTP
6.4

RSS/bootloader

The bootloader is located in the system memory, programmed by ST during production. It is used to reprogram
the flash memory by using USART, I
firmware upgrade). The bootloader is available on all devices. For more details, refer to the application note
STM32 microcontroller system memory boot mode (AN2606), available on the
The root secure services (RSS) are embedded in a flash memory area named the secure information block,
programmed during ST production. For example, it enables secure firmware installation (SFI) thanks to the RSS
extension firmware (RSSe SFI). This feature allows customers to protect the confidentiality of the firmware to be
provisioned into the STM32 when production is subcontracted to an untrusted third-party. The root secure
services are available on all devices, after enabling the TrustZone
The bootloader version can be identified by reading the bootloader ID at the address 0x0BF97FFE.
6.4.1

Limitation

The STM32L5 part soldered on STM32L562E-DK on the product version DK32L562E$AT1 (sticker available on
the top side of the board) embeds the bootloader V9.0 affected by the limitations to be worked around, as
described hereunder. The bootloader ID of the bootloader V9.0 is 0x90.
The following limitations exist in the bootloader V9.0:
Issue observed:
Option byte programming in RDP level 0.5: The user cannot program nonsecure option bytes in RDP level 0.5
through the bootloader.
Proposed workaround:
The user can program option bytes thanks to STM32CubeProgrammer GUI or command-line interfaces through
JTAG. To know how to program option bytes through STM32CubeProgrammer, refer to the user manual
STM32CubeProgrammer software description (UM2237), available on the
Issue observed:
Impossible to set the TZEN option bit: The user cannot set the TZEN option bit through the bootloader interfaces.
UM2617 - Rev 7
Figure 16. VDD_MCU power selection
2
C, SPI, CAN FD, or USB FS in device mode through the DFU (device
VDD_MCU:
- JP3 [1-2]: 3V3 selection
- JP3 [2-3]: 1V8 selection
VDD_MCU:
- SW1 on the right:
- SW1 on the left:
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®
through the TZEN option bit.
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UM2617
RSS/bootloader
No power metering
Power metering capability
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