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STM32U375CE Datasheet(PDF) 13 Page - STMicroelectronics |
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STM32U375CE Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 222 page  The BOOT0 value comes from the PH3-BOOT0 (PB7-BOOT0 for STM32U375CG) pin or from an option bit depending on the value of a user option bit to free the GPIO pad if needed. The bootloader is located in the system memory, programmed by ST during production. The bootloader is used to reprogram the flash memory by using USART, I2C, SPI, FDCAN, or USB FS in device mode through the DFU (device firmware upgrade). The bootloader is available on all devices. Refer to the application note STM32 microcontroller system memory boot mode (AN2606) for more details. The embedded RSS are located in the secure information block, programmed by ST during production. For example, the RSS enable the SFI (secure firmware installation), thanks to the RSSe SFI (RSS extension firmware). This feature allows the customer to produce the confidentiality of the firmware to be provisioned into the STM32, when production is sub-contracted to untrusted third-party. The RSS are available on all devices, after enabling the TrustZone® through the TZEN option bit. Refer to the application note overview secure firmware install (SFI) (AN4992) for more details. Refer to Table 4 and Table 5 for boot modes when TrustZone® is disabled and enabled respectively. Table 4. Boot modes when TrustZone® is disabled (TZEN = 0) NBOOT0 BOOT0 pin NSWBOOT0 Boot address option-byte selection Boot area ST programmed default value - 0 1 ADD[24:0] in FLASH_BOOT0R Nonsecure boot base address 0 defined by user option bytes in FLASH_BOOT0R Flash: 0x0800 0000 - 1 1 ADD[24:0] in FLASH_BOOT1R Nonsecure boot base address 0 defined by user option bytes in FLASH_BOOT1R Bootloader: 0x0BF8 F000 1 - 0 ADD[24:0] in FLASH_BOOT0R Nonsecure boot base address 0 defined by user option bytes in FLASH_BOOT0R Flash: 0x0800 0000 0 - 0 ADD[24:0] in FLASH_BOOT1R Nonsecure boot base address 0 defined by user option bytes in FLASH_BOOT1R Bootloader: 0x0BF8 F000 When TrustZone® is enabled by setting the TZEN option bit, the boot space must be in the secure area. The ADD[24:0] option bytes in FLASH_SBOOT0R register option bytes are used to select the boot secure memory address. A unique boot entry option can be selected by setting the BOOT_LOCK option bit, allowing to boot always at the secure base boot address selected by user option bytes. All other boot options are ignored. Table 5. Boot modes when TrustZone® is enabled (TZEN = 1) BOOT_ LOCK NBOOT0 BOOT0 pin NSWBOOT0 RSS command Boot address option- byte selection Boot area ST programmed default value 0 - 0 1 0 ADD[24:0] in FLASH_SBOOT0R Secure boot base address 0 defined by user option bytes in FLASH_SBOOT0R Flash: 0x0C00 0000 - 1 1 0 N/A RSS RSS: 0x0FF8 0000 1 - 0 0 ADD[24:0] in FLASH_SBOOT0R Secure boot base address 0 defined by user option bytes in FLASH_SBOOT0R Flash: 0x0C00 0000 0 - 0 0 N/A RSS RSS: 0x0FF8 0000 - - - ≠0 N/A RSS RSS: 0x0FF8 0000 1 - - - - ADD[24:0] in FLASH_SBOOT0R Secure boot base address 0 defined by user option bytes in FLASH_SBOOT0R Flash: 0x0C00 0000 STM32U375xx Functional overview DS14861 - Rev 2 page 13/222 |
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