STM32U595AI datasheet(31/377 Pages) STMICROELECTRONICS

31 / 377 page

DS13633 Rev 1

31/377

STM32U59xxx

Functional overview

This feature allows 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 6 and Table 7 for boot modes when TrustZone is disabled and

enabled respectively.

When TrustZone is enabled by setting the TZEN option bit, the boot space must be in the

secure area. The SECBOOTADD0[24:0] 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 address selected by SECBOOTADD0[24:0] option bytes. All other boot

options are ignored.

Table 6. Boot modes when TrustZone is disabled (TZEN = 0)

nBOOT0

FLASH_

OPTR[27]

BOOT0

pin PH3

nSWBOOT0

FLASH_

OPTR[26]

Boot address

option-byte

selection

Boot area

ST programmed

default value

NSBOOTADD0[24:0]

Boot address defined by

user option bytes

NSBOOTADD0[24:0]

Flash: 0x0800 0000

NSBOOTADD1[24:0]

Boot address defined by

user option bytes

NSBOOTADD1[24:0]

Bootloader:

0x0BF9 0000

NSBOOTADD0[24:0]

Boot address defined by

user option bytes

NSBOOTADD0[24:0]

Flash: 0x0800 0000

NSBOOTADD1[24:0]

Boot address defined by

user option bytes

NSBOOTADD1[24:0]

Bootloader:

0x0BF9 0000

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