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STM32U595AI Datasheet(PDF) 31 Page - STMicroelectronics |
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STM32U595AI Datasheet(HTML) 31 Page - STMicroelectronics |
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31 / 377 page  DS13633 Rev 1 31/377 STM32U59xxx Functional overview 94 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 - 0 1 NSBOOTADD0[24:0] Boot address defined by user option bytes NSBOOTADD0[24:0] Flash: 0x0800 0000 - 1 1 NSBOOTADD1[24:0] Boot address defined by user option bytes NSBOOTADD1[24:0] Bootloader: 0x0BF9 0000 1 - 0 NSBOOTADD0[24:0] Boot address defined by user option bytes NSBOOTADD0[24:0] Flash: 0x0800 0000 0 - 0 NSBOOTADD1[24:0] Boot address defined by user option bytes NSBOOTADD1[24:0] Bootloader: 0x0BF9 0000 |
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