SFI Option Bytes for STM32H753ZI (Nucleo-H753ZI)

[jho]

Hi everyone,

I have a question regarding SFI Option Bytes for the STM32H753ZI (Nucleo-H753ZI).

Question:
Which option bytes should I pick, since there are a lot of different combinations available:

1. Generated by TrustedPackageCreator:

FLASH_OPTSR_PRG,0x17DEBBF0
FLASH_PRAR_PRG1,0x0000000F
FLASH_PRAR_PRG2,0x0000000F
FLASH_SCAR_PRG1,0x81000200
FLASH_SCAR_PRG2,0x81000200
FLASH_WPSN_PRG1,0xFFFFFFFF
FLASH_WPSN_PRG2,0xFFFFFFFF
FLASH_BOOT7_PRG,0x08002400
RESERVED,0x24000810

2. STM32CubeExpansion_RSSe_V1.1.0\Option_Bytes_Template\STM32H7\OB_H742_H743_H753_H750_v3.1.0.csv:

FLASH_OPTSR_PRG,0x17DEBBF0
FLASH_PRAR_PRG1,0x0000000F
FLASH_PRAR_PRG2,0x0000000F
FLASH_SCAR_PRG1,0x81000200
FLASH_SCAR_PRG2,0x81000200
FLASH_WPSN_PRG1,0xFFFFFFFF
FLASH_WPSN_PRG2,0xFFFFFFFF
FLASH_BOOT7_PRG,0x1FF00800
RESERVED,0x1FF00800

3. x-cube-sfi-v1-5-0\STM32CubeExpansion_SFI_v1.5.0\Projects\NUCLEO-H753ZI\Applications\SFI\OEM_SecureRoom\OptionBytes\ob.csv:

FOPTSR_PRG,0x13DEAAF8
FPRAR_PRG_A,0x81000200
FPRAR_PRG_B,0x81000200
FSCAR_PRG_A,0x81000200
FSCAR_PRG_B,0x81000200
FWPSN_PRG_A,0x000000FF
FWPSN_PRG_B,0x000000FF
FBOOT7_PRG,0x1FF10800
FBOOT4_PRG,0x10000810

I am mostly concerned about the BOOT7 Add0 and Add1.

Best regards

[Jocelyn RICARD · Accepted solution]

Hello @jho ,

I created an internal case.

On first glance, I don't think 0xAA as final RDP is even possible.

Regarding boot addresses, I would put twice the same which should be the boot address of your firmware.

So, if firmware starts at 0x08000000, is makes FBOOT7_PRG,0x08000800

Best regards

Jocelyn

[jho]

Hello Jocelyn,

you are right.

RDP = 0xBB and BOOT_CM7_ADD0 = 0x08000000 worked for my standard application.

Best regards

jho

[Jocelyn RICARD]

Hello @jho ,

thank you for your feedback.

Anyway, this issue is under discussion internally. And the default option bytes values will probably be more consistant in next releases

Best regards

Jocelyn