BOOT_ADD0 and BOOT_ADD1 are programmed with values 0xFFFF

[Harshavardhan]

Hi,

I am using an STM32F746IE controller and in some of them i don't see proper ST programmed values in address locations of BOOT_ADD0 (0x1FFF 0010) and BOOT_ADD1 (0x1FFF 0018). As per the reference manual i understand the ST programmed values in these locations should be 0xFF7F 0080 (ITCM-FLASH base address) for BOOT_ADD0 and 0xFFBF0040 (system memory bootloader address) for BOOT_ADD1, but in my board i am seeing 0xFFFF on both of these locations (attached image1), due to this i am not able to access the system memory bootloader to flash my application by turning BOOT0 pin high. Is there a reason why this would happen in some of the controllers? These are fairly new controllers and we haven't programmed any user code yet.

Image1

[FBL]

Hi @Harshavardhan 

BOOT_ADD option bytes can be programmed by the user. Would you be able to access your target through CubeProg and reconfigure them to default values?

[Harshavardhan]

Hi @FBL ,

I was able to change the BOOT_ADD option bytes with my code, but i wanted to understand why the ST programmed values are not correct in this case? As i have not tampered with the values they should have been in Default values itself. I checked if i can find anything in errata  but there is nothing mentioned about this issue there as well.

[FBL]

@Harshavardhan Would you please provide as in private message data code and version of the chip? I will reach you privately to check!