AM2431: How can i do sbl image integrity check in my own code?

Qiao,Xue

Prodigy 240 points

Part Number: AM2431

Tool/software:

When start the sbl, the RBL will do the sbl's integrity check .

How can i do this check in my code?

is there something like checksum in the sbl image?

over 1 year ago

0 Prashant Shivhare over 1 year ago

TI__Guru* 79391 points

Hi,

Qiao,Xue said:
How can i do this check in my code?

There is no API available for checking the integrity of the SBL image. If really required, the ROM bootable image is signed with X.509 certificate which contains SHA512 hashes of the different components blobs. You may extract the SHA512 hashes from the certificate, compute the SHA512 hashes of the blobs, and accordingly compare them.

If this functionality is required for OTA secure update, you may implement a different approach as outlined in the following response:

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1389894/am2432-validating-secure-boot-sbl-image-with-without-booting/5323969#5323969

Regards,

Prashant

Arm-based microcontrollers

Arm-based microcontrollers forum

AM2431: How can i do sbl image integrity check in my own code?