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Any flash read protection mechanism other than AJSM?

user4543780
Prodigy 10 points
Other Parts Discussed in Thread: TMS570LC4357

Hello,

I am studying the features of TMS570LC4357 to figure out all the possible methods for intellectual property protection. After going through several posts related to AJSM, I believe that is a good way to prevent flash content from reading back. I would like to know that are there any other way for code read back protection? e.g. flash read protection mode? 

Meanwhile, I am concerned about the 128 bit AJSM key because they must be stored somewhere on flash. Are there any way to illegally obtain the key?

  • 0
    TI__Guru**** 191886 points
    Hi,
    Once the debugger is successfully connected to the target (i.e. suppose knowing the right 128-bit key), there is no other protection preventing reading the flash.

    Once the MCU is protected by the AJSM, your own user code needs to make sure you don't provide a backdoor allowing the hackers to read the AJSM password. For example, if you have a bootloader that allows application download and update then you want to make sure you don't provide any method for illegal downloading hacker code to retrieve the password.
  • 0 in reply to Charles Tsai
    TI__Guru**** 191886 points
    Hi,
    Is your question answered? if your question is answered can you please click the 'Verify Answer' to close the thread? Thanks.