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Unlocking CSM Through SCI_Boot

Daniel Bland
Intellectual 465 points
Other Parts Discussed in Thread: CONTROLSUITE

Is unlocking the CSM through SCI_Boot possible?  I reduced my code to only be a call to CsmUnlock() with the correct values hard coded there.  I figured this would be small enough to run in M0 and M1.  I also used #pragma CODE_SECTION(CsmUnlock, "ramfuncs"); to make sure it would be there.  But this doesn't work, because I have to reset the device back into SCI_Boot to upload more code, which I assume gets rid of my unlock procedure.

So I tried just adding CsmUnlock to my normal code, at the point that FlashAPI document says (after setting the Flash_CPUScaleFactor).  This also doesn't work.

Before I investigate further, is unlocking through SCI_Boot even possible?  If so, does it stay unlocked if the XRS(reset) is pulled low and the device starts back up in SCI_Boot?  As in, once unlocked, does it need a power cycle to re-enable the security (like when you set the password).

  • 0
    TI__Mastermind 19810 points

    Daniel,

    which device is this for? Please take a look at boot ROM sources in ControlSuite. You will have to implement your own SCI_Boot_from_app function, this function

    1.> should get loaded using the ROM SCI_Boot boot mode and at the end of boot this function will be called.

    2.> this function once started should call CSM unlock and call back in to ROM functions (code flow will be similar to the ROM SCI_Boot function) .

    CSM unlock is possible by SCI_Boot, SCI_Boot doesn;t care which function you are loading in RAM - it loads it and starts it. Now after this funciton unlocks the device the device gets locked again at XRSn or any reset. So you should not pull XRSn - if you follow above approach you will not have to restart the device for SCI_Boot but hte application function that unlocks the device will call back in to ROM loaders to complete the SCI_Boot.

    I'm sure it is not as simple as I stated above, but you can try it out. Please let us know if it works for you.

    Best Regards

    Santosh

     

  • 0 in reply to Santosh Athuru
    Intellectual 465 points

    This is for a TMS320F2802x.

    Thanks for the reply.  I already have a program running from RAM through SCI_Boot doing a whole lot of stuff with the flash.  I thought adding the CsmUnlock stuff here would solve the issue, but apparently not.

    I'll look into your solution.  I'm sure it's possible, but I don't have time to try the CSM unlocking just now.  At least I know it can work in the future and know that any reset will cause it to re-lock.  If I ever implement it, I'll be sure to state how it went.