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What do i need to start at the BSL on reset?

TI Lady
Genius 4025 points
Other Parts Discussed in Thread: MSP430F6725

 I'd like to ask about the MSP430F6725 chip. Can you please clarify the ways that the device can jump into the BSL sector? Specifically, what do we need to do to start at the BSL on reset? Also, is there a way to programmatically enter the BSL?

thank you so much.

  • 0
    TI__Mastermind 20945 points

    Hi TI Lady,

    Please take a look at the MSP430 BSL User's Guide, it contains all the information you need.  In short, there is a hardware entry sequence that forces BSL entry, using the TEST and RESET pins.  Also, you can enter the BSL from your application on F5xx/6xx devices by jumping to address 0x1000.

    Mike

  • 0
    Guru 58965 points
    I can only tell you my understanding about this.

    There are many causes of System Reset. If it is caused by powering up the device, power supply "BrownOut", or software generated "BrownOut Reset", it is called a BOR (BrownOut Reset).

    Aside from BOR, there are many other causes of System Reset. This include nRST input, Watchdog Timeout, Watchdog Password violation, Flash controller password key violation, other kinds of software generated Reset, etc.

    What happens after these two kinds of System Reset are very different. For none-BOR System Reset, the contends of the System Reset Vector (@ 0xFFFE) will be loaded into the PC. This is probably what you are used to.

    For BOR System Reset, however, the address of a mysterious BootROM will be loaded into the PC instead. The code there will do some mysterious set-up including calling a routine inside the protected area of Flash memory (if it exists). After that, depends on what was returned, it will either jump to the location pointed @0xFFFE, or the BSL starting point.

    The TI factory programmed protected area of Flash is such that if the BSL entry sequence was detected, the BootROM will be directed to jump to the BSL starting point. And if not, the BootROM will be directed to jump to the @0xFFFE.

    To do what you want, you need simply change that to always jump to BSL starting point.

    Please verify that what I said are correct before you try to do it.
  • 0 in reply to Mike Pridgen
    Guru 58965 points

    After I reviewed the response from , I realized that I need to amend my previous response.

    The hardware entry sequence using the TEST and RESET pins will also trigger a BOR. In addition, it will set the SYSBSLIND bit inside the SYSCTL register where as other BOR that I mentioned earlier will clear that bit. However, this will not directly force a BSL.

    The TI factory programmed Flash memory has a routine somewhat like this:

    BSL_Protect:
        MOV.W   #0, R12 ;default to invoke user reset
        BIS     #SYSBSLPE+SYSBSLSIZE0+SYSBSLSIZE1, &SYSBSLC
        bit     #SYSBSLIND, &SYSCTL
        jz      BCC2BSL
        BIS.W   #2,R12  ;change to invoke BSL instead
BCC2BSL
        RETA

    It is this routine that indirectly made BSL entry sequence causes BSL.

    Had you modified this routine, you could make BOR always causes BSL (as TI Lady wishes) 

    BSL_Protect:
        BIS     #SYSBSLPE+SYSBSLSIZE0+SYSBSLSIZE1, &SYSBSLC
        MOV.W   #2,R12  invoke BSL no mater what
        RETA

  • 0 in reply to old_cow_yellow
    TI__Mastermind 20945 points
    Hi TI Lady,

    Did old_cow_yellow and I answer your questions? If so, I will close the thread, if not, please let us know so we can help.

    Mike

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