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Original question:

CCS/LAUNCHXL-F28379D: Software doesn't run without debugger

TMS320F28377D: Configuring TMS320F28377D to default to boot from flash memory

Eric Havens
Prodigy 50 points
Part Number: TMS320F28377D
Other Parts Discussed in Thread: CONTROLSUITE

It escaped my forethought to ensure that the boot mode GPIO pins were connected to allow the device to boot from flash memory when power is reset. I have been using an emulator to program my device, but now I am realizing my mistake and cannot load the program independent of the emulator. I am currently reading the technical manuals about how the boot mode select pins are configurable and that the default boot mode can be changed by setting the right value of the BOOTDEF memory location. I wanted to receive confirmation that it is possible to configure the device to load from flash memory without redesigning my board. Trying to work the problem out myself through reviewing the bootROM example without ControlSuite, but any time saved through advice would be greatly appreciated.

  • 0
    Prodigy 50 points

    I have been able to find some alternative resources with helpful information. It seems like a zero pin boot loading is an option and I need to use the On-Chip Flash tool while debugging my device in order to set the right values for Z1-BOOTCTRL. This question in particular seems to be close to my answer:

    https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/906924/tms320f280041-zero-boot-mode-select-pin-setting-by-uniflash

    Within CSS, I see Z1-BOOTCTRL as an option, but not Z1OTP-GREPG1-3, so I am looking for something for specific to my device with the TRM. I do see Z1OTP_LINKPOINTER1-3 which seem equivalent but have different addresses so I am unsure.

    ETA: I finished reading section 4 of the TRM and I was only able to ascertain the ability to change the default GPIO that the MCU reads in order to select Get Mode and what Get Mode actually does. There doesn't appear to be information about how to ignore the GPIO entirely which is what I prefer. 

  • 0 in reply to Eric Havens
    TI__Guru* 87105 points

    Hi Eric,

    Our BootROM expert will review and get back to you in a day or two.

    Thanks and regards,
    Vamsi

  • +1 in reply to Vamsi Gudivada
    TI__Expert 3300 points

    Hello Eric,

    I am assuming here that you are using the default boot pins 84 and 72. It may be possible to ignore the selection provided there are a new set of GPIOs for the MCU to boot from, provided there are two GPIOs (numbered below 168) that are pulled high.

    Custom Boot flow selection based on TRM:

    Based on the above flow and register description, can you try the below steps? 

    1. Setup Z1-BOOTCTRL.OTP_KEY = 0x5A
    2. Select the GPIOs for BMPS0 and BMSP1 in the BOOTCTRL register. This should override your current GPIO selection. If your current GPIOs are already having the value 0x03, we can use these.
    3. Lastly setup the BMODE value in the BOOTCTRL register to 0x0B (Flash boot).

    The above values need to be programmed in the ZxOTP_BOOTCTRL Register.

    If this doesn't work, you may have to rework your hardware. 

    Regards,
    Kedar

  • 0 in reply to Kedar_Sirdeshpande
    Prodigy 50 points

    Yes, those tables were helpful in realizing that I still need to change a portion of my hardware to account for the fact that the default boot mode pins are neither connected nor accessible. I would prefer a solution that disregards any boot mode pin, but based on the TRM, my path forward is to sacrifice a GPIO.

    It is stated that a single GPIO can be referenced twice in order to limit the boot mode selection down to a single pin. In my case, the most accessible GPIO for me to connect to VDD through a resistor is GPIO98. Thus, if I program Z1-BOOTCTRL (Address 0x7801E) to 0x62620B5A, I would override the boot mode selection pins to a single GPIO, apply a voltage to that GPIO, and should expect the device to boot from flash. 

    Is this correct?

    ETA: Double checking, the GPIO selection is one greater than the desired GPIO, so the actual value for selecting GPIO98 is 0x63630B5A.

     

    Still would like further confirmation before applying this OTP change.

  • 0 in reply to Eric Havens
    TI__Expert 3300 points

    Hi Eric.

    This should work. I suppose you have a few boards to iterate in case we have issues, considering this is an OTP change.

    -Kedar

  • 0 in reply to Kedar_Sirdeshpande
    Prodigy 50 points

    This resolved my issue, thank you.