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F28M35h52c bootloader bank

sigefroid van Haelst
Prodigy 100 points

hello


I'm currently involved in a project aiming the development of a special motor controller.

Actually the the IC is ship with an embedded bootloader (for the M3 and C28x). But unfortunately because the bootloader of our device should work with an already define bootloader protocol and flash other satellite IC than the C28x we are not able to use the default bootloader.
So. is it possible to reuse the bootloader bank of the M3 in order to write my own bootloader or is it a true dead ROM memory ? 

if the this 64K bank is available to be  written how can i do that?
Siegfried van Haelst

  • 0
    TI__Mastermind 19810 points

    Van,

    the ROM code cannot be modified on the Silicon. On the TMS version of the silicon there is a boot-to-OTP mode and this boots to user code in OTP (the size available would be less than 2KB). This is explained in detail on the forum post : http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/312626.aspx and below is a snapshot of the user OTP map.

     

    F28M35x REVA 

    User OTP location Address

    REVA Usage

    Notes

    0x680800

    OTP Security LOCK

    Combined ECC

    0x680804

    Reserved

    0x680808

    Reserved

    Combined ECC

    0x68080C

    Z2 FLASH ENTRY POINT

    0x680810

    EMAC_REG0_ADDR

    Combined ECC

    0x680814

    EMAC_REG1_ADDR

    0x680818

    Reserved

    Combined ECC

    0x68081C

    MAIN_OSC_CLK_FREQ

    0x680820

    Reserved

    Combined ECC

    0x680824

    Alternate Boot mode Pin Config

    0x680828

    Reserved

    Combined ECC

    0x68082C

    OTP_ENTRY_POINT

     

    other than this, users can use the boot-to-flash option and put custom boot loaders in flash. There could be a custom ROM Mask option possible but depends on the business side of it, so you have to get in touch with the Marketing team or your local FAE to see if custom mask ROM is possible or not.

     

    see if you can fit your custom loader in OTP and Flash and either use boot-to-otp or boot-to-flash best thing.

     

    Best Regards

    Santosh