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BLE CC26x2 BIM SW

Hello TI Support ,

Am trying to use BIM Software without the OAD feature for secure boot use case , So I needed to know how the on-chip BIM software process the newly downloaded image by the Serial Bootloader .

For the BIM there is a Copy Step does this mean that if I use on-chip BIM I will be able to use half the BLE chip memory ?

  • Hi,

    The BIM directly copies the image in flash and do not use the bootloader.

    I would recommend to review the BIM documentition and this app note dealing with the serial bootloader (https://www.ti.com/lit/swra466).

    Best regards,

  • Hello Clement ,

    Thank you for your answers , 

    I have read an application note on secure boot implementation using BIM Software (SWRA651) , in this app note it explained that the BIM software could be used with Serial Bootloader  in section 3.2 "Firmware update from external source, such as ROM serial bootloader" , I wanted to confirm if this limits the Application size to the half of the available internal flash as the copying step has to be done for on chip BIM  ?

  • Hello,

    short answer: Yes, using the BIM will limit the application size to about the half of available internal flash.

    The BIM will be programmed to the last flash page, in the case of CC2642 this is 0x56000 - 0x57FFF, occupying 8kb.

    It is started at every boot and checks, if a newer, valid image is available. If yes, it will take care of executing this newer image.

    The available flash memory is not exactly (352 kb - 8 kb) / 2 = 172 kb, because the images have some overhead in form of header and entry information.

    For further information I recommend the links Clement provided in addition to the linker command file of any OAD enabled example, like cc13x2_cc26x2_app.cmd of the project zero. It contains the memory definitions for the images.

    Best regards,

    Werner Lummer