RE: Memory layout

bjorn-spockeli — Thu, 16 May 2019 07:46:45 GMT

Happy to help :)

RE: Memory layout

rtscts — Wed, 15 May 2019 23:22:36 GMT

Thanks, it really makes sense to place bootloader on the opposite side from the SD.

RE: Memory layout

bjorn-spockeli — Wed, 15 May 2019 12:02:17 GMT

It is possible, but I do not see the reason for changing the memory map as shown above, since the whole point for the bootloader being placed at the end of flash is to make it possible to update to a new version of the SoftDevice that is larger than the one that is currently present. By placing the BL after the SD you cannot update to SD that is larger than BL Start Address-SD Start address(0x1000).

It is only the bootloader start address that is stored in UICR, the SoftDevice expects the application to be located immediately its end address. Or to be more exact, after passing execution to the SD it will initialize it self and then jump to the end address and expects to find the vector table of an application/bootloader at that location.

Best regards

Bjørn