DA1469x can't be flashed when application start address is 0x00008000

[kasjer]

Starting from version 1.0.25 external flash loader was dropped and Segger handles write to flash with built-in flash loader.

Unfortunately what's included in Segger does not allow to erase flash region that starts from 0x8000, instead it erases regions starting from 0.
In case where bootloader (MCUBoot) is small and resides in in first 32kB of flash (including product header) and application code is placed at 0x8000 writing bootloader erases beginning of the application and writing application erases bootloader.

This happens because Segger uses erase command that wipes 64kB of flash at a time instead of 4kB.
External flash loader that was still in 1.0.24 did not work that way.

This behavior prevents usage this tool (starting from 1.0.25) on mynewt OS where by default MCUboot code is small enough.

[ezflash]

@kasjer, I'm not sure what can be done about that. The change in 1.0.25 was there to fix issues seen on the device after programming some Zephyr applications.