Is it possible to change that APP start address ?

RE: Is it possible to change that APP start address ?

Vidar Berg — Mon, 15 Apr 2019 08:00:12 GMT

Hi,

Yes, it's possible, but you need to a custom bootloader to boot an application at a nondefault address. The default app start address (no bootloader present) is hardcoded in the Softdevice.

The Softdevice/MBR boot sequence is explained here:

- Master boot record and SoftDevice reset procedure

Another alternative could be to reserve flash pages for the library below FDS.

RE: Is it possible to change that APP start address ?

Fred — Fri, 12 Apr 2019 13:47:04 GMT

In your linker script (e.g. *.ld in your project), there is a section:

MEMORY

{

FLASH (rx) : ORIGIN = 0x23000, LENGTH = 0x5d000

RAM (rwx) : ORIGIN = 0x20002310, LENGTH = 0xDCF0

}

that defines where the application starts. In my case I use SoftDevice with some custom attributes and therefore my app starts at 0x20002310. A 'clean' app (no SoftDevice) would start at 0x20000000 and can have length 0x10000 (or 64KB).