zephyr

History

Huifeng Zhang 2c22e83dfb include: arch: arm: Remove aarch32 directory This commit follows the parent commit work. This commit introduces the following major changes. 1. Move all directories and files in 'include/zephyr/arch/arm/aarch32' to the 'include/zephyr/arch/arm' directory. 2. Change the path string which is influenced by the changement 1. Signed-off-by: Huifeng Zhang <Huifeng.Zhang@arm.com>		2023-09-13 10:08:05 +01:00
..
boards	init: remove the need for a dummy device pointer in SYS_INIT functions	2023-04-12 14:28:07 +00:00
src	modules: cmsis: move glue code to modules/cmsis	2023-08-24 13:20:21 +02:00
CMakeLists.txt
linker_arm_nocopy.ld	include: arch: arm: Remove aarch32 directory	2023-09-13 10:08:05 +01:00
prj.conf
README.rst
sample.yaml	samples, tests: convert string-based twister lists to YAML lists	2023-05-10 09:52:37 +02:00

README.rst

.. _code_relocation_nocopy:

Code relocation nocopy
######################

Overview
********
A simple example that demonstrates how relocation of code, data or bss sections
using a custom linker script.

Differently from the code relocation sample, this sample is relocating the
content of the ext_code.c file to a different FLASH section and the code is XIP
directly from there without the need to copy / relocate the code.

nRF5340 DK platform instructions
********************************

The nRF5340 DK has a 64 Mb external flash memory supporting Quad SPI. It is
possible to do XIP from the external flash memory.

The external flash memory is mapped to 0x10000000.

In this sample we relocate some of the code to the external flash memory with
the remaining Zephyr kernel in the internal flash.

To build and flash the application (including the external memory part):

.. zephyr-app-commands::
   :zephyr-app: samples/application_development/code_relocation_nocopy
   :board: nrf5340dk_nrf5340_cpuapp
   :goals: build flash
   :compact:

Execution output:

.. code-block:: console

  *** Booting Zephyr OS build v3.0.0-rc3-25-g0df32cec1ff2  ***
  Address of main function 0x4f9
  Address of function_in_ext_flash 0x10000001
  Address of var_ext_sram_data 0x200000a0 (10)
  Address of function_in_sram 0x20000001
  Address of var_sram_data 0x200000a4 (10)
  Hello World! nrf5340dk_nrf5340_cpuapp