zephyr

History

Daniel DeGrasse 47271ce8be treewide: update usage of zephyr_code_relocate Update usage of zephyr_code_relocate to follow new API. The old method of relocating a file was the following directive: zephyr_code_relocate(file location) The new API for zephyr_code_relocate uses the following directive: zephyr_code_relocate(FILES file LOCATION location) update in tree usage to follow this model. Also, update the NXP HAL SHA, as NXP's HAL uses this macro as well. Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>		2023-01-17 18:08:37 +01:00
..
boards	samples: code_relocation_nocopy: Fix initialization of external memory	2022-06-24 20:29:00 +02:00
src	includes: prefer <zephyr/kernel.h> over <zephyr/zephyr.h>	2022-09-05 16:31:47 +02:00
CMakeLists.txt	treewide: update usage of zephyr_code_relocate	2023-01-17 18:08:37 +01:00
linker_arm_nocopy.ld
prj.conf	samples: code_relocation_nocopy: Disable gap filling	2022-06-24 20:29:00 +02:00
README.rst	samples: code_relocation_nocopy: Update documentation	2022-06-24 20:29:00 +02:00
sample.yaml	yamllint: indentation: fix files in samples/	2023-01-04 14:23:53 +01:00

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