zephyr

History

Keith Packard 6c95f23d81 samples/code_relocation_nocopy: Increase fake flash size When linking with the 0.16.3 SDK version of picolibc, using long long cbprintf support pulls in the full floating point printf which is much larger than the integer-only version. This ends up overflowing the memory region available for it. Increase the size of that by bumping the start of the fake region by 8kB. Signed-off-by: Keith Packard <keithp@keithp.com>		2023-11-20 06:07:58 -05:00
..
boards	samples: code_relocation_nocopy: Use nrf_qspi_nor driver to init XIP	2023-09-13 16:20:34 +02:00
src	modules: cmsis: move glue code to modules/cmsis	2023-08-24 13:20:21 +02:00
CMakeLists.txt	samples: code_relocation_nocopy: Use nrf_qspi_nor driver to init XIP	2023-09-13 16:20:34 +02:00
linker_arm_nocopy.ld	samples/code_relocation_nocopy: Increase fake flash size	2023-11-20 06:07:58 -05:00
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	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