47 lines
1.6 KiB
ReStructuredText
47 lines
1.6 KiB
ReStructuredText
.. _code_relocation_nocopy:
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Code relocation nocopy
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######################
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Overview
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********
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A simple example that demonstrates how relocation of code, data or bss sections
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using a custom linker script.
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Differently from the code relocation sample, this sample is relocating the
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content of the ext_code.c file to a different FLASH section and the code is XIP
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directly from there without the need to copy / relocate the code.
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nRF5340dk platform instructions
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*******************************
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The nRF5340 PDK has a 64 Mb external flash memory supporting Quad SPI. It is
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possible to do XIP from the external flash memory.
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The external flash memory is mapped to 0x10000000.
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In this sample we relocate some of the code to the external flash memory with
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the remaining Zephyr kernel in the internal flash.
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Compile the code:
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$ west build -b nrf5340dk_nrf5340_cpuapp samples/application_development/code_relocation_nocopy --pristine
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Get the HEX file from the ELF:
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$ arm-linux-gnueabihf-objcopy -O ihex build/zephyr/zephyr.elf zephyr.hex
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Erase the external FLASH (just to be sure):
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$ nrfjprog --qspicustominit --qspieraseall
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Write the HEX to internal and external FLASH:
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$ nrfjprog --coprocessor CP_APPLICATION --sectorerase --qspisectorerase --program zephyr.hex
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Execution output:
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*** Booting Zephyr OS build v3.0.0-rc3-25-g0df32cec1ff2 ***
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Address of main function 0x4f9
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Address of function_in_ext_flash 0x10000001
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Address of var_ext_sram_data 0x200000a0 (10)
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Address of function_in_sram 0x20000001
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Address of var_sram_data 0x200000a4 (10)
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Hello World! nrf5340dk_nrf5340_cpuapp
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