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samples: code relocation for the stm32f746 disco kit #86136

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samples: code relocation for the stm32f746 disco kit #86136

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boards: st: stm32f746g_disco with external flash for code execution
FRASTM Feb 21, 2025
2f00108
samples: code relocation for the stm32f746 disco kit
FRASTM Feb 21, 2025
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2 changes: 2 additions & 0 deletions boards/st/stm32f746g_disco/board.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@

# keep first
board_runner_args(stm32cubeprogrammer "--port=swd" "--reset-mode=hw")
board_runner_args(stm32cubeprogrammer "--extload=N25Q128A_STM32F746G-DISCO.stldr")

board_runner_args(jlink "--device=STM32F746NG" "--speed=4000")

# keep first
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9 changes: 9 additions & 0 deletions boards/st/stm32f746g_disco/stm32f746g_disco.dts
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Expand Up @@ -57,6 +57,15 @@
zephyr,memory-attr = <( DT_MEM_ARM(ATTR_MPU_RAM) )>;
};

/* Declare attributes for the External flash Mem to allow code execution there */
ext_memory: memory@90000000 {
compatible = "zephyr,memory-region";
reg = <0x90000000 DT_SIZE_M(16)>; /* max addressable area */
zephyr,memory-region = "EXTMEM";
/* The ATTR_MPU_EXTMEM attribut causing a MPU FAULT */
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Do we need this comment? ATTR_MPU_EXTMEM is expected to cause MPU faults:

zephyr/include/zephyr/arch/arm/mpu/arm_mpu_v7m.h

Line 133 in ad845fd

#define REGION_EXTMEM_ATTR(size) {(STRONGLY_ORDERED_SHAREABLE | size | NO_ACCESS_Msk)}

(Emphasis mine: | NO_ACCESS_Msk)

zephyr,memory-attr = <( DT_MEM_ARM(ATTR_MPU_IO) )>;
};

aliases {
led0 = &green_led_1;
sw0 = &user_button;
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2 changes: 2 additions & 0 deletions samples/application_development/code_relocation_nocopy/boards/stm32f746g_disco.conf
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@@ -0,0 +1,2 @@
CONFIG_FLASH=y
CONFIG_STM32_MEMMAP=y
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