# How to boot from external flash memory
## Following are the steps after creating a new project
1. If you are here, means you have already enabled the MEMORY MAPPED MODE.
2. Now you have to create a new project, which will boot from the external Flash.
3. Open the `system_stm32xxxx.c` file, goto System_Init, and add the following code to it.
`RCC->CFGR = 0; // Reset the configuration register`
`SCB->VTOR = QSPI_BASE; // 0x90000000`
4. Open the `Flash.ld` script file, and change the FLASH address to the QSPI FLASH. Also change the size
`FLASH (rx) : ORIGIN = 0x90000000, LENGTH = 16M`
5. In the Debug configuration, goto debugger tab, and towards the bottom check the `external loader`.
Click scan, select the board, and click apply
6. The Application will run from the External memory now.
## Check out the Respective files if you don't understand the steps. Also check the .ioc file for the MPU Configuration
## Check out the video https://youtu.be/gAyuF20ok8c
STM32-master.zip
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2024-03-02
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STM32-master.zip （160个子文件） 
stm32f4xx_hal_tim.c 245KB stm32f4xx_hal_rcc_ex.c 156KB tft.c 127KB stm32f4xx_hal_tim_ex.c 83KB stm32f4xx_hal_flash_ex.c 50KB stm32f4xx_hal_rcc.c 43KB stm32f4xx_hal_dma.c 40KB mt25tl01g.c 37KB main.c 29KB system_stm32f4xx.c 27KB quadspi.c 26KB stm32f4xx_hal_flash.c 24KB stm32f4xx_hal_pwr_ex.c 23KB stm32f4xx_hal_pwr.c 21KB stm32f4xx_hal.c 19KB stm32f4xx_hal_gpio.c 19KB quadspi.c 19KB stm32f4xx_hal_cortex.c 19KB stm32f4xx_hal_exti.c 15KB main.c 15KB system_stm32h7xx_dualcore_boot_cm4_cm7.c 13KB main.c 12KB BME280_STM32.c 11KB stm32f4xx_hal_dma_ex.c 11KB system_stm32f7xx.c 9KB uartRingBufDMA.c 9KB main.c 9KB main.c 8KB main.c 8KB ili9341.c 8KB I2C.c 7KB main.c 7KB FLASH_SECTOR_H7.c 7KB main.c 7KB FLASH_SECTOR_F4.c 7KB main.c 7KB main.c 7KB main.c 7KB main.c 6KB stm32f4xx_hal_flash_ramfunc.c 6KB stm32f4xx_it.c 6KB main.c 6KB main.c 6KB stm32f1xx_it.c 6KB EEPROM.c 6KB stm32f4xx_it.c 5KB main.c 5KB FlASH_PAGE_F1.c 5KB xpt2046.c 4KB RccConfig.c 3KB i2c-lcd.c 3KB sysmem.c 3KB syscalls.c 2KB lcd_lvgl.c 2KB Delay_F103.c 2KB stm32f4xx_hal_msp.c 2KB Delay.c 2KB TouchGFX_DataTransfer.c 742B main.c 261B STM32TouchController.cpp 2KB stm32f446xx.h 1.32MB stm32f4xx_hal_rcc_ex.h 430KB stm32_hal_legacy.h 210KB core_cm33.h 171KB core_armv8mml.h 165KB core_cm7.h 145KB core_cm4.h 121KB stm32f4xx_hal_tim.h 121KB core_cm3.h 109KB core_sc300.h 108KB core_cm23.h 102KB core_armv8mbl.h 96KB stm32f4xx_hal_gpio_ex.h 81KB stm32f4xx_hal_rcc.h 74KB stm32f4xx_hal_flash_ex.h 64KB cmsis_gcc.h 61KB cmsis_armclang.h 55KB core_cm0plus.h 49KB core_sc000.h 46KB core_cm1.h 42KB core_cm0.h 41KB stm32f4xx_hal_dma.h 38KB cmsis_iccarm.h 28KB cmsis_armcc.h 28KB lv_conf.h 21KB stm32f4xx_hal_conf.h 20KB stm32f4xx_hal_cortex.h 17KB stm32f4xx_hal_tim_ex.h 17KB mt25tl01g.h 16KB stm32f4xx_hal_pwr_ex.h 16KB stm32f4xx_hal_exti.h 15KB stm32f4xx_hal_flash.h 15KB stm32f4xx_hal_pwr.h 14KB stm32f4xx_hal_gpio.h 14KB stm32f4xx_hal.h 13KB stm32f4xx.h 12KB mpu_armv7.h 11KB mpu_armv8.h 11KB cmsis_compiler.h 9KB n25q128a.h 8KB共 160 条
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