micropython/ports/stm32/mboot/stm32_memory.ld

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/*
Linker script fragment for mboot on an STM32xxx MCU.
This defines the memory sections for the bootloader to use.
*/
MEMORY
{
FLASH_BL (rx) : ORIGIN = 0x08000000, LENGTH = 32K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 120K
}
/* Location from which mboot is allowed to write to flash.
Must be the start of a flash erase sector. */
_mboot_writable_flash_start = ORIGIN(FLASH_BL) + LENGTH(FLASH_BL);