MEMORY {
    BOOT_LOADER : ORIGIN = 0x10000000, LENGTH = 0x100
    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
    RAM   : ORIGIN = 0x20000000, LENGTH = 256K
}

SECTIONS {
    /* ### Boot loader */
    .boot_loader ORIGIN(BOOT_LOADER) :
    {
        KEEP(*(.boot_loader));
    } > BOOT_LOADER
} INSERT BEFORE .text;