MEMORY {
    FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 16K
    RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 2K
}

SECTIONS {
    .text : {
        *(.text.boot)
        *(.text*)
        *(.vector_table)
    } > FLASH

    /* Calculate positions from end of RAM */
    .data ORIGIN(RAM) + LENGTH(RAM) - SIZEOF(.data) : {
        _data_start = .;
        *(.data*)
        *(.sdata*)
        . = ALIGN(4);
        _data_end = .;
    } > RAM AT > FLASH

    /* BSS comes before data */
    .bss (_data_start - SIZEOF(.bss) - SIZEOF(.sbss)) : {
        _bss_start = .;
        *(.bss*)
        *(.sbss*)
        *(COMMON)
        . = ALIGN(4);
        _bss_end = .;
    } > RAM

    /* Stack starts at the bottom of BSS */
    _stack_top = _bss_start;
    _stack_bottom = ORIGIN(RAM);

    /* Critical symbols for initialization */
    _data_load = LOADADDR(.data);
}