nuttx/boards/xtensa/esp32s3/common/scripts/simple_boot_sections.ld

/****************************************************************************
 * boards/xtensa/esp32s3/common/scripts/mcuboot_sections.ld
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

#include <nuttx/config.h>

/* Default entry point: */

ENTRY(__start);

_diram_i_start = 0x40378000;

SECTIONS
{
  /* Send .iram0 code to iram */

  .iram0.vectors :
  {
    _iram_start = ABSOLUTE(.);

    /* Vectors go to IRAM. */

    _init_start = ABSOLUTE(.);

    /* Vectors according to builds/RF-2015.2-win32/esp108_v1_2_s5_512int_2/config.html */

    . = 0x0;
    KEEP (*(.window_vectors.text));
    . = 0x180;
    KEEP (*(.xtensa_level2_vector.text));
    . = 0x1c0;
    KEEP (*(.xtensa_level3_vector.text));
    . = 0x200;
    KEEP (*(.xtensa_level4_vector.text));
    . = 0x240;
    KEEP (*(.xtensa_level5_vector.text));
    . = 0x280;
    KEEP (*(.debug_exception_vector.text));
    . = 0x2c0;
    KEEP (*(.nmi_vector.text));
    . = 0x300;
    KEEP (*(.kernel_exception_vector.text));
    . = 0x340;
    KEEP (*(.user_exception_vector.text));
    . = 0x3c0;
    KEEP (*(.double_exception_vector.text));
    . = 0x400;
    *(.*_vector.literal)

    . = ALIGN(16);

    *(.entry.text)
    *(.init.literal)
    *(.init)
    _init_end = ABSOLUTE(.);
  } >iram0_0_seg AT>ROM

  .iram0.text :
  {
    /* Code marked as running out of IRAM */

    *(.iram1 .iram1.*)
    esp32s3_start.*(.literal .text .literal.* .text.*)

    *libarch.a:esp32s3_cpuindex.*(.literal .text .literal.* .text.*)
    *libarch.a:esp32s3_irq.*(.literal .text .literal.* .text.*)
    *libarch.a:esp32s3_user.*(.literal .text .literal.* .text.*)
    *libarch.a:esp32s3_spiflash.*(.literal .text .literal.* .text.*)
    *libarch.a:xtensa_assert.*(.literal .text .literal.* .text.*)
    *libarch.a:xtensa_cpuint.*(.literal .text .literal.* .text.*)
    *libarch.a:xtensa_cpupause.*(.literal .text .literal.* .text.*)
    *libarch.a:xtensa_irqdispatch.*(.literal .text .literal.* .text.*)
    *libarch.a:xtensa_modifyreg32.*(.literal .text .literal.* .text.*)
    *libarch.a:xtensa_testset.*(.literal .text .literal.* .text.*)

#ifdef CONFIG_ESP32S3_BLE
    *libc.a:sq_remlast.*(.literal .text .literal.* .text.*)
#endif

    *libdrivers.a:syslog_flush.*(.literal .text .literal.* .text.*)

    *libsched.a:assert.*(.literal .text .literal.* .text.*)
    *libsched.a:irq_csection.*(.literal .text .literal.* .text.*)
    *libsched.a:irq_dispatch.*(.literal .text .literal.* .text.*)
    *libsched.a:irq_spinlock.*(.literal .text .literal.* .text.*)
    *libsched.a:sched_note.*(.literal .text .literal.* .text.*)
    *libsched.a:sched_suspendscheduler.*(.literal .text .literal.* .text.*)
    *libsched.a:sched_thistask.*(.literal .text .literal.* .text.*)
    *libsched.a:spinlock.*(.literal .text .literal.* .text.*)
    *libsched.a:*sched_get_stackinfo.*(.literal .text .literal.* .text.*)

#ifdef CONFIG_ESP32S3_SPEED_UP_ISR
    *libarch.a:xtensa_switchcontext.*(.literal.up_switch_context .text.up_switch_context)

    *libarch.a:esp32s3_timerisr.*(.literal.systimer_isr .text.systimer_isr)
    *libarch.a:esp32s3_idle.*(.literal.up_idle .text.up_idle)
    *libarch.a:esp32s3_dma.*(.literal.esp32s3_dma_load .text.esp32s3_dma_load \
                             .literal.esp32s3_dma_enable .text.esp32s3_dma_enable)

    *libsched.a:sched_processtimer.*(.literal.nxsched_process_timer .text.nxsched_process_timer)
    *libsched.a:clock_initialize.*(.literal.clock_timer .text.clock_timer)
    *libsched.a:wd_start.*(.literal.wd_timer .text.wd_timer)
    *libsched.a:sched_roundrobin.*(.literal.nxsched_process_roundrobin .text.nxsched_process_roundrobin)
    *libsched.a:sched_reprioritizertr.*(.literal.nxsched_reprioritize_rtr .text.nxsched_reprioritize_rtr)
    *libsched.a:sched_removereadytorun.*(.literal.nxsched_remove_readytorun .text.nxsched_remove_readytorun)
    *libsched.a:sched_addreadytorun.*(.literal.nxsched_add_readytorun .text.nxsched_add_readytorun)
    *libsched.a:sched_addprioritized.*(.literal.nxsched_add_prioritized .text.nxsched_add_prioritized)
    *libsched.a:sched_mergepending.*(.literal.nxsched_merge_pending .text.nxsched_merge_pending)
    *libsched.a:sched_resumescheduler.*(.literal.nxsched_resume_scheduler .text.nxsched_resume_scheduler)

    *libc.a:sq_remfirst.*(.literal.sq_remfirst .text.sq_remfirst)
#endif

    *libarch.a:esp32s3_spi_timing.*(.literal .text .literal.* .text.*)
#ifdef CONFIG_ESP32S3_SPIRAM_MODE_QUAD
    *libarch.a:esp32s3_psram_quad.*(.literal .text .literal.* .text.*)
#endif
#ifdef CONFIG_ESP32S3_SPIRAM_MODE_OCT
    *libarch.a:esp32s3_psram_octal.*(.literal .text .literal.* .text.*)
#endif
#if defined(CONFIG_STACK_CANARIES) && \
    (defined(CONFIG_ESP32S3_SPIFLASH) || \
     defined(CONFIG_ESP32S3_SPIRAM))
    *libc.a:lib_stackchk.*(.literal .text .literal.* .text.*)
#endif

    *libarch.a:*brownout_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*cpu.*(.text .text.* .literal .literal.*)
    *libarch.a:*gpio_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*periph_ctrl.*(.text .text.* .literal .literal.*)
    *libarch.a:*clk.*(.text .text.* .literal .literal.*)
    *libarch.a:*efuse_hal.*(.literal.is_eco0 .text.is_eco0)
    *libarch.a:*esp_clk.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_clk_tree.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_clk_tree_common.*(.text .text.* .literal .literal.*)
    *libarch.a:*clk_tree_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*rtc_init.*(.text .text.* .literal .literal.*)
    *libarch.a:*rtc_clk.*(.text .text.* .literal .literal.*)
    *libarch.a:*rtc_clk_init.*(.text .text.* .literal .literal.*)
    *libarch.a:*rtc_sleep.*(.text .text.* .literal .literal.*)
    *libarch.a:*rtc_time.*(.text .text.* .literal .literal.*)
    *libarch.a:*regi2c_ctrl.*(.text .text.* .literal .literal.*)
    *libarch.a:*uart_hal_iram.*(.text .text.* .literal .literal.*)
    *libarch.a:*wdt_hal_iram.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_banner_wrap.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_init.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_common.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_common_loader.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_console.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_console_loader.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_esp32s3.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_flash.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_flash_config_esp32s3.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_clock_init.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_clock_loader.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_efuse.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_panic.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_mem.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_random.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_random*.*(.literal.bootloader_random_disable .text.bootloader_random_disable)
    *libarch.a:*bootloader_random*.*(.literal.bootloader_random_enable .text.bootloader_random_enable)
    *libarch.a:*bootloader_random_esp32s3.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_image_format.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_soc.*(.text .text.* .literal .literal.*)
    *libarch.a:*bootloader_sha.*(.text .text.* .literal .literal.*)
    *libarch.a:*flash_encrypt.*(.text .text.* .literal .literal.*)
    *libarch.a:*cache_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*uart_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*mpu_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*mmu_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*efuse_hal.*(.text .text.* .literal .literal.*)
    *libarch.a:*uart_periph.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_rom_uart.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_rom_sys.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_rom_spiflash.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_rom_cache_esp32s2_esp32s3.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_rom_wdt.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_efuse_fields.*(.text .text.* .literal .literal.*)
    *libarch.a:*esp_efuse_api_key.*(.text .text.* .literal .literal.*)
    *libarch.a:*log.*(.text .text.* .literal .literal.*)
    *libarch.a:*log_noos.*(.text .text.* .literal .literal.*)
    *libarch.a:*cpu_region_protect.*(.text .text.* .literal .literal.*)
    *libarch.a:*mspi_timing_tuning.*(.text .text.* .literal .literal.*)

    *libc.a:*lib_instrument.*(.text .text.* .literal .literal.*)

    *(.wifirxiram .wifirxiram.*)
    *(.wifi0iram  .wifi0iram.*)
    *(.wifiorslpiram .wifiorslpiram.*)
    *(.wifislpiram .wifislpiram.*)
    *(.wifislprxiram .wifislprxiram.*)
    *(.phyiram .phyiram.*)

    /* align + add 16B for CPU dummy speculative instr. fetch */

    . = ALIGN(4) + 16;

    _iram_text = ABSOLUTE(.);
  } >iram0_0_seg AT > ROM

  .dram0.dummy (NOLOAD) :
  {
    /* This section is required to skip .iram0.text area because iram0_0_seg
     * and dram0_0_seg reflect the same address space on different buses.
     */

    . = ORIGIN(dram0_0_seg) + MAX(_iram_end, _diram_i_start) - _diram_i_start;
  } >dram0_0_seg

  /* Shared RAM */

  .dram0.bss (NOLOAD) :
  {
    /* .bss initialized on power-up */

    . = ALIGN(8);
    _bss_start = ABSOLUTE(.);
    _sbss = ABSOLUTE(.);

    *(.bss .bss.*)
    *(COMMON)
    *(.dynsbss)
    *(.sbss)
    *(.sbss.*)
    *(.gnu.linkonce.sb.*)
    *(.scommon)
    *(.sbss2)
    *(.sbss2.*)
    *(.gnu.linkonce.sb2.*)
    *(.dynbss)
    *(.share.mem)
    *(.gnu.linkonce.b.*)

    . = ALIGN(8);
    _ebss = ABSOLUTE(.);
    _bss_end = ABSOLUTE(.);
  } >dram0_0_seg

  .noinit (NOLOAD) :
  {
    /* This section contains data that is not initialized during load,
     * or during the application's initialization sequence.
     */

    . = ALIGN(4);

    *(.noinit .noinit.*)

    . = ALIGN(4);
  } >dram0_0_seg

  .dram0.data :
  {
    /* .data initialized on power-up in ROMed configurations. */
    . = ALIGN (16);
    _data_start = ABSOLUTE(.);
    _sdata = ABSOLUTE(.);
    KEEP (*(.data))
    KEEP (*(.data.*))
    KEEP (*(.gnu.linkonce.d.*))
    KEEP (*(.data1))
    KEEP (*(.sdata))
    KEEP (*(.sdata.*))
    KEEP (*(.gnu.linkonce.s.*))
    KEEP (*(.sdata2))
    KEEP (*(.sdata2.*))
    KEEP (*(.gnu.linkonce.s2.*))
    KEEP (*(.jcr))
    *(.dram1 .dram1.*)
    esp32s3_start.*(.rodata .rodata.*)

    *libphy.a:(.rodata  .rodata.*)
    *libarch.a:xtensa_context.*(.rodata  .rodata.*)
#if defined(CONFIG_STACK_CANARIES) && \
    (defined(CONFIG_ESP32S3_SPIFLASH) || \
     defined(CONFIG_ESP32S3_SPIRAM))
    *libc.a:lib_stackchk.*(.rodata  .rodata.*)
#endif

    *libsched.a:*sched_get_stackinfo.*(.rodata .rodata.*)
    *libarch.a:esp32s3_spiflash.*(.rodata .rodata.*)
    *libarch.a:*brownout.*(.rodata .rodata.*)
    *libarch.a:*cpu.*(.rodata .rodata.*)
    *libarch.a:*gpio_hal.*(.rodata .rodata.*)
    *libarch.a:*periph_ctrl.*(.rodata .rodata.*)
    *libarch.a:*clk.*(.rodata .rodata.*)
    *libarch.a:*esp_clk.*(.rodata .rodata.*)
    *libarch.a:*esp_clk_tree.*(.rodata .rodata.*)
    *libarch.a:*esp_clk_tree_common.*(.rodata .rodata.*)
    *libarch.a:*clk_tree_hal.*(.rodata .rodata.*)
    *libarch.a:*rtc_init.*(.rodata .rodata.*)
    *libarch.a:*rtc_clk.*(.rodata .rodata.*)
    *libarch.a:*rtc_clk_init.*(.rodata .rodata.*)
    *libarch.a:*rtc_sleep.*(.rodata .rodata.*)
    *libarch.a:*rtc_time.*(.rodata .rodata.*)
    *libarch.a:*regi2c_ctrl.*(.rodata .rodata.*)
    *libarch.a:*uart_hal_iram.*(.rodata .rodata.*)
    *libarch.a:*wdt_hal_iram.*(.rodata .rodata.*)
    *libarch.a:*bootloader_banner_wrap.*(.rodata .rodata.*)
    *libarch.a:*bootloader_init.*(.rodata .rodata.*)
    *libarch.a:*bootloader_common.*(.rodata .rodata.*)
    *libarch.a:*bootloader_common_loader.*(.rodata .rodata.*)
    *libarch.a:*bootloader_console.*(.rodata .rodata.*)
    *libarch.a:*bootloader_console_loader.*(.rodata .rodata.*)
    *libarch.a:*bootloader_esp32s3.*(.rodata .rodata.*)
    *libarch.a:*bootloader_flash.*(.rodata .rodata.*)
    *libarch.a:*bootloader_flash_config_esp32s3.*(.rodata .rodata.*)
    *libarch.a:*bootloader_clock_init.*(.rodata .rodata.*)
    *libarch.a:*bootloader_clock_loader.*(.rodata .rodata.*)
    *libarch.a:*bootloader_efuse.*(.rodata .rodata.*)
    *libarch.a:*bootloader_panic.*(.rodata .rodata.*)
    *libarch.a:*bootloader_mem.*(.rodata .rodata.*)
    *libarch.a:*bootloader_random.*(.rodata .rodata.*)
    *libarch.a:*bootloader_random_esp32s3.*(.rodata .rodata.*)
    *libarch.a:*esp_image_format.*(.rodata .rodata.*)
    *libarch.a:*bootloader_soc.*(.rodata .rodata.*)
    *libarch.a:*bootloader_sha.*(.rodata .rodata.*)
    *libarch.a:*flash_encrypt.*(.rodata .rodata.*)
    *libarch.a:*cache_hal.*(.rodata .rodata.*)
    *libarch.a:*uart_hal.*(.rodata .rodata.*)
    *libarch.a:*mpu_hal.*(.rodata .rodata.*)
    *libarch.a:*mmu_hal.*(.rodata .rodata.*)
    *libarch.a:*uart_periph.*(.rodata .rodata.*)
    *libarch.a:*esp_rom_uart.*(.rodata .rodata.*)
    *libarch.a:*esp_rom_sys.*(.rodata .rodata.*)
    *libarch.a:*esp_rom_spiflash.*(.rodata .rodata.*)
    *libarch.a:*esp_rom_cache_esp32s2_esp32s3.*(.rodata .rodata.*)
    *libarch.a:*esp_rom_wdt.*(.rodata .rodata.*)
    *libarch.a:*esp_efuse_fields.*(.rodata .rodata.*)
    *libarch.a:*esp_efuse_api_key.*(.rodata .rodata.*)
    *libarch.a:*log.*(.rodata .rodata.*)
    *libarch.a:*log_noos.*(.rodata .rodata.*)
    *libarch.a:*cpu_region_protect.*(.rodata .rodata.*)
    *libarch.a:*mspi_timing_tuning.*(.rodata .rodata.*)
#ifdef CONFIG_ESP32S3_SPIRAM_MODE_QUAD
    *libarch.a:esp32s3_psram_quad.*(.rodata .rodata.*)
#endif
#ifdef CONFIG_ESP32S3_SPIRAM_MODE_OCT
    *libarch.a:esp32s3_psram_octal.*(.rodata .rodata.*)
#endif

    . = ALIGN(4);
    _edata = ABSOLUTE(.);
    _data_end = ABSOLUTE(.);

    /* Heap starts at the end of .data */

    _sheap = ABSOLUTE(.);
  } >dram0_0_seg AT>ROM

  _image_drom_vma = ADDR(.flash.rodata);
  _image_drom_lma = LOADADDR(.flash.rodata);
  _image_drom_size = LOADADDR(.flash.rodata) + SIZEOF(.flash.rodata) - _image_drom_lma;

  /* The alignment of the ".flash.rodata" output section is forced to
   * 0x00010000 (64KB) to ensure that it will be allocated at the beginning
   * of the next available Flash block.
   * This is required to meet the following constraint from the external
   * flash MMU:
   *    VMA % 64KB == LMA % 64KB
   * i.e. the lower 16 bits of both the virtual address (address seen by the
   * CPU) and the load address (physical address of the external flash) must
   * be equal.
   */

  .flash.rodata_dummy (NOLOAD) :
  {
    . = ALIGN(0x10000);
  } > ROM

  .flash.rodata :
  {
    _rodata_reserved_start = ABSOLUTE(.);

    _srodata = ABSOLUTE(.);
    *(EXCLUDE_FILE (esp32s3_start.*) .rodata)
    *(EXCLUDE_FILE (esp32s3_start.*) .rodata.*)

    *(.rodata)
    *(.rodata.*)
#ifdef CONFIG_ESP32S3_WIRELESS
    *(.rodata_wlog_verbose.*)
    *(.rodata_wlog_debug.*)
    *(.rodata_wlog_info.*)
    *(.rodata_wlog_warning.*)
    *(.rodata_wlog_error.*)
#endif
    *(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
    *(.gnu.linkonce.r.*)
    *(.rodata1)
    __XT_EXCEPTION_TABLE_ = ABSOLUTE(.);
    *(.xt_except_table)
    *(.gcc_except_table)
    *(.gcc_except_table.*)
    *(.gnu.linkonce.e.*)
    *(.gnu.version_r)
    *(.eh_frame)

    . = ALIGN(4);

    /* C++ constructor and destructor tables, properly ordered: */

    _sinit = ABSOLUTE(.);
    KEEP (*crtbegin.o(.ctors))
    KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
    KEEP (*(SORT(.ctors.*)))
    KEEP (*(.ctors))
    _einit = ABSOLUTE(.);
    KEEP (*crtbegin.o(.dtors))
    KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
    KEEP (*(SORT(.dtors.*)))
    KEEP (*(.dtors))

    /* C++ exception handlers table: */

    __XT_EXCEPTION_DESCS_ = ABSOLUTE(.);
    *(.xt_except_desc)
    *(.gnu.linkonce.h.*)
    __XT_EXCEPTION_DESCS_END__ = ABSOLUTE(.);
    *(.xt_except_desc_end)
    *(.dynamic)
    *(.gnu.version_d)
    _erodata = ABSOLUTE(.);

    /* Literals are also RO data. */

    _lit4_start = ABSOLUTE(.);
    *(*.lit4)
    *(.lit4.*)
    *(.gnu.linkonce.lit4.*)
    _lit4_end = ABSOLUTE(.);
    . = ALIGN(4);
  } >drom0_0_seg AT>ROM

  .flash.rodata_noload (NOLOAD) :
  {
    /*
      This is a symbol marking the flash.rodata end, this can be
      used for mmu driver to maintain virtual address
      We don't need to include the noload rodata in this section
    */
    _rodata_reserved_end = ABSOLUTE(.);
    . = ALIGN (4);
    mapping[rodata_noload]
  } >drom0_0_seg

  _image_irom_vma = ADDR(.flash.text);
  _image_irom_lma = LOADADDR(.flash.text);
  _image_irom_size = LOADADDR(.flash.text) + SIZEOF(.flash.text) - _image_irom_lma;

  .flash.text_dummy (NOLOAD) :
  {
    . += SIZEOF(.flash.rodata);
    . = ALIGN(0x10000);
  } >default_code_seg AT> ROM

  .flash.text :
  {
    _stext = .;
    _instruction_reserved_start = ABSOLUTE(.);

    *(.literal .text .literal.* .text.* .stub .gnu.warning .gnu.linkonce.literal.* .gnu.linkonce.t.*.literal .gnu.linkonce.t.*)
    *(.irom0.text) /* catch stray ICACHE_RODATA_ATTR */
    *(.fini.literal)
    *(.fini)
    *(.gnu.version)

    /* CPU will try to prefetch up to 16 bytes of instructions.
     * This means that any configuration (e.g. MMU, PMS) must allow
     * safe access to up to 16 bytes after the last real instruction, add
     * dummy bytes to ensure this
     */

    . += 16;

    _instruction_reserved_end = ABSOLUTE(.);
    _etext = .;
  } >irom0_0_seg AT>ROM

  /* Marks the end of IRAM code segment */

  .iram0.text_end (NOLOAD) :
  {
    /* ESP32-S3 memprot requires 16B padding for possible CPU prefetch and
     * 256B alignment for PMS split lines.
     */

    . += 16;
    . = ALIGN(256);
    _iram_end = ABSOLUTE(.);
  } >iram0_0_seg

  .iram0.data :
  {
    . = ALIGN(4);

    *(.iram.data)
    *(.iram.data.*)
  } >iram0_0_seg

  .iram0.bss (NOLOAD) :
  {
    . = ALIGN(4);

    *(.iram.bss)
    *(.iram.bss.*)

    . = ALIGN(4);
    _iram_end = ABSOLUTE(.);
  } >iram0_0_seg

  .rtc.text :
  {
    . = ALIGN(4);
    *(.rtc.literal .rtc.text)
  } >rtc_iram_seg AT>ROM

  /* RTC BSS section. */

  .rtc.bss (NOLOAD) :
  {
    *(.rtc.bss)
  } >rtc_slow_seg

  .rtc.data :
  {
    . = ALIGN(4);
    *(.rtc.data)
    *(.rtc.data.*)
    *(.rtc.rodata)
    *(.rtc.rodata.*)

    /* Whatever is left from the RTC memory is used as a special heap. */

    . = ALIGN (4);
    _srtcheap = ABSOLUTE(.);
  } >rtc_slow_seg

  /*
   * This section holds RTC data that should have fixed addresses.
   * The data are not initialized at power-up and are retained during deep sleep.
   */
  .rtc_reserved (NOLOAD):
  {
    . = ALIGN(4);
    _rtc_reserved_start = ABSOLUTE(.);
    /* New data can only be added here to ensure existing data are not moved.
       Because data have adhered to the end of the segment and code is relied on it.
       >> put new data here << */

    *(.rtc_timer_data_in_rtc_mem .rtc_timer_data_in_rtc_mem.*)
    KEEP(*(.bootloader_data_rtc_mem .bootloader_data_rtc_mem.*))
    _rtc_reserved_end = ABSOLUTE(.);
  } > rtc_reserved_seg

}