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nuttx/boards/xtensa/esp32/common/scripts/simple_boot_sections.ld
Almir Okato 593dc946d1 esp32: add simple boot support 
The Simple Boot feature for Espressif chips is a method of booting
that doesn't depend on a 2nd stage bootloader. Its not the
intention to replace a 2nd stage bootloader such as MCUboot and
ESP-IDF bootloader, but to have a minimal and straight-forward way
of booting, and also simplify the building.

This commit also removes deprecated code and makes this bootloader
configuration as default for esp32 targets and removes the need
for running 'make bootloader' command for it.

Signed-off-by: Almir Okato <almir.okato@espressif.com>
2024-07-04 18:22:24 -03:00

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/****************************************************************************
* boards/xtensa/esp32/common/scripts/simple_boot_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);
SECTIONS
{
/* Send .iram0 code to iram */
.iram0.vectors :
{
/* 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 : ALIGN(4)
{
/* Code marked as running out of IRAM */
_iram_text_start = ABSOLUTE(.);
*(.iram1 .iram1.*)
esp32_start.*(.literal .text .literal.* .text.*)
*libphy.a:(.literal .text .literal.* .text.*)
*librtc.a:(.literal .text .literal.* .text.*)
*libpp.a:(.literal .text .literal.* .text.*)
*libhal.a:(.literal .text .literal.* .text.*)
*libarch.a:*esp_loader.*(.literal .text .literal.* .text.*)
*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.*(.text .text.* .literal .literal.*)
*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_clk.*(.text .text.* .literal .literal.*)
*libarch.a:*rtc_clk_init.*(.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_esp32.*(.text .text.* .literal .literal.*)
*libarch.a:*bootloader_flash.*(.text .text.* .literal .literal.*)
*libarch.a:*bootloader_flash_config_esp32.*(.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_esp32.*(.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:*uart_hal.*(.text .text.* .literal .literal.*)
*libarch.a:*mpu_hal.*(.text .text.* .literal .literal.*)
*libarch.a:*mmu_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_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.*)
#ifdef CONFIG_STACK_CANARIES
*libc.a:lib_stackchk.*(.literal .text .literal.* .text.*)
#endif
*libarch.a:esp32_cpuindex.*(.literal .text .literal.* .text.*)
*libarch.a:esp32_irq.*(.literal .text .literal.* .text.*)
*libarch.a:esp32_spicache.*(.literal .text .literal.* .text.*)
*libarch.a:esp32_spiflash.*(.literal .text .literal.* .text.*)
*libarch.a:esp32_user.*(.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_saveusercontext.*(.literal .text .literal.* .text.*)
*libarch.a:xtensa_testset.*(.literal .text .literal.* .text.*)
*libc.a:lib_assert.*(.literal .text .literal.* .text.*)
*libc.a:lib_utsname.*(.literal .text .literal.* .text.*)
#ifdef CONFIG_ESP32_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:panic_notifier.*(.literal.panic_notifier_call_chain .text.panic_notifier_call_chain)
*libsched.a:sched_gettcb.*(.literal .text .literal.* .text.*)
*libsched.a:sched_lock.*(.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:sched_unlock.*(.literal .text .literal.* .text.*)
*libsched.a:spinlock.*(.literal .text .literal.* .text.*)
*(.wifirxiram .wifirxiram.*)
*(.wifi0iram .wifi0iram.*)
*(.wifiorslpiram .wifiorslpiram.*)
*(.wifislpiram .wifislpiram.*)
*(.wifislprxiram .wifislprxiram.*)
*(.phyiram .phyiram.*)
. = ALIGN(4) + 16;
_iram_text_end = ABSOLUTE(.);
/* IRAM heap starts at the end of iram0_0_seg */
. = ALIGN (4);
_siramheap = ABSOLUTE(.);
} >iram0_0_seg AT>ROM
/* Shared RAM */
.noinit (NOLOAD):
{
/* This section contains data that is not initialized during load,
* or during the application's initialization sequence.
*/
. = ALIGN(8);
*(.noinit)
*(.noinit.*)
. = ALIGN(8);
} >dram0_0_seg
.dram0.bss (NOLOAD) :
{
/* .bss initialized on power-up */
. = ALIGN (8);
_bss_start = ABSOLUTE(.);
_sbss = ABSOLUTE(.);
*(EXCLUDE_FILE(*libble_app.a *libbt.a *libbtdm_app.a *libnimble.a) .bss EXCLUDE_FILE(*libble_app.a *libbt.a *libbtdm_app.a *libnimble.a) .bss.*)
*(.ext_ram.bss*)
*(EXCLUDE_FILE(*libble_app.a *libbt.a *libbtdm_app.a *libnimble.a) COMMON)
. = ALIGN(4);
_bt_controller_bss_start = ABSOLUTE(.);
*libble_app.a:(.bss .bss.*)
. = ALIGN(4);
_bt_controller_bss_end = ABSOLUTE(.);
. = ALIGN(4);
_bt_controller_common_start = ABSOLUTE(.);
*libble_app.a:(COMMON)
. = ALIGN(4);
_bt_controller_common_end = ABSOLUTE(.);
. = ALIGN(4);
_bt_bss_start = ABSOLUTE(.);
*libbt.a:(.bss .bss.*)
. = ALIGN(4);
_bt_bss_end = ABSOLUTE(.);
. = ALIGN(4);
_bt_common_start = ABSOLUTE(.);
*libbt.a:(COMMON)
. = ALIGN(4);
_bt_common_end = ABSOLUTE(.);
. = ALIGN(4);
_btdm_bss_start = ABSOLUTE(.);
*libbtdm_app.a:(.bss .bss.*)
. = ALIGN(4);
_btdm_bss_end = ABSOLUTE(.);
. = ALIGN(4);
_btdm_common_start = ABSOLUTE(.);
*libbtdm_app.a:(COMMON)
. = ALIGN(4);
_btdm_common_end = ABSOLUTE(.);
. = ALIGN (8);
*(.dynsbss)
*(.sbss)
*(.sbss.*)
*(.gnu.linkonce.sb.*)
*(.scommon)
*(.sbss2)
*(.sbss2.*)
*(.gnu.linkonce.sb2.*)
*(.dynbss)
KEEP (*(.bss))
*(.bss.*)
*(.share.mem)
*(.gnu.linkonce.b.*)
*(COMMON)
#ifdef CONFIG_STACK_CANARIES
*libc.a:lib_stackchk.*(.bss .bss.* COMMON)
#endif
*libarch.a:esp32_spicache.*(.bss .bss.* COMMON)
*libarch.a:esp32_spiflash.*(.bss .bss.* COMMON)
*libarch.a:xtensa_cpupause.*(.bss .bss.* COMMON)
*libarch.a:xtensa_copystate.*(.bss .bss.* COMMON)
*libarch.a:xtensa_interruptcontext.*(.bss .bss.* COMMON)
*libarch.a:xtensa_testset.*(.bss .bss.* COMMON)
*libsched.a:sched_suspendscheduler.*(.bss .bss.* COMMON)
*libsched.a:sched_thistask.*(.bss .bss.* COMMON)
*libsched.a:sched_note.*(.bss .bss.* COMMON)
*libsched.a:spinlock.*(.bss .bss.* COMMON)
*libsched.a:irq_csection.*(.bss .bss.* COMMON)
*libsched.a:irq_dispatch.*(.bss .bss.* COMMON)
. = ALIGN(8);
_ebss = ABSOLUTE(.);
_bss_end = ABSOLUTE(.);
} >dram0_0_seg
.dram0.data :
{
/* .data initialized on power-up in ROMed configurations. */
_sdata = ABSOLUTE(.);
_data_start = ABSOLUTE(.);
_bt_data_start = ABSOLUTE(.);
*libbt.a:(.data .data.*)
. = ALIGN (4);
_bt_data_end = ABSOLUTE(.);
_btdm_data_start = ABSOLUTE(.);
*libbtdm_app.a:(.data .data.*)
. = ALIGN (4);
_btdm_data_end = 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.*)
esp32_start.*(.rodata .rodata.*)
*libphy.a:(.rodata .rodata.*)
#ifdef CONFIG_STACK_CANARIES
*libc.a:lib_stackchk.*(.rodata .rodata.*)
#endif
*libarch.a:xtensa_context.*(.rodata .rodata.*)
*libarch.a:xtensa_copystate.*(.rodata .rodata.*)
*libarch.a:xtensa_cpupause.*(.rodata .rodata.*)
*libarch.a:xtensa_testset.*(.rodata .rodata.*)
*libdrivers.a:syslog_channel.*(.rodata .rodata.*)
*libsched.a:sched_suspendscheduler.*(.rodata .rodata.*)
*libsched.a:sched_thistask.*(.rodata .rodata.*)
*libsched.a:sched_note.*(.rodata .rodata.*)
*libsched.a:spinlock.*(.rodata .rodata.*)
*libsched.a:irq_csection.*(.rodata .rodata.*)
*libsched.a:irq_dispatch.*(.rodata .rodata.*)
*libarch.a:esp32_spicache.*(.rodata .rodata.*)
*libarch.a:esp32_spiflash.*(.rodata .rodata.*)
*libarch.a:*esp_loader.*(.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_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_esp32.*(.rodata .rodata.*)
*libarch.a:*bootloader_flash.*(.rodata .rodata.*)
*libarch.a:*bootloader_flash_config_esp32.*(.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_esp32.*(.rodata .rodata.*)
*libarch.a:*esp_image_format.*(.rodata .rodata.*)
*libarch.a:*bootloader_soc.*(.rodata .rodata.*)
*libarch.a:*bootloader_sha.*(.rodata .rodata.*)
*libarch.a:*uart_hal.*(.rodata .rodata.*)
*libarch.a:*mpu_hal.*(.rodata .rodata.*)
*libarch.a:*mmu_hal.*(.rodata .rodata.*)
*libarch.a:*efuse_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_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.*)
_edata = ABSOLUTE(.);
_data_end = ABSOLUTE(.);
. = ALIGN(4);
/* 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 :
{
. = ALIGN(4);
_srodata = ABSOLUTE(.);
*(EXCLUDE_FILE (*libarch.a:esp32_spiflash.* *libarch.a:esp32_spicache.*
*libarch.a:esp_loader.* esp32_start.*) .rodata)
*(EXCLUDE_FILE (*libarch.a:esp32_spiflash.* *libarch.a:esp32_spicache.*
*libarch.a:esp_loader.* esp32_start.*) .rodata.*)
*(.srodata.*)
*(.rodata)
*(.rodata.*)
#ifdef CONFIG_ESP32_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)
. = (. + 3) & ~ 3;
/* 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)
/* Addresses of memory regions reserved via SOC_RESERVE_MEMORY_REGION() */
soc_reserved_memory_region_start = ABSOLUTE(.);
KEEP (*(.reserved_memory_address))
soc_reserved_memory_region_end = ABSOLUTE(.);
. = ALIGN(4); /* This table MUST be 4-byte aligned */
_erodata = ABSOLUTE(.);
/* Literals are also RO data. */
_lit4_start = ABSOLUTE(.);
*(*.lit4)
*(.lit4.*)
*(.gnu.linkonce.lit4.*)
_lit4_end = ABSOLUTE(.);
. = ALIGN(4);
} >default_rodata_seg AT>ROM
_image_irom_vma = ADDR(.flash.text);
_image_irom_lma = LOADADDR(.flash.text);
_image_irom_size = LOADADDR(.flash.text) + SIZEOF(.flash.text) - _image_irom_lma;
/* The alignment of the ".flash.text" 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.text_dummy (NOLOAD) :
{
. += SIZEOF(.flash.rodata);
. = ALIGN(0x10000);
} >default_code_seg AT> ROM
.flash.text :
{
_stext = .;
_text_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)
. = ALIGN(4);
. += 16;
_text_end = ABSOLUTE(.);
_etext = .;
} >default_code_seg AT>ROM
/* External memory bss, from any global variable with EXT_RAM_ATTR attribute */
.extmem.bss (NOLOAD) :
{
_sbss_extmem = ABSOLUTE(.);
*(.extmem.bss .extmem.bss.*)
. = ALIGN(4);
_ebss_extmem = ABSOLUTE(.);
} >extmem_seg
.rtc.text :
{
. = ALIGN(4);
*(.rtc.literal .rtc.text)
} >rtc_iram_seg AT>ROM
.rtc.data :
{
*(.rtc.data)
*(.rtc.rodata)
/* Whatever is left from the RTC memory is used as a special heap. */
. = ALIGN (4);
_srtcheap = ABSOLUTE(.);
} >rtc_slow_seg AT>ROM
}
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