mirror of
https://github.com/espressif/esp-idf.git
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151 lines
5.3 KiB
Plaintext
151 lines
5.3 KiB
Plaintext
/*
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* SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* ESP32 Linker Script Memory Layout
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This file describes the memory layout (memory blocks) as virtual
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memory addresses.
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esp32.project.ld contains output sections to link compiler output
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into these memory blocks.
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***
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This linker script is passed through the C preprocessor to include
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configuration options.
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Please use preprocessor features sparingly! Restrict
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to simple macros with numeric values, and/or #if/#endif blocks.
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*/
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#include "sdkconfig.h"
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/* If BT is not built at all */
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#ifndef CONFIG_BT_RESERVE_DRAM
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#define CONFIG_BT_RESERVE_DRAM 0
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#endif
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#ifdef CONFIG_BOOTLOADER_CUSTOM_RESERVE_RTC
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#define ESP_BOOTLOADER_RESERVE_RTC (CONFIG_BOOTLOADER_RESERVE_RTC_SIZE + CONFIG_BOOTLOADER_CUSTOM_RESERVE_RTC_SIZE)
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#elif defined(CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP)
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#define ESP_BOOTLOADER_RESERVE_RTC (CONFIG_BOOTLOADER_RESERVE_RTC_SIZE)
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#else
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#define ESP_BOOTLOADER_RESERVE_RTC 0
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#endif
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#if defined(CONFIG_ESP32_USE_FIXED_STATIC_RAM_SIZE)
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ASSERT((CONFIG_ESP32_FIXED_STATIC_RAM_SIZE <= 0x2c200),
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"Fixed static ram data does not fit.")
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#define DRAM0_0_SEG_LEN CONFIG_ESP32_FIXED_STATIC_RAM_SIZE
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#else
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#define DRAM0_0_SEG_LEN 0x2c200
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#endif
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MEMORY
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{
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/* All these values assume the flash cache is on, and have the blocks this uses subtracted from the length
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of the various regions. The 'data access port' dram/drom regions map to the same iram/irom regions but
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are connected to the data port of the CPU and eg allow bytewise access. */
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/* IRAM for PRO cpu. Not sure if happy with this, this is MMU area... */
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iram0_0_seg (RX) : org = 0x40080000, len = 0x20000
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#ifdef CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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/* Even though the segment name is iram, it is actually mapped to flash
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*/
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iram0_2_seg (RX) : org = 0x400D0020, len = 0x330000-0x20
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/*
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(0x20 offset above is a convenience for the app binary image generation.
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Flash cache has 64KB pages. The .bin file which is flashed to the chip
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has a 0x18 byte file header, and each segment has a 0x08 byte segment
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header. Setting this offset makes it simple to meet the flash cache MMU's
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constraint that (paddr % 64KB == vaddr % 64KB).)
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*/
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#endif // CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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/* Shared data RAM, excluding memory reserved for ROM bss/data/stack.
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Enabling Bluetooth & Trace Memory features in menuconfig will decrease
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the amount of RAM available.
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Note: Length of this section *should* be 0x50000, and this extra DRAM is available
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in heap at runtime. However due to static ROM memory usage at this 176KB mark, the
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additional static memory temporarily cannot be used.
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*/
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dram0_0_seg (RW) : org = 0x3FFB0000 + CONFIG_BT_RESERVE_DRAM,
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len = DRAM0_0_SEG_LEN - CONFIG_BT_RESERVE_DRAM
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#ifdef CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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/* Flash mapped constant data */
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drom0_0_seg (R) : org = 0x3F400020, len = 0x400000-0x20
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/* (See iram0_2_seg for meaning of 0x20 offset in the above.) */
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#endif // CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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/* RTC fast memory (executable). Persists over deep sleep.
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*/
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rtc_iram_seg(RWX) : org = 0x400C0000, len = 0x2000
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/* RTC fast memory (same block as above), viewed from data bus */
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rtc_data_seg(RW) : org = 0x3ff80000, len = 0x2000 - ESP_BOOTLOADER_RESERVE_RTC
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/* RTC slow memory (data accessible). Persists over deep sleep.
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Start of RTC slow memory is reserved for ULP co-processor code + data, if enabled.
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*/
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rtc_slow_seg(RW) : org = 0x50000000 + CONFIG_ESP32_ULP_COPROC_RESERVE_MEM,
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len = 0x2000 - CONFIG_ESP32_ULP_COPROC_RESERVE_MEM
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/* external memory */
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extern_ram_seg(RWX) : org = 0x3F800000,
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len = 0x400000
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}
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#if defined(CONFIG_ESP32_USE_FIXED_STATIC_RAM_SIZE)
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/* static data ends at defined address */
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_static_data_end = 0x3FFB0000 + DRAM0_0_SEG_LEN;
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#else
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_static_data_end = _bss_end;
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#endif
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/* Heap ends at top of dram0_0_seg */
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_heap_end = 0x40000000 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM;
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_data_seg_org = ORIGIN(rtc_data_seg);
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/* The lines below define location alias for .rtc.data section based on Kconfig option.
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When the option is not defined then use slow memory segment
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else the data will be placed in fast memory segment */
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#ifndef CONFIG_ESP32_RTCDATA_IN_FAST_MEM
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REGION_ALIAS("rtc_data_location", rtc_slow_seg );
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#else
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REGION_ALIAS("rtc_data_location", rtc_data_seg );
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#endif
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#ifdef CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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REGION_ALIAS("default_code_seg", iram0_2_seg);
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#else
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REGION_ALIAS("default_code_seg", iram0_0_seg);
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#endif // CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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#ifdef CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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REGION_ALIAS("default_rodata_seg", drom0_0_seg);
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#else
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REGION_ALIAS("default_rodata_seg", dram0_0_seg);
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#endif // CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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/**
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* If rodata default segment is placed in `drom0_0_seg`, then flash's first rodata section must
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* also be first in the segment.
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*/
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#ifdef CONFIG_APP_BUILD_USE_FLASH_SECTIONS
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ASSERT(_rodata_start == ORIGIN(default_rodata_seg),
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".flash.appdesc section must be placed at the beginning of the rodata segment.")
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#endif
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