/**************************************************************************** * boards/xtensa/esp32/common/scripts/esp32.template.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. * ****************************************************************************/ /**************************************************************************** * ESP32 Linker Script Memory Layout * * This file describes the memory layout (memory blocks) as virtual * memory addresses. * * esp32.ld contains output sections to link compiler output into these * memory blocks. * * NOTE: That this is not the actual linker script but rather a "template" * for the esp32_out.ld script. This template script is passed through * the C preprocessor to include selected configuration options. * ****************************************************************************/ #include #ifdef CONFIG_ESP32_FLASH_2M # define FLASH_SIZE 0x200000 #elif defined (CONFIG_ESP32_FLASH_4M) # define FLASH_SIZE 0x400000 #elif defined (CONFIG_ESP32_FLASH_8M) # define FLASH_SIZE 0x800000 #elif defined (CONFIG_ESP32_FLASH_16M) # define FLASH_SIZE 0x1000000 #endif MEMORY { #ifdef CONFIG_ESP32_APP_FORMAT_MCUBOOT /* The origin values for "metadata" and "ROM" memory regions are the actual * load addresses. * * NOTE: The memory region starting from 0x0 with length represented by * CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE is reserved for the MCUboot header, * which will be prepended to the binary file by the "imgtool" during the * signing of firmware image. */ metadata (RX) : org = CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE, len = 0x20 ROM (RX) : org = CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20, len = FLASH_SIZE - (CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20) #endif /* Below values assume the flash cache is on, and have the blocks this * uses subtracted from the length of the various regions. The 'data access * port' dram/drom regions map to the same iram/irom regions but are * connected to the data port of the CPU and e.g. allow bytewise access. */ /* IRAM for PRO cpu. Not sure if happy with this, this is MMU area... */ iram0_0_seg (RX) : org = 0x40080000, len = 0x20000 /* Flash mapped instruction data. */ #ifdef CONFIG_ESP32_APP_FORMAT_MCUBOOT irom0_0_seg (RX) : org = 0x400d0000, len = 0x330000 #else /* The 0x20 offset is a convenience for the app binary image generation. * Flash cache has 64KB pages. The .bin file which is flashed to the chip * has a 0x18 byte file header, and each segment has a 0x08 byte segment * header. Setting this offset makes it simple to meet the flash cache MMU's * constraint that (paddr % 64KB == vaddr % 64KB). */ irom0_0_seg (RX) : org = 0x400d0020, len = 0x330000 - 0x20 #endif /* Shared data RAM, excluding memory reserved for ROM bss/data/stack. * Enabling Bluetooth & Trace Memory features in menuconfig will decrease * the amount of RAM available. * * Note: The length of this section should be 0x50000, and this extra * DRAM is available in heap at runtime. However due to static ROM memory * usage at this 176KB mark, the additional static memory temporarily cannot * be used. */ dram0_0_seg (RW) : org = 0x3ffb0000 + CONFIG_ESP32_BT_RESERVE_DRAM, len = 0x2c200 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM - CONFIG_ESP32_BT_RESERVE_DRAM /* Flash mapped constant data */ #ifdef CONFIG_ESP32_APP_FORMAT_MCUBOOT /* The DROM segment origin is offset by 0x40 for mirroring the actual ROM * image layout: * 0x0 - 0x1F : MCUboot header * 0x20 - 0x3F : Application image metadata section * 0x40 onwards: ROM code and data * 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. */ drom0_0_seg (R) : org = 0x3f400000 + (CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20), len = FLASH_SIZE - (CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20) #else /* The 0x20 offset is a convenience for the app binary image generation. * Flash cache has 64KB pages. The .bin file which is flashed to the chip * has a 0x18 byte file header, and each segment has a 0x08 byte segment * header. Setting this offset makes it simple to meet the flash cache MMU's * constraint that (paddr % 64KB == vaddr % 64KB). */ drom0_0_seg (R) : org = 0x3f400020, len = FLASH_SIZE - 0x20 #endif /* RTC fast memory (executable). Persists over deep sleep. */ rtc_iram_seg (RWX) : org = 0x400c0000, len = 0x2000 /* RTC slow memory (data accessible). Persists over deep sleep. * Start of RTC slow memory is reserved for ULP co-processor code + data, * if enabled. */ rtc_slow_seg (RW) : org = 0x50000000 + CONFIG_ESP32_ULP_COPROC_RESERVE_MEM, len = 0x1000 - CONFIG_ESP32_ULP_COPROC_RESERVE_MEM /* External memory, including data and text */ extmem_seg (RWX) : org = 0x3f800000, len = 0x400000 } #if CONFIG_ESP32_DEVKIT_RUN_IRAM REGION_ALIAS("default_rodata_seg", dram0_0_seg); REGION_ALIAS("default_code_seg", iram0_0_seg); #else REGION_ALIAS("default_rodata_seg", drom0_0_seg); REGION_ALIAS("default_code_seg", irom0_0_seg); #endif /* CONFIG_ESP32_DEVKIT_RUN_IRAM */ /* Heap ends at top of dram0_0_seg */ _eheap = 0x40000000 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM; /* IRAM heap ends at top of dram0_0_seg */ _eiramheap = 0x400a0000; /* Mark the end of the RTC heap (top of the RTC region) */ _ertcheap = 0x50001fff;