168 lines
6.4 KiB
Plaintext
168 lines
6.4 KiB
Plaintext
/****************************************************************************
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* boards/xtensa/esp32/common/scripts/esp32.template.ld
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* ESP32 Linker Script Memory Layout
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*
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* This file describes the memory layout (memory blocks) as virtual
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* memory addresses.
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*
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* esp32.ld contains output sections to link compiler output into these
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* memory blocks.
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*
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* NOTE: That this is not the actual linker script but rather a "template"
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* for the esp32_out.ld script. This template script is passed through
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* the C preprocessor to include selected configuration options.
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*
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_ESP32_FLASH_2M
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# define FLASH_SIZE 0x200000
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#elif defined (CONFIG_ESP32_FLASH_4M)
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# define FLASH_SIZE 0x400000
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#elif defined (CONFIG_ESP32_FLASH_8M)
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# define FLASH_SIZE 0x800000
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#elif defined (CONFIG_ESP32_FLASH_16M)
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# define FLASH_SIZE 0x1000000
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#endif
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MEMORY
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{
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#ifdef CONFIG_ESP32_APP_FORMAT_MCUBOOT
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/* The origin values for "metadata" and "ROM" memory regions are the actual
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* load addresses.
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*
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* NOTE: The memory region starting from 0x0 with length represented by
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* CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE is reserved for the MCUboot header,
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* which will be prepended to the binary file by the "imgtool" during the
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* signing of firmware image.
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*/
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metadata (RX) : org = CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE, len = 0x20
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ROM (RX) : org = CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20,
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len = FLASH_SIZE - (CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20)
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#endif
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/* Below values assume the flash cache is on, and have the blocks this
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* uses subtracted from the length of the various regions. The 'data access
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* port' dram/drom regions map to the same iram/irom regions but are
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* connected to the data port of the CPU and e.g. allow bytewise access.
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*/
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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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/* Flash mapped instruction data. */
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#ifdef CONFIG_ESP32_APP_FORMAT_MCUBOOT
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irom0_0_seg (RX) : org = 0x400d0000, len = 0x330000
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#else
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/* The 0x20 offset 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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irom0_0_seg (RX) : org = 0x400d0020, len = 0x330000 - 0x20
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#endif
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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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*
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* Note: The length of this section should be 0x50000, and this extra
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* DRAM is available in heap at runtime. However due to static ROM memory
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* usage at this 176KB mark, the additional static memory temporarily cannot
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* be used.
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*/
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dram0_0_seg (RW) : org = 0x3ffb0000 + CONFIG_ESP32_BT_RESERVE_DRAM,
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len = 0x2c200 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM - CONFIG_ESP32_BT_RESERVE_DRAM
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/* Flash mapped constant data */
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#ifdef CONFIG_ESP32_APP_FORMAT_MCUBOOT
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/* The DROM segment origin is offset by 0x40 for mirroring the actual ROM
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* image layout:
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* 0x0 - 0x1F : MCUboot header
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* 0x20 - 0x3F : Application image metadata section
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* 0x40 onwards: ROM code and data
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* This is required to meet the following constraint from the external
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* flash MMU:
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* VMA % 64KB == LMA % 64KB
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* i.e. the lower 16 bits of both the virtual address (address seen by the
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* CPU) and the load address (physical address of the external flash) must
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* be equal.
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*/
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drom0_0_seg (R) : org = 0x3f400000 + (CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20),
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len = FLASH_SIZE - (CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE + 0x20)
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#else
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/* The 0x20 offset 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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drom0_0_seg (R) : org = 0x3f400020, len = FLASH_SIZE - 0x20
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#endif
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/* RTC fast memory (executable). Persists over deep sleep. */
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rtc_iram_seg (RWX) : org = 0x400c0000, len = 0x2000
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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,
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* 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 = 0x1000 - CONFIG_ESP32_ULP_COPROC_RESERVE_MEM
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/* External memory, including data and text */
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extmem_seg (RWX) : org = 0x3f800000, len = 0x400000
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}
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#if CONFIG_ESP32_DEVKIT_RUN_IRAM
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REGION_ALIAS("default_rodata_seg", dram0_0_seg);
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REGION_ALIAS("default_code_seg", iram0_0_seg);
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#else
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REGION_ALIAS("default_rodata_seg", drom0_0_seg);
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REGION_ALIAS("default_code_seg", irom0_0_seg);
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#endif /* CONFIG_ESP32_DEVKIT_RUN_IRAM */
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/* Heap ends at top of dram0_0_seg */
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_eheap = 0x40000000 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM;
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/* IRAM heap ends at top of dram0_0_seg */
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_eiramheap = 0x400a0000;
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/* Mark the end of the RTC heap (top of the RTC region) */
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_ertcheap = 0x50001fff;
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