43393cf4d1
This saves time when waking up from deep sleep, but potentially decreases the security of the system. If the application able to modify itself (especially areas that are loaded into RAM) in flash while running without crashing or is modifies the cached bits of information about what was last booted from the bootloader, this could cause security issues if the user does a "deep sleep reset" since the full validation is skipped. Signed-off-by: Tim Nordell <tim.nordell@nimbelink.com>
117 lines
4.1 KiB
Plaintext
117 lines
4.1 KiB
Plaintext
/* 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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#if 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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/* 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 = 0x400D0018, len = 0x330000-0x18
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/*
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(0x18 offset above is a convenience for the app binary image generation. Flash cache has 64KB pages. The .bin file
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which is flashed to the chip has a 0x18 byte file header. Setting this offset makes it simple to meet the flash
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cache MMU's constraint that (paddr % 64KB == vaddr % 64KB).)
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*/
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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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/* Flash mapped constant data */
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drom0_0_seg (R) : org = 0x3F400018, len = 0x400000-0x18
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/* (See iram0_2_seg for meaning of 0x18 offset in the above.) */
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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 = 0x1000 - CONFIG_ESP32_ULP_COPROC_RESERVE_MEM
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/* external memory ,including data and text */
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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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