arduino-esp32/tools/sdk/ld/esp32.ld

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/* ESP32 Linker Script Memory Layout
This file describes the memory layout (memory blocks) as virtual
memory addresses.
esp32.common.ld contains output sections to link compiler output
into these memory blocks.
***
This linker script is passed through the C preprocessor to include
configuration options.
Please use preprocessor features sparingly! Restrict
to simple macros with numeric values, and/or #if/#endif blocks.
*/
#include "sdkconfig.h"
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/* If BT is not built at all */
#ifndef CONFIG_BT_RESERVE_DRAM
#define CONFIG_BT_RESERVE_DRAM 0
#endif
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MEMORY
{
/* All these 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 eg 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
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/* Even though the segment name is iram, it is actually mapped to flash
*/
iram0_2_seg (RX) : org = 0x400D0018, len = 0x330000-0x18
/*
(0x18 offset above 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. Setting this offset makes it simple to meet the flash
cache MMU's constraint that (paddr % 64KB == vaddr % 64KB).)
*/
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/* 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: 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.
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*/
dram0_0_seg (RW) : org = 0x3FFB0000 + CONFIG_BT_RESERVE_DRAM,
len = 0x2c200 - 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
/* (See iram0_2_seg for meaning of 0x18 offset in the above.) */
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/* 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_ULP_COPROC_RESERVE_MEM,
len = 0x1000 - CONFIG_ULP_COPROC_RESERVE_MEM
}
/* Heap ends at top of dram0_0_seg */
_heap_end = 0x40000000 - CONFIG_TRACEMEM_RESERVE_DRAM;