esp-idf/components/esp32/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"
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
/* Even though the segment name is iram, it is actually mapped to flash */
iram0_2_seg (RX) : org = 0x400D0018, len = 0x330000
/* 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.
*/
dram0_0_seg (RW) : org = 0x3FFB0000 + CONFIG_BT_RESERVE_DRAM,
len = 0x50000 - CONFIG_TRACEMEM_RESERVE_DRAM - CONFIG_BT_RESERVE_DRAM
/* Flash mapped constant data */
drom0_0_seg (R) : org = 0x3F400010, len = 0x800000
/* 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;