system: add kconfig option for using parts of SRAM1 for IRAM

Using parts of SRAM1 for IRAM allows apps with more statically allocated IRAM

Closes https://github.com/espressif/esp-idf/issues/9824

components/esp_system/ld/esp32/memory.ld.in

@@ -48,6 +48,13 @@ ASSERT((CONFIG_ESP32_FIXED_STATIC_RAM_SIZE <= 0x2c200),
 #define DRAM0_0_SEG_LEN 0x2c200
 #endif
 
+#if CONFIG_ESP_SYSTEM_ESP32_SRAM1_REGION_AS_IRAM
+#define SRAM1_IRAM_LEN 0xA000
+#else
+#define SRAM1_IRAM_LEN 0x0
+#endif
+
+
 MEMORY
 {
   /* All these values assume the flash cache is on, and have the blocks this uses subtracted from the length
@@ -55,7 +62,7 @@ MEMORY
   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
+  iram0_0_seg (RX) :                 org = 0x40080000, len = 0x20000 + SRAM1_IRAM_LEN
 
 #ifdef CONFIG_APP_BUILD_USE_FLASH_SECTIONS
   /* Even though the segment name is iram, it is actually mapped to flash
@@ -121,8 +128,14 @@ _heap_start = 0x3FFB0000 + DRAM0_0_SEG_LEN;
 _heap_start = _heap_low_start;
 #endif
 
-/* Heap ends at top of dram0_0_seg */
+_sram1_iram_start = 0x400A0000;
+_sram1_iram_len = ( _iram_end > _sram1_iram_start) ? (_iram_end - _sram1_iram_start) : 0;
+_heap_end = ALIGN(0x40000000 - _sram1_iram_len - 3, 4);
+
+#if CONFIG_ESP32_TRACEMEM_RESERVE_DRAM != 0
 _heap_end = 0x40000000 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM;
+#endif
+
 
 _data_seg_org = ORIGIN(rtc_data_seg);