feat(psram): add psram noinit segment support on S2/S3/P4/C5

Closes #14253

components/esp_common/test/test_attr.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2017-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2017-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -15,6 +15,8 @@
 #endif
 #include "test_utils.h"
 
+#define ALIGN_UP(num, align)    (((num) + ((align) - 1)) & ~((align) - 1))
+
 extern int _rtc_noinit_start;
 extern int _rtc_noinit_end;
 extern int _rtc_data_start;
@@ -30,7 +32,6 @@ extern int _ext_ram_noinit_end;
 extern int _ext_ram_bss_start;
 extern int _ext_ram_bss_end;
 
-
 #if !TEMPORARY_DISABLED_FOR_TARGETS(ESP32C2)
 //IDF-5045
 //Variables for test: Attributes place variables into correct sections
@@ -95,7 +96,13 @@ static void write_spiram_and_reset(void)
     }
     printf("Flushing cache\n");
     // Flush the cache out to SPIRAM before resetting.
+#if CONFIG_IDF_TARGET_ESP32
     esp_psram_extram_writeback_cache();
+#else
+    uint32_t ext_noinit_size = sizeof(s_noinit_buffer);
+    extern int Cache_WriteBack_Addr(uint32_t addr, uint32_t size);
+    Cache_WriteBack_Addr((uint32_t)s_noinit_buffer, ext_noinit_size);
+#endif
 
     printf("Restarting\n");
     // Reset to test that noinit memory is left intact.

components/esp_psram/Kconfig.spiram.common

@@ -23,8 +23,8 @@ config SPIRAM_IGNORE_NOTFOUND
         ESP_WIFI_CACHE_TX_BUFFER_NUM and use static WiFi Tx buffer may cause potential memory exhaustion issues.
         Suggest disable SPIRAM_TRY_ALLOCATE_WIFI_LWIP.
         Suggest disable ESP_WIFI_AMSDU_TX_ENABLED.
-        Suggest disable ESP_WIFI_CACHE_TX_BUFFER_NUM, need clear CONFIG_FEATURE_CACHE_TX_BUF_BIT of
-        config->feature_caps.
+        Suggest disable ESP_WIFI_CACHE_TX_BUFFER_NUM,
+        need clear CONFIG_FEATURE_CACHE_TX_BUF_BIT of config->feature_caps.
         Suggest change ESP_WIFI_TX_BUFFER from static to dynamic. Also suggest to adjust some buffer numbers to the
         values used without PSRAM case. Such as, ESP_WIFI_STATIC_TX_BUFFER_NUM, ESP_WIFI_DYNAMIC_TX_BUFFER_NUM.
 
@@ -110,7 +110,7 @@ config SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
 config SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY
     bool "Allow .noinit segment placed in external memory"
     default n
-    depends on SPIRAM && IDF_TARGET_ESP32
+    depends on SPIRAM
     help
         If enabled, noinit variables can be placed in PSRAM using EXT_RAM_NOINIT_ATTR.
 

components/esp_system/ld/esp32s2/memory.ld.in

@@ -127,8 +127,7 @@ _data_seg_org = ORIGIN(rtc_data_seg);
 
 /* The lines below define location alias for .rtc.data section based on Kconfig option.
    When the option is not defined then use slow memory segment
-   else the data will be placed in fast memory segment
-   TODO: check whether the rtc_data_location is correct for esp32s2 - IDF-761 */
+   else the data will be placed in fast memory segment */
 #ifndef CONFIG_ESP32S2_RTCDATA_IN_FAST_MEM
 REGION_ALIAS("rtc_data_location", rtc_slow_seg );
 #else

components/esp_system/ld/esp32s2/sections.ld.in

@@ -247,7 +247,7 @@ SECTIONS
     _noinit_end = ABSOLUTE(.);
   } > dram0_0_seg
 
-   /* external memory bss, from any global variable with EXT_RAM_BSS_ATTR attribute*/
+  /* External Memory BSS. (Variables with EXT_RAM_BSS_ATTR attribute). */
   .ext_ram.bss (NOLOAD) :
   {
     _ext_ram_bss_start = ABSOLUTE(.);
@@ -258,6 +258,20 @@ SECTIONS
     _ext_ram_bss_end = ABSOLUTE(.);
   } > extern_ram_seg
 
+  /**
+   * This section holds data that won't be initialised when startup.
+   * This section locates in External RAM region.
+   */
+  .ext_ram_noinit (NOLOAD) :
+  {
+    _ext_ram_noinit_start = ABSOLUTE(.);
+
+    *(.ext_ram_noinit*)
+
+    . = ALIGN(4);
+    _ext_ram_noinit_end = ABSOLUTE(.);
+  } > extern_ram_seg
+
   /* Shared RAM */
   .dram0.bss (NOLOAD) :
   {

components/esp_system/ld/esp32s3/sections.ld.in

@@ -421,6 +421,20 @@ SECTIONS
     _ext_ram_bss_end = ABSOLUTE(.);
   } > extern_ram_seg
 
+  /**
+   * This section holds data that won't be initialised when startup.
+   * This section locates in External RAM region.
+   */
+  .ext_ram_noinit (NOLOAD) :
+  {
+    _ext_ram_noinit_start = ABSOLUTE(.);
+
+    *(.ext_ram_noinit*)
+
+    . = ALIGN(4);
+    _ext_ram_noinit_end = ABSOLUTE(.);
+  } > extern_ram_seg
+
   /* Marks the end of IRAM code segment */
   .iram0.text_end (NOLOAD) :
   {

docs/en/api-guides/external-ram.rst

@@ -44,8 +44,8 @@ ESP-IDF fully supports the use of external RAM in applications. Once the externa
     * :ref:`external_ram_config_memory_map`
     * :ref:`external_ram_config_capability_allocator`
     * :ref:`external_ram_config_malloc` (default)
-    :esp32 or esp32s2: * :ref:`external_ram_config_bss`
-    :esp32: * :ref:`external_ram_config_noinit`
+    * :ref:`external_ram_config_bss`
+    * :ref:`external_ram_config_noinit`
 
 .. _external_ram_config_memory_map:
 
@@ -94,36 +94,32 @@ If a suitable block of preferred internal/external memory is not available, the
 
 Because some buffers can only be allocated in internal memory, a second configuration item :ref:`CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL` defines a pool of internal memory which is reserved for *only* explicitly internal allocations (such as memory for DMA use). Regular ``malloc()`` will not allocate from this pool. The :ref:`MALLOC_CAP_DMA <dma-capable-memory>` and ``MALLOC_CAP_INTERNAL`` flags can be used to allocate memory from this pool.
 
-.. only:: SOC_SPIRAM_SUPPORTED
+.. _external_ram_config_bss:
 
-    .. _external_ram_config_bss:
+Allow .bss Segment to be Placed in External Memory
+-------------------------------------------------------
 
-    Allow .bss Segment to be Placed in External Memory
-    -------------------------------------------------------
+Enable this option by checking :ref:`CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY`. This configuration setting is independent of the other three.
 
-    Enable this option by checking :ref:`CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY`. This configuration setting is independent of the other three.
+If enabled, the region of the data virtual address space where the PSRAM is mapped to will be used to store zero-initialized data (BSS segment) from the lwIP, net80211, libpp, wpa_supplicant and bluedroid ESP-IDF libraries.
 
-    If enabled, the region of the data virtual address space where the PSRAM is mapped to will be used to store zero-initialized data (BSS segment) from the lwIP, net80211, libpp, wpa_supplicant and bluedroid ESP-IDF libraries.
+Additional data can be moved from the internal BSS segment to external RAM by applying the macro ``EXT_RAM_BSS_ATTR`` to any static declaration (which is not initialized to a non-zero value).
 
-    Additional data can be moved from the internal BSS segment to external RAM by applying the macro ``EXT_RAM_BSS_ATTR`` to any static declaration (which is not initialized to a non-zero value).
+It is also possible to place the BSS section of a component or a library to external RAM using linker fragment scheme ``extram_bss``.
 
-    It is also possible to place the BSS section of a component or a library to external RAM using linker fragment scheme ``extram_bss``.
+This option reduces the internal static memory used by the BSS segment.
 
-    This option reduces the internal static memory used by the BSS segment.
+Remaining external RAM can also be added to the capability heap allocator using the method shown above.
 
-    Remaining external RAM can also be added to the capability heap allocator using the method shown above.
 
+.. _external_ram_config_noinit:
 
-.. only:: esp32
-
-    .. _external_ram_config_noinit:
-
-    Allow .noinit Segment to be Placed in External Memory
-    --------------------------------------------------------------
+Allow .noinit Segment to Be Placed in External Memory
+--------------------------------------------------------------
 
-    Enable this option by checking :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY`. If enabled, a region of the address space provided in external RAM will be used to store non-initialized data. The values placed in this segment will not be initialized or modified even during startup or restart.
+Enable this option by checking :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY`. If enabled, the region of the data virtual address space where the PSRAM is mapped to will be used to store non-initialized data. The values placed in this segment will not be initialized or modified even during startup or restart.
 
-    By applying the macro ``EXT_RAM_NOINIT_ATTR``, data could be moved from the internal NOINIT segment to external RAM. Remaining external RAM can still be added to the capability heap allocator using the method shown above, :ref:`external_ram_config_capability_allocator`.
+By applying the macro ``EXT_RAM_NOINIT_ATTR``, data could be moved from the internal NOINIT segment to external RAM. Remaining external RAM can still be added to the capability heap allocator using the method shown above, :ref:`external_ram_config_capability_allocator`.
 
 Restrictions
 ============

docs/en/api-guides/memory-types.rst

@@ -38,7 +38,7 @@ Constant data may also be placed into DRAM, for example if it is used in an non-
 
 The macro ``__NOINIT_ATTR`` can be used as attribute to place data into ``.noinit`` section. The values placed into this section will not be initialized at startup and should keep its value after software restart.
 
-.. only:: esp32
+.. only:: SOC_SPIRAM_SUPPORTED
 
     By applying the ``EXT_RAM_NOINIT_ATTR`` macro, non-initialized value could also be placed in external RAM. To do this, the :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY` needs to be enabled. See :ref:`external_ram_config_noinit`. If the :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY` is not enabled, ``EXT_RAM_NOINIT_ATTR`` will behave just as ``__NOINIT_ATTR``, it will make data to be placed into ``.noinit`` segment in internal RAM.
 

docs/zh_CN/api-guides/external-ram.rst

@@ -41,8 +41,8 @@ ESP-IDF 完全支持将片外 RAM 集成到您的应用程序中。在启动并
     * :ref:`external_ram_config_memory_map`
     * :ref:`external_ram_config_capability_allocator`
     * :ref:`external_ram_config_malloc` (default)
-    :esp32 or esp32s2: * :ref:`external_ram_config_bss`
-    :esp32: * :ref:`external_ram_config_noinit`
+    * :ref:`external_ram_config_bss`
+    * :ref:`external_ram_config_noinit`
 
 .. _external_ram_config_memory_map:
 
@@ -91,36 +91,32 @@ ESP-IDF 启动过程中，片外 RAM 被映射到以 {IDF_TARGET_PSRAM_ADDR_STAR
 
 由于有些内存缓冲器仅可在内部存储器中分配，因此需要使用第二个配置项 :ref:`CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL` 定义一个内部内存池，仅限显式的内部存储器分配使用（例如用于 DMA 的存储器）。常规 ``malloc()`` 将不会从该池中分配，但可以使用 :ref:`MALLOC_CAP_DMA <dma-capable-memory>` 和 ``MALLOC_CAP_INTERNAL`` 标志从该池中分配存储器。
 
-.. only:: SOC_SPIRAM_SUPPORTED
+.. _external_ram_config_bss:
 
-    .. _external_ram_config_bss:
+允许 .bss 段放入片外存储器
+-----------------------------------
 
-    允许 .bss 段放入片外存储器
-    -----------------------------------
+通过勾选 :ref:`CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY` 启用该选项，此选项配置与其它三个选项互不影响。
 
-    通过勾选 :ref:`CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY` 启用该选项，此选项配置与其它三个选项互不影响。
+启用该选项后，PSRAM 被映射到的数据虚拟地址空间将用于存储来自 lwip、net80211、libpp, wpa_supplicant 和 bluedroid ESP-IDF 库中零初始化的数据（BSS 段）。
 
-    启用该选项后，PSRAM 被映射到的数据虚拟地址空间将用于存储来自 lwip、net80211、libpp, wpa_supplicant 和 bluedroid ESP-IDF 库中零初始化的数据（BSS 段）。
+``EXT_RAM_BSS_ATTR`` 宏应用于任何静态声明（未初始化为非零值）之后，可以将附加数据从内部 BSS 段移到片外 RAM。
 
-    ``EXT_RAM_BSS_ATTR`` 宏应用于任何静态声明（未初始化为非零值）之后，可以将附加数据从内部 BSS 段移到片外 RAM。
+也可以使用链接器片段方案 ``extram_bss`` 将组件或库的 BSS 段放到片外 RAM 中。
 
-    也可以使用链接器片段方案 ``extram_bss`` 将组件或库的 BSS 段放到片外 RAM 中。
+启用此选项可以减少 BSS 段占用的内部静态存储。
 
-    启用此选项可以减少 BSS 段占用的内部静态存储。
+剩余的片外 RAM 也可以通过上述方法添加到堆分配器中。
 
-    剩余的片外 RAM 也可以通过上述方法添加到堆分配器中。
 
+.. _external_ram_config_noinit:
 
-.. only:: esp32
-
-    .. _external_ram_config_noinit:
-
-    允许 .noinit 段放入片外存储器
-    -------------------------------------
+允许 .noinit 段放入片外存储器
+-------------------------------------
 
-    通过勾选 :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY` 启用该选项。启用该选项后，外部 RAM 中提供的地址空间区域将用于存储未初始化的数据。即使在启动或重新启动期间，放置在该段中的值也不会被初始化或修改。
+通过勾选 :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY` 启用该选项。启用该选项后，PSRAM 被映射到的数据虚拟地址空间将用于存储未初始化的数据。即使在启动或重新启动期间，放置在该段中的值也不会被初始化或修改。
 
-    通过应用 ``EXT_RAM_NOINIT_ATTR`` 宏，可以将数据从内部 NOINIT 段移到片外 RAM。剩余的片外 RAM 也可以通过上述方法添加到堆分配器中，具体请参考 :ref:`external_ram_config_capability_allocator`。
+通过应用 ``EXT_RAM_NOINIT_ATTR`` 宏，可以将数据从内部 NOINIT 段移到片外 RAM。剩余的片外 RAM 也可以通过上述方法添加到堆分配器中，具体请参考 :ref:`external_ram_config_capability_allocator`。
 
 片外 RAM 使用限制
 ===================

docs/zh_CN/api-guides/memory-types.rst

@@ -38,7 +38,7 @@ DRAM（数据 RAM）
 
 可以将 ``__NOINIT_ATTR`` 宏用作属性，从而将数据放入 ``.noinit`` 部分。放入该部分的值在启动时不会被初始化，在软件重启后也会保持值不变。
 
-.. only:: esp32
+.. only:: SOC_SPIRAM_SUPPORTED
 
    通过使用 ``EXT_RAM_NOINIT_ATTR`` 宏，noinit 数据也可以放入外部 RAM 中。为此，需要启用 :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY`，可参考 :ref:`external_ram_config_noinit`。如果没有启用 :ref:`CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY`， ``EXT_RAM_NOINIT_ATTR`` 会和 ``__NOINIT_ATTR`` 一样，将数据放入内部 RAM 的 ``.noinit`` 部分。
 

tools/unit-test-app/configs/psram_noinit

@@ -0,0 +1,7 @@
+TEST_COMPONENTS=spi_flash
+
+CONFIG_SPIRAM=y
+CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY=y
+CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY=y
+
+CONFIG_IDF_TARGET="esp32s2"