esp-idf/components/esp_psram/Kconfig.spiram.common

# Common (non-chip-specific) SPIRAM options
#
# sourced into the "SPIRAM config" submenu for a specific chip.

config SPIRAM_BOOT_INIT
    bool "Initialize SPI RAM during startup"
    default "y"
    help
        If this is enabled, the SPI RAM will be enabled during initial boot. Unless you
        have specific requirements, you'll want to leave this enabled so memory allocated
        during boot-up can also be placed in SPI RAM.

config SPIRAM_IGNORE_NOTFOUND
    bool "Ignore PSRAM when not found"
    default "n"
    depends on SPIRAM_BOOT_INIT && !SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY && !SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY
    help
        Normally, if psram initialization is enabled during compile time but not found at runtime, it
        is seen as an error making the CPU panic. If this is enabled, booting will complete
        but no PSRAM will be available. If PSRAM failed to initialize, the following configs may be affected
        and may need to be corrected manually. SPIRAM_TRY_ALLOCATE_WIFI_LWIP will affect some LWIP and WiFi buffer
        default values and range values. Enable SPIRAM_TRY_ALLOCATE_WIFI_LWIP, ESP_WIFI_AMSDU_TX_ENABLED,
        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 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.

choice SPIRAM_USE
    prompt "SPI RAM access method"
    default SPIRAM_USE_MALLOC
    help
        The SPI RAM can be accessed in multiple methods: by just having it available as an unmanaged
        memory region in the CPU's memory map, by integrating it in the heap as 'special' memory
        needing heap_caps_malloc to allocate, or by fully integrating it making malloc() also able to
        return SPI RAM pointers.

    config SPIRAM_USE_MEMMAP
        bool "Integrate RAM into memory map"
    config SPIRAM_USE_CAPS_ALLOC
        bool "Make RAM allocatable using heap_caps_malloc(..., MALLOC_CAP_SPIRAM)"
    config SPIRAM_USE_MALLOC
        bool "Make RAM allocatable using malloc() as well"
        select FREERTOS_SUPPORT_STATIC_ALLOCATION
endchoice

config SPIRAM_MEMTEST
    bool "Run memory test on SPI RAM initialization"
    default "y"
    depends on SPIRAM_BOOT_INIT
    help
        Runs a rudimentary memory test on initialization. Aborts when memory test fails. Disable this for
        slightly faster startup.

config SPIRAM_MALLOC_ALWAYSINTERNAL
    int "Maximum malloc() size, in bytes, to always put in internal memory"
    depends on SPIRAM_USE_MALLOC
    default 16384
    range 0 131072
    help
        If malloc() is capable of also allocating SPI-connected ram, its allocation strategy will prefer to
        allocate chunks less than this size in internal memory, while allocations larger than this will be
        done from external RAM. If allocation from the preferred region fails, an attempt is made to allocate
        from the non-preferred region instead, so malloc() will not suddenly fail when either internal or
        external memory is full.

config SPIRAM_TRY_ALLOCATE_WIFI_LWIP
    bool "Try to allocate memories of WiFi and LWIP in SPIRAM firstly. If failed, allocate internal memory"
    depends on SPIRAM_USE_CAPS_ALLOC || SPIRAM_USE_MALLOC
    default "n"
    help
        Try to allocate memories of WiFi and LWIP in SPIRAM firstly. If failed, try to allocate internal
        memory then.

config SPIRAM_MALLOC_RESERVE_INTERNAL
    int "Reserve this amount of bytes for data that specifically needs to be in DMA or internal memory"
    depends on SPIRAM_USE_MALLOC
    default 32768
    range 0 262144
    help
        Because the external/internal RAM allocation strategy is not always perfect, it sometimes may happen
        that the internal memory is entirely filled up. This causes allocations that are specifically done in
        internal memory, for example the stack for new tasks or memory to service DMA or have memory that's
        also available when SPI cache is down, to fail. This option reserves a pool specifically for requests
        like that; the memory in this pool is not given out when a normal malloc() is called.

        Set this to 0 to disable this feature.

        Note that because FreeRTOS stacks are forced to internal memory, they will also use this memory pool;
        be sure to keep this in mind when adjusting this value.

        Note also that the DMA reserved pool may not be one single contiguous memory region, depending on the
        configured size and the static memory usage of the app.

config SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
    bool "Allow .bss segment placed in external memory"
    default n
    depends on SPIRAM
    select ESP_ALLOW_BSS_SEG_EXTERNAL_MEMORY
    help
        If enabled, variables with EXT_RAM_BSS_ATTR attribute will be placed in SPIRAM instead of internal DRAM.
        BSS section of `lwip`, `net80211`, `pp`, `bt` libraries will be automatically placed
        in SPIRAM. BSS sections from other object files and libraries can also be placed in SPIRAM through
        linker fragment scheme `extram_bss`.

        Note that the variables placed in SPIRAM using EXT_RAM_BSS_ATTR will be zero initialized.

config SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY
    bool "Allow .noinit segment placed in external memory"
    default n
    depends on SPIRAM && IDF_TARGET_ESP32
    help
        If enabled, noinit variables can be placed in PSRAM using EXT_RAM_NOINIT_ATTR.

        Note the values placed into this section will not be initialized at startup and should keep its value
        after software restart.