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

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# Common (non-chip-specific) SPIRAM options
#
# sourced into the "SPIRAM config" submenu for ESP32 or ESP32S2
# invisible option selected by ${target}_SPIRAM_SUPPORT
config SPIRAM
bool
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
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.
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 && (IDF_TARGET_ESP32 || IDF_TARGET_ESP32S2) # ESP32-S3 IDF-1974
select ESP_ALLOW_BSS_SEG_EXTERNAL_MEMORY
help
If enabled, variables with EXT_RAM_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_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.
config SPIRAM_ECC_ENABLE
bool "Enable SPI RAM ECC"
default n
depends on SPIRAM_MODE_OCT && IDF_TARGET_ESP32S3
help
Enable MSPI Error-Correcting Code function when accessing SPIRAM.
If enabled, 1/16 of the SPI RAM total size will be reserved for error-correcting code.