1# Common (non-chip-specific) SPIRAM options
2#
3# sourced into the "SPIRAM config" submenu for ESP32 or ESP32S2
4
5# invisible option selected by ESP32_SPIRAM_SUPPORT || ESP32S2_SPIRAM_SUPPORT
6config SPIRAM
7    bool
8
9config SPIRAM_BOOT_INIT
10    bool "Initialize SPI RAM during startup"
11    default "y"
12    help
13        If this is enabled, the SPI RAM will be enabled during initial boot. Unless you
14        have specific requirements, you'll want to leave this enabled so memory allocated
15        during boot-up can also be placed in SPI RAM.
16
17config SPIRAM_IGNORE_NOTFOUND
18    bool "Ignore PSRAM when not found"
19    default "n"
20    depends on SPIRAM_BOOT_INIT && !SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
21    help
22        Normally, if psram initialization is enabled during compile time but not found at runtime, it
23        is seen as an error making the CPU panic. If this is enabled, booting will complete
24        but no PSRAM will be available.
25
26choice SPIRAM_USE
27    prompt "SPI RAM access method"
28    default SPIRAM_USE_MALLOC
29    help
30        The SPI RAM can be accessed in multiple methods: by just having it available as an unmanaged
31        memory region in the CPU's memory map, by integrating it in the heap as 'special' memory
32        needing heap_caps_malloc to allocate, or by fully integrating it making malloc() also able to
33        return SPI RAM pointers.
34
35    config SPIRAM_USE_MEMMAP
36        bool "Integrate RAM into memory map"
37    config SPIRAM_USE_CAPS_ALLOC
38        bool "Make RAM allocatable using heap_caps_malloc(..., MALLOC_CAP_SPIRAM)"
39    config SPIRAM_USE_MALLOC
40        bool "Make RAM allocatable using malloc() as well"
41        select FREERTOS_SUPPORT_STATIC_ALLOCATION
42endchoice
43
44config SPIRAM_MEMTEST
45    bool "Run memory test on SPI RAM initialization"
46    default "y"
47    depends on SPIRAM_BOOT_INIT
48    help
49        Runs a rudimentary memory test on initialization. Aborts when memory test fails. Disable this for
50        slightly faster startup.
51
52config SPIRAM_MALLOC_ALWAYSINTERNAL
53    int "Maximum malloc() size, in bytes, to always put in internal memory"
54    depends on SPIRAM_USE_MALLOC
55    default 16384
56    range 0 131072
57    help
58        If malloc() is capable of also allocating SPI-connected ram, its allocation strategy will prefer to
59        allocate chunks less than this size in internal memory, while allocations larger than this will be
60        done from external RAM. If allocation from the preferred region fails, an attempt is made to allocate
61        from the non-preferred region instead, so malloc() will not suddenly fail when either internal or
62        external memory is full.
63
64config SPIRAM_TRY_ALLOCATE_WIFI_LWIP
65    bool "Try to allocate memories of WiFi and LWIP in SPIRAM firstly. If failed, allocate internal memory"
66    depends on SPIRAM_USE_CAPS_ALLOC || SPIRAM_USE_MALLOC
67    default "n"
68    help
69        Try to allocate memories of WiFi and LWIP in SPIRAM firstly. If failed, try to allocate internal
70        memory then.
71
72config SPIRAM_MALLOC_RESERVE_INTERNAL
73    int "Reserve this amount of bytes for data that specifically needs to be in DMA or internal memory"
74    depends on SPIRAM_USE_MALLOC
75    default 32768
76    range 0 262144
77    help
78        Because the external/internal RAM allocation strategy is not always perfect, it sometimes may happen
79        that the internal memory is entirely filled up. This causes allocations that are specifically done in
80        internal memory, for example the stack for new tasks or memory to service DMA or have memory that's
81        also available when SPI cache is down, to fail. This option reserves a pool specifically for requests
82        like that; the memory in this pool is not given out when a normal malloc() is called.
83
84        Set this to 0 to disable this feature.
85
86        Note that because FreeRTOS stacks are forced to internal memory, they will also use this memory pool;
87        be sure to keep this in mind when adjusting this value.
88
89        Note also that the DMA reserved pool may not be one single contiguous memory region, depending on the
90        configured size and the static memory usage of the app.
91
92config SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
93    bool "Allow .bss segment placed in external memory"
94    default n
95    depends on SPIRAM
96    select ESP_ALLOW_BSS_SEG_EXTERNAL_MEMORY
97    help
98        If enabled, variables with EXT_RAM_ATTR attribute will be placed in SPIRAM instead of internal DRAM.
99        BSS section of `lwip`, `net80211`, `pp`, `bt` libraries will be automatically placed
100        in SPIRAM. BSS sections from other object files and libraries can also be placed in SPIRAM through
101        linker fragment scheme `extram_bss`.
102
103        Note that the variables placed in SPIRAM using EXT_RAM_ATTR will be zero initialized.
104