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[esp32] Place FreeRTOS functions in flash by default (prep for IDF 6.0)

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J. Nick Koston
2025-11-29 02:32:40 -06:00
parent b71d8010d2
commit 64281631a1
1 changed files with 11 additions and 0 deletions
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11
esphome/components/esp32/__init__.py
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@@ -584,6 +584,7 @@ CONF_DISABLE_LIBC_LOCKS_IN_IRAM = "disable_libc_locks_in_iram"
CONF_DISABLE_VFS_SUPPORT_TERMIOS = "disable_vfs_support_termios"
CONF_DISABLE_VFS_SUPPORT_SELECT = "disable_vfs_support_select"
CONF_DISABLE_VFS_SUPPORT_DIR = "disable_vfs_support_dir"
CONF_FREERTOS_IN_IRAM = "freertos_in_iram"
CONF_LOOP_TASK_STACK_SIZE = "loop_task_stack_size"
# VFS requirement tracking
@@ -677,6 +678,7 @@ FRAMEWORK_SCHEMA = cv.Schema(
cv.Optional(CONF_DISABLE_VFS_SUPPORT_TERMIOS, default=True): cv.boolean,
cv.Optional(CONF_DISABLE_VFS_SUPPORT_SELECT, default=True): cv.boolean,
cv.Optional(CONF_DISABLE_VFS_SUPPORT_DIR, default=True): cv.boolean,
cv.Optional(CONF_FREERTOS_IN_IRAM, default=False): cv.boolean,
cv.Optional(CONF_EXECUTE_FROM_PSRAM, default=False): cv.boolean,
cv.Optional(CONF_LOOP_TASK_STACK_SIZE, default=8192): cv.int_range(
min=8192, max=32768
@@ -1003,6 +1005,15 @@ async def to_code(config):
# Increase freertos tick speed from 100Hz to 1kHz so that delay() resolution is 1ms
add_idf_sdkconfig_option("CONFIG_FREERTOS_HZ", 1000)
# Place non-ISR FreeRTOS functions into flash instead of IRAM
# This saves up to 8KB of IRAM. ISR-safe functions (FromISR variants) stay in IRAM.
# In ESP-IDF 6.0 this becomes the default and CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH
# is removed. We enable this now to match IDF 6.0 behavior and catch any issues early.
# Users can set freertos_in_iram: true as an escape hatch if they encounter problems
# with code that incorrectly calls FreeRTOS functions from ISRs with cache disabled.
if not conf[CONF_ADVANCED][CONF_FREERTOS_IN_IRAM]:
add_idf_sdkconfig_option("CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH", True)
# Setup watchdog
add_idf_sdkconfig_option("CONFIG_ESP_TASK_WDT", True)
add_idf_sdkconfig_option("CONFIG_ESP_TASK_WDT_PANIC", True)