esp-idf/components/driver/uart/Kconfig.uart

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menu "UART Configuration"
config UART_ISR_IN_IRAM
bool "Place UART ISR function into IRAM"
depends on !RINGBUF_PLACE_ISR_FUNCTIONS_INTO_FLASH
select VFS_SELECT_IN_RAM if VFS_SUPPORT_SELECT
default n
help
If this option is not selected, UART interrupt will be disabled for a long time and
may cause data lost when doing spi flash operation.
endmenu # UART Configuration