It is known that SPI flash integrated internally on DA14583, and the internal SPI interface pin is P2_0, P2_3, P2_4 P2_9. Is it safe to use P2_3 and P2_4 anytime and may be use for input, output, or input then output such as I2C's SDA pin in our custom board on DA14583 platform? How about P2_0 and P2_9 in the same situation? In a other word, is that some constraints when using these GPIOs after Booting? Thanks a lot.