Can't seem to drive P1_4/P1_5 on newer SDK

Hi,

I am trying to drive pin 1_4 and 1_5 (defaulted as SWD pins) as GPIO. I could do it on DSPS test project,
然而,它似乎没有work on newest SDK (5.03). I have checked the P14_MODE_REG and P15_MODE_REG
everytime I do PIO_SetActive/PIO_SetInactive on these pins. Both seem to show correct configuration.

P14_MODE_REG -- *(0x5000302E) showing 0x0300 (as gpio(0b0), output(0b11))
P15_MODE_REG -- *(0x50003030) showing 0x0300 (as gpio(0b0), output(0b11))

However, I cannot see any change on the pin.

I use RCX20 as low power clock if that's relevant.

Is there any different settings regarding GPIO on newer SDK?

Thanks