Some GPIO pins don't work. Using python-rpi.gpio

Hi,
I'm following the example "Blink an LED on a GPIO output pin"
in this document: https://up-community.org/wiki/RPi.GPIO
The example uses pin 4 (in the arragement of GPIO.BCM) to control LED.
No problem with that.
But if I changed to pin 27, 22, 23, 24; then the LED won't blink.
If I changed to pin 2, 3, 14; the LED will blink.
Why?
I'm following the example "Blink an LED on a GPIO output pin"
in this document: https://up-community.org/wiki/RPi.GPIO
The example uses pin 4 (in the arragement of GPIO.BCM) to control LED.
No problem with that.
But if I changed to pin 27, 22, 23, 24; then the LED won't blink.
If I changed to pin 2, 3, 14; the LED will blink.
Why?
Comments
https://up-community.org/wiki/RPi.GPIO
I found that some pins won't work for some functionalities.
Is the UP board(Ubilinux)'s implementation of RPi.GPIO(python-rpi.gpio) complete?
It will be available in the coming weeks.
Let me know if you might have any feedback!
Thanks.
does it have PWM (even if only the rpi.gpio software version) working?