Here are the outputs:
cat /sys/kernel/debug/gpio
GPIOs 0-383, platform/sunxi-pinctrl, sunxi-pinctrl:
gpio-15 (red_led ) out lo
gpio-16 (? ) out hi
gpio-166 (cd ) in hi
gpio-354 (? ) out lo
gpio-362 (green_led ) out hi
./devmem2 0x1F02C04 w
/dev/mem opened.
Memory mapped at address 0xb6f1c000.
Illegal data type '▒'.
Yes, I am talking about the MicroUSB port. Thanks!