GPIO

https://blog.csdn.net/xnwyd/article/details/9042159

https://www.emcraft.com/som/vf6/controlling-gpio-from-linux

Now run the following shell commands to turn the LED on and off at a 1Hz frequency:
while echo hey; do echo 1 > gpio36/value; sleep 1; echo 0 > gpio36/value; sleep 1; done

LTE_LEDon	MX6_PAD_GPIO_1__GPIO_1_1	md 20E0210
LED1	MX6_PAD_DISP0_DAT0__GPIO4_IO21	md 20E00B0
LED2	MX6_PAD_GPIO_2__GPIO1_IO02	md 20E0224
LED3	MX6_PAD_GPIO_4__GPIO1_IO04	md 20E022C
LED4	MX6_PAD_GPIO_5__GPIO1_IO05	md 20E0230
LED5	MX6_PAD_EIM_D29__GPIO3_IO29	md 20E0178
LED6	MX6_PAD_EIM_D16__GPIO3_IO16	md 20E0144

全亮: mw 20A8000 200000 mw 209C000 36 mw 20A4000 20010000 全熄: mw 20A8000 00 mw 209C000 00 mw 20A4000 00