ODROID-U3
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From Arch Linux ARM ODROID-U3 Page:
- "The ODROID-U3 is a very low cost and high performance development platform based on an Exynos 4412 ARM Cortex-A9 Quad Core 1.7GHz CPU. It has 3 USB 2.0 ports and micro HDMI."
Contents
Installation
See the installation instructions at the Arch Linux ARM ODROID-U3 page.
LEDs
The ODROID-U3 has two LEDs. A red power LED which is always on if power is supplied, and a blue LED which can be configured.
Blue LED
By default, the blue LED is a heartbeat LED, which flashes when the kernel is running. This can be changed through the /sys/class/leds/led1/trigger
interface.
List available triggers
# cat /sys/class/leds/led1/trigger
none mmc0 mmc1 timer oneshot [heartbeat] backlight gpio cpu0 cpu1 cpu2 cpu3 default-on transient
Temporary configuration
Replace TRIGGER
with one of the available triggers. This setting will apply instantly, but be lost upon reboot.
# echo TRIGGER > /sys/class/leds/led1/trigger
Permanent configuration
Replace TRIGGER
with one of the available triggers. This setting will apply upon reboot.
/etc/tmpfiles.d/leds.conf
w /sys/class/leds/led1/trigger - - - - TRIGGER
CPU Fan
The optional CPU fan can be controlled via the /sys/devices/platform/odroidu2-fan
interface.
Fan Mode
# echo auto > /sys/devices/platform/odroidu2-fan/fan_mode
# echo manual > /sys/devices/platform/odroidu2-fan/fan_mode
Fan Speed (Manual Only)
Values range from 0 (0%) to 255 (100%)
# echo 0 > /sys/devices/platform/odroidu2-fan/pwm_duty
# echo 255 > /sys/devices/platform/odroidu2-fan/pwm_duty
Read CPU Temperature
awk '{printf "%3.1f°C\n", $1/1000}' /sys/class/thermal/thermal_zone0/temp