This page describes how to run coreboot on the ASUS P5Q desktop board.
+-------------------+----------------+ | Type | Value | +===================+================+ | Socketed flash | Yes | +-------------------+----------------+ | Model | MX25L8005 | +-------------------+----------------+ | Size | 1 MiB | +-------------------+----------------+ | Package | Socketed DIP-8 | +-------------------+----------------+ | Write protection | No | +-------------------+----------------+ | Dual BIOS feature | No | +-------------------+----------------+ | Internal flashing | Yes | +-------------------+----------------+
You can flash coreboot into your motherboard using this guide.
+------------------+---------------------------------------------------+ | Northbridge | Intel P45 (called x4x in coreboot code) | +------------------+---------------------------------------------------+ | Southbridge | Intel ICH10R (called i82801jx in coreboot code) | +------------------+---------------------------------------------------+ | CPU (LGA775) | Model f4x, f6x, 6fx, 1067x (Pentium 4, d, Core 2) | +------------------+---------------------------------------------------+ | SuperIO | Winbond W83667HG | +------------------+---------------------------------------------------+ | Coprocessor | No | +------------------+---------------------------------------------------+ | Clockgen (CK505) | ICS 9LPRS918JKLF | +------------------+---------------------------------------------------+
With vendor firmware, the P5Q uses the ATK0110 ACPI device to control its fans according to the parameters configured in the BIOS setup menu. With coreboot, one can instead control the Super I/O directly as described in the kernel docs:
These commands set the chassis fans to a constant speed:
# Use PWM output echo 1 >/sys/class/hwmon/hwmon2/pwm1_mode # Set to manual mode echo 1 >/sys/class/hwmon/hwmon2/pwm1_enable # Set relative speed: 0 (stop) to 255 (full) echo 150 >/sys/class/hwmon/hwmon2/pwm1
The W83667HG can adjust fan speeds when things get too warm. These settings will control the chassis fans:
# Set to "Thermal Cruise" mode echo 2 >/sys/class/hwmon/hwmon2/pwm1_enable # Target temperature: 60°C echo 60000 >/sys/class/hwmon/hwmon2/pwm1_target # Minimum fan speed when spinning up echo 135 >/sys/class/hwmon/hwmon2/pwm1_start_output # Minimum fan speed when spinning down echo 135 >/sys/class/hwmon/hwmon2/pwm1_stop_output # Tolerance: 2°C echo 2000 >/sys/class/hwmon/hwmon2/pwm1_tolerance # Turn fans off after 600 seconds when below defined range echo 600000 >/sys/class/hwmon/hwmon2/pwm1_stop_time
You can also control the CPU fan with similar rules:
# Switch to "Thermal Cruise" mode echo 2 >/sys/class/hwmon/hwmon2/pwm2_enable # Target temperature: 55°C echo 55000 >/sys/class/hwmon/hwmon2/pwm2_target # Minimum fan speed when spinning down echo 50 >/sys/class/hwmon/hwmon2/pwm2_stop_output # Rate of fan speed change echo 50 >/sys/class/hwmon/hwmon2/pwm2_step_output # Maximum fan speed echo 200 >/sys/class/hwmon/hwmon2/pwm2_max_output # Tolerance: 2°C echo 2000 >/sys/class/hwmon/hwmon2/pwm1_tolerance