ADLINK CM1-86DX3 PC/104 Embedded Single Board Computer Engineering Application Guide

Key points for BIOS setup and system debugging

1. Basic configuration and serial port redirection

After booting up, press the DEL key to enter the AMI BIOS settings interface. For "head node" devices without displays, the Serial Console function can be used to configure BIOS through COM1 or COM2 connection terminals. Please enable the Advanced>Remote Access option and ensure that the terminal serial port parameters (such as 115200, 8N1) match the board.

2. Oops! Jumper and BIOS recovery

If incorrect BIOS settings cause the system to fail to start (such as incorrect memory timing or IDE configuration), onboard Oops can be used! Jumper (CN15) or short circuit the DTR (pin 4) and RI (pin 9) of COM1 to force the system to start at default settings. This feature is extremely practical during the debugging phase, avoiding the tedious operation of dismantling the battery and clearing the CMOS due to configuration errors.

3. Startup sequence and storage devices

In the Boot menu, you can set to boot from CFast, SATA hard drive, USB, or network (PXE). It should be noted that the official technical manual clearly states that external HDD/SSD is not recommended as a boot device. In terms of design, it is recommended to prioritize the use of industrial grade solid-state drives with onboard CFast slots or SATA connections to ensure connection reliability in vibration environments.

4. Precautions for ACPI and Power Management

The Vortex86-DX3 SoC has limited support for ACPI, so the "soft shutdown" function cannot be implemented on Windows 7 or Linux systems. When the system executes the shutdown command and the screen cursor stops flashing, the user needs to manually disconnect the power. If remote or timed shutdown is required, consideration should be given to designing an external power control circuit.

Expansion and advanced feature applications

1. SEMA Intelligent Management

The onboard BMC (Board Management Controller) chip supports ADLINK's SEMA (Smart Embedded Management Agent) function. With this tool, engineers can call APIs at the operating system level or in applications to obtain the board running status:

Hardware monitoring: Real time reading of core voltage (VCC_CORE, VDDQ, etc.), board temperature, and current consumption.

Watchdog Timer: Set and refresh the watchdog through SEMA API, automatically triggering hardware reset when the system deadlocks, enhancing the system's self-healing ability.

Exception log: BMC indicates the fault type (such as voltage abnormality, critical temperature) through the flashing code of the Status LED, which facilitates quick on-site positioning.

2. CFast storage

The CFast slot (CN13) complies with the SATA 1.5 Gb/s standard and is compatible with CFast 1.1 and 2.0 specifications. LED3 (CFAST-ACT) indicates read and write activity for easy observation of storage status.

3. Gigabit Ethernet Performance Tips

The onboard Intel I210IT Gigabit Network Controller supports PCIe 2.1 interface, but due to the processing performance limitations of the Vortex86-DX3 SoC, the actual throughput is approximately 550-600 Mbps (full duplex). When designing high network load applications, it is necessary to evaluate bandwidth requirements reasonably and avoid expecting theoretical gigabit line speeds.

Precautions for Engineering Deployment

Anti static measures: Before operating or installing the board, it is necessary to wear an anti-static wrist strap to ensure that the human body and the board are at the same potential, and to avoid damaging sensitive components due to electrostatic discharge.

Power quality: The ripple of the+5V input power supply should be controlled within ± 50mV, and the power supply current should meet the total power consumption requirements of the board and peripherals (recommended to be at least 5A). When the voltage drops below 4.65V, a low voltage reset will be triggered.

System resource conflict: When configuring serial ports or PCI devices in BIOS, attention should be paid to the allocation of I/O addresses and interrupt numbers (IRQs). For example, COM1 defaults to occupying IRQ4 and address 3F8h. If an ISA expansion card is added, resource conflicts should be avoided, otherwise it may cause the device to be unrecognizable or the system to be unstable.