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황영시(Youngsi Hwang),김원진(Wonjin Kim),정찬민(Chanmin Jung),정기석(Kiseok Chung) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
Embedded OS-directed power management techniques have gained lots of attention lately. Because the OS has the manager of the overall system operation, and has the exact information of the running system. Power management by the OS may have great impact for the optimization of the power consumption. The ACPI (Advanced Configuration and Power Interface) is an open industry specification co-developed by Intel, Microsoft, and Toshiba that defines a flexible and extensible interface for power management in PCs and related hardware. Since the ACPI lias been proposed for the desktop PC, it is not sufficient to aggressively manage the power mode for embedded systems. Therefore, we implement E-ACPI, an extended ACPI which is designed for an advanced power management of embedded systems. In this paper, we address (ⅰ) how we extend the exiting ACPI to E-ACPI, (ⅱ) technical challenges to overcome in implementation, and (ⅲ) how we port our E-ACPI to an embedded linux system in this paper. Experimental results show that our E-ACPI is very useful and effective in practice.