Fujitsu-Siemens Amilo A1655 Schematic Circuit Diagram

Fujitsu-Siemens Amilo A1655 Schematic Circuit Diagram

Fujitsu-Siemens Amilo A1655 Schematic Circuit Diagram

System Management Mode

SMM was meant to be used by any low-level system operations that need to work independently of the OS and other applications on the device, despite its initial focus on power management. This comprises the following in current systems:

  • Power management functions ACPI and APM
  • Support for older USB devices (keyboard and mouse)
  • USB boot (drive emulation) 
  • Password and security functions
  • Fan speed monitoring
  • Thermal monitoring
  • BIOS updating
  • Complementary Metal Oxide Semiconductor (CMOS) RAM reading/writing
  • Memory error-correcting code (ECC) mistakes are logged.
  • Module for connecting to a trusted platform (TPM)
  • Wake-on-LAN and other wake-and-alert features (WOL)
  • Apart from memory failures, you should keep track of hardware faults.
When the system tries to access a peripheral device that has been turned off to preserve energy, one example of SMM in action happens. Let's imagine a software wants to read a file from a hard drive, but the disk has been turned down to conserve power. The host adapter creates an SMI to call SMM when it receives access. The SMM software then sends orders to the drive to spin up and prepare it for use. As a result, SMM put away control to the OS, and the file load proceeds as if the drive had always been spinning.

A rootkit can also access SMM, which is less useful. A rootkit is an application or a group of apps that may operate with administrator-level privileges without the user's or administrator's authorization. Rootkits are frequently used to transmit malware invisibly.

Free Download Fujitsu-Siemens Amilo A1655 Schematic Circuit Diagram


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