SYSTEM BIOS

8.6 USB Legacy Support

The system BIOS ROM checks the USB port, during POST, for the presence of a USB keyboard. This allows a system with only a USB keyboard to be used during ROM-based setup and also on a system with an OS that does not include a USB driver.

On such a system a keystroke will generate an SMI and the SMI handler will retrieve the data from the device and convert it to PS/2 data. The data will be passed to the keyboard controller and processed as in the PS/2 interface. Changing the delay and/or typematic rate of a USB keyboard though BIOS function INT 16 is not supported.

8.7 Management Functions

The management functions of the AMD 780V chipset allow a system unit to be managed remotely over a network. The system BIOS can request the management engine to generate the following alerts:

■Temperature alert

■Fan failure alert

■Chassis intrusion alert

■Watchdog timer alert

■No memory installed alert

 

8-8

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Technical Reference Guide