BCM QS750 User Manual download pdf (Page 39)

4. BIOS Setup

Shadowing copies firmware from ROM into system RAM, where the CPU can read it

through the 16-bit or 32-bit DRAM bus. Firmware not shadowed must be read by the system

through the 8-bit X-bus. Shadowing improves the performance of the system BIOS and

similar ROM firmware for expansion peripherals, but it also reduces the amount of high

memory (640 KB to 1 MB) available for loading device drivers, etc.

Enable shadowing into each section of memory separately. Many system designers hardwire

shadowing of the system BIOS and eliminate a System BIOS Shadow option.

Video BIOS shadows into memory area C0000-C7FFF. The remaining areas shown on the

BIOS Features Setup screen may be occupied by other expansion card firmware. If an

expansion peripheral in your system contains ROM-based firmware, you need to know the

address range the ROM occupies to shadow it into the correct area of RAM.

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BCM QS750 User Manual Page 39