Magma 7 Slot Series Especificações descarregar pdf (Página 35)

During configuration of your system's PCI cards, the PCI bus must be

probed in order to determine which, if any, PCI cards are present in your

system. The probe instructions used ensure that PCI slots that contain

valid cards are configured into your system in a consistent and reliable

manner and that any invalid option card, or empty option slot, is ignored.

In theory, the console configuration code should be able to traverse up

to 255 PCI buses in your system detecting all installed cards and

performing the necessary configuration processing for each discovered

PCI card.

Unfortunately, not all console firmware is created equal. In order to

configure all of your PCI cards installed in the PCI expansion system,

your console firmware must be able to traverse multiple levels of

bridges. In point of fact, the 255 bus limit is a theoretical maximum with

the practical limit somewhat lower (yet should still be a large number,

like 100).

Most modern console firmware and BIOS code allows multiple bridges

(and thus PCI buses) to be correctly configured. Certain older firmware

implementations, however, place an arbitrary limit on the number of

bridge levels that can be traversed during power-on configuration. Your

firmware should be PCI Specification 2.1 compliant in order to

effectively use a MAGMA PCI Expansion System. For "fan-out" and

"daisy chained" system configurations where more than one PCI

expansion system is being used, you should count all of the bridge

levels to your most deeply nested PCI bus to determine the maximum

number of bridge levels that must be traversed.

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Magma 7 Slot Series Especificações Página 35