BIOS Bus Master Option

[Lloyd Bircher <nicad2@yahoo.com>]

I am having an issue with a legacy PCI configuration
in an x86 PC. There is an option in many BIOS setups
for disabling Bus Mastering for ALL PCI devices in a
system. The original purpose of this option was to
allow broken Bus Masters to function. However, this
setting does not selectively disable problem adapters,
it disables Bus Mastering on ALL PCI devices.

Does anyone know a good reason why this option should
exist in a modern PCI system? Are there many cards
that have broken BM capabilty?

Thanks in advance.

Lloyd Bircher
BIOS Programmer
Compaq Computer Corporation

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