On Tue, Jul 04, 2000 at 05:22 -0700, Mike Smith wrote:
The Problem with aha1542 (ISA busmaster capable controller)
in PCI boards is that it is located "at the end" of a long
chain to memory. Chances are, busmastering will not work at
all behind the PCI to ISA bridge since all the PCI devices
have higher priority and the ISA gadget never gets any access
granted or at least always too late. You're better off with
a PCI controller.
This is Just Not True.
Can you please tell me more about it? I'm not sure of the
priority thing I mention above, but the fact that ISA busmaster
devices and PCI boards somewhat collide or counter operate
(sorry, lacking better words once more) is what I got from
serious papers here. How direct is the access method an ISA
controller has to the memory when sitting behind a bridge? I
would be glad to believe a 1542B/C in a PCI machine is A Good