Write zeros into the base/bounds register bars.  We need to do this because NEWBUS (and I think some versions of Windows sometimes) writes 0xffffffff to these registers to disable them.  When they are "disabled" like this, writing memory ranges to the pcic registers are ignored and you will get "card (null) (null)" when you insert a call otherwise.
Write zeros into the base/bounds register bars.  We need to do this
because NEWBUS (and I think some versions of Windows sometimes) writes
0xffffffff to these registers to disable them.  When they are
"disabled" like this, writing memory ranges to the pcic registers are
ignored and you will get "card (null) (null)" when you insert a call
otherwise.

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