PNVIO: external device interface

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Introduction

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MMIO registers

8-bit space pnvio [0x800]
g80-mmio 0xe000: PNVIO
gf100-mmio 0xe000: PNVIO

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8-bit space pgpio [0x1000]
gf100-mmio 0xd000: PGPIO [GF119:]

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