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2 .\" Copyright (c) 2017-2019 Alexander Motin <mav@FreeBSD.org>
31 .Nd PLX/Avago/Broadcom Non-Transparent Bridge driver
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48 .Bl -ohang
50 Being set to 1 (default) tells the driver attached to Virtual Interface of the
51 NTB that it works in NTB-to-NTB (back-to-back) mode, 0 -- NTB-to-Root Port.
52 Driver attached to Link Interface (visible from Root Port side) switches to
53 NTB-to-Root Port mode automatically, but one attached to Virtual Interface
57 Lookup Table (A-LUT).
62 driver provides support for the Non-Transparent Bridge (NTB) hardware in
63 PLX PCIe bridge chips, which allow up to two of their PCIe ports to be
64 switched from transparent to non-transparent bridge mode.
71 Each PLX NTB provides up to 2 64-bit or 4 32-bit memory windows to the
74 If Address Lookup Table (A-LUT) is enabled, BAR2 can be split into several
76 In NTB-to-NTB mode one of memory windows (or half of it, if bigger then 1MB)
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100 It includes enabling NTB on one or both sides (choosing between NTB-to-NTB
101 (back-to-back) and NTB-to-Root Port modes) and configuring BARs sizes.
103 The recommended mode is NTB-to-NTB mode, since while NTB-to-Root Port is
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