| P5MEMBAR(4) | Device Drivers Manual (amiga) | P5MEMBAR(4) | 
p5membar —
p5membar* at zbus0
p5membar driver provides support for automatically
  configured Phase5 PCI bridge resources. It is needed for proper operation of
  the amiga/p5pb(4) when
  G-REX firmware is running on processor board, and Phase5 PCI hardware is
  present in the machine. Known firmware versions automatically allocationg
  these resources include 44.69 and 44.71.
p5membar device first appeared in
  NetBSD 6.0.
p5membar driver was written by
  Radoslaw Kujawa
  <radoslaw.kujawa@gmail.com>.
| February 17, 2017 | NetBSD 9.4 |