On Sun, 2019-07-14 at 15:09 +0000, Chocron, Jonathan wrote: > > s/host bridge/Root Port/, if I understand correctly. > > > > Ack. > > BTW, what is the main difference between the 2 terms, since they seem > to be (mistakenly?) used interchangeably? The host bridge is the parent of the root port. You can have several root ports under a host bridge in fact. They tend to be part of the same silicon and somewhat intimately linked but they are distinct logical entities. The root port appears as a PCIe p2p bridge sitting on the top level bus provided by the host bridge. The Host Bridge doesn't have to have a representation in config space (it sometimes does historically, but as a sibling of the devices on that top level bus. In PCIe land, these are chipset built-in devices). Ben.
