On Wed, Jan 30, 2013 at 4:47 AM, Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> wrote: > So what I'm going to do now is rework my patch series by removing the > emulated host bridge (which is normally mandatory by PCIe standard, but > Linux doesn't need it, so we don't care), ... This is a tangent since you're removing the emulated host bridge anyway, but it's been mentioned a couple of times, and I'd like to understand this. Jason mentioned earlier in the [07/27] emulated host bridge thread that the PCIe spec requires a host bridge at 00:00.0. I've never seen that mentioned in the spec; can somebody point me to the actual requirement that host bridges appear in config space? My understanding has been that host bridges, whether PCI or PCIe, are required to *exist*, but that the way you enumerate them and configure them is outside the scope of the PCI/PCIe specs. I know that many chips, especially for x86, *do* make the host bridge appear in config space, but I've never seen a requirement for that. Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
