On Tue, Jun 25, 2019 at 10:23:33PM +1000, Benjamin Herrenschmidt wrote: > On Tue, 2019-06-25 at 15:04 +0300, Mika Westerberg wrote: > > > What's your experience in that area ? How (well) do they handle it in > > > the boot firmware ? at least on arm64, boot firmwares are rather > > > catastrophic when it comes to PCI, and on other embedded devices they > > > are basically non-existent. > > > > Well my experience is quite limited to recent Macs and PCs which usually > > handle the initial resource allocation just fine. In case of Thunderbolt > > some "older" PCs handle everything in firmware, even the runtime > > resource allocation via SMI handler accompanied with ACPI hotplug. > > Ah so this is what Lenovo calls "Thunderbolt firmware assist" in the > BIOS ? Yes, exactly. > I turned that on, it did help with Linux :) Well, it should also work using native PCIe with recent kernels. At least that's what I've been trying to get working since last year ;-)
