On Thu, Nov 15, 2018 at 09:10:26PM +0200, Mika Westerberg wrote: > FireWire is kind of different but there are connectors such as > ExpressCard and NVMe (over U.2 connector) which carry PCIe and are > relatively easy to access without need for a screwdriver. AFAIK some > eGPUs are also using some other proprietary (non-TBT) connector that > carries PCIe.
U.2 is a data center internal form factor with hot plug capability. If you enable an iommu for that by default you will make a lot of people very unhappy. More importantly NVMe is now used for the current/next generation Compact Flash and SD cards, which contain full PCIe gen 3 links.
