Ok, just got the "official" answer from SM and you are not going to like it :f
Our product manager informed us that the X10SDV all released SKUs with D-1540 and D-1520 CPU onboard motherboards do not officially support SR-IOV, and therefore we cannot guarantee that this function will work without any issues.
That’s also the reason why this bios setting was removed."
I have asked them again how is this possible since they have announced it as having the feature for example here on this press release:
Supermicro | News | Supermicro® Launches New Line of Low Power, High Density Server Solutions Supporting Intel® Xeon® Processor D-1500
"X10SDV-F/-TLN4F – Mini-ITX Motherboard (6.7” x 6.7”) supports single Intel® Xeon® processor D-1540 SoC (8 core, 45W),VT-d/x, TXT, AES-NI, SR-IOV, Xeon RAS, built in 10GbE. 128GB 2133MHz DDR4 RDIMM or 64GB UDIMM in 4x DIMMs, 6x SATA 3.0, 1x M.2 slot (M key for SSD, 2242/2280, PCIe3.0 x4), 2x USB 3.0, 4x USB 2.0, 1x PCIe 3.0 x16, Quad LAN ports with SoC dual 10GbE and I350-AM2 dual GbE (-F with dual GbE only), IPMI 2.0 with KVM and dedicated port, 0-60°C operating temperature, 4 pin 12V DC and ATX power source"
Let's see but I don't have my hopes high. If someone has a more direct contact at SM it would be nice to clear this up for once.
Tonight or tomorrow I will post the custom BIOS they sent, but use it at your own discretion. As it turns own it doesn't seem to be officially supported.