Just to help new users, I had progress on the matter as to using new uefi images and choosing on OpenBSD boot console the dtb option by typing just dtb on it. Then it loaded dtb aware and all NICs were shown.

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Hello, I have a R5S and I am struggling to use it on OpenBSD. I can boot it, but I need it to use the DeviceTree option on the System Table Selection under System Configuration. But even though I chose Devicetree and saving it using F10 and hitting "Y", when I boot the operating system it ...