Hello, and welcome! INSTALL.armv7 says:
Code:
Please be aware that OpenBSD support for this platform is far from
complete.
At the moment the only way to boot the OpenBSD install is to copy the
miniroot for your board "miniroot-{am335x,beagle,imx,panda,sunxi}-55.fs"
image to an sdcard.
In addition, the arcihtecture is not listed among those with
diskless(8) operation.
Since what you wish to do is not currently supported, I recommend opening a discussion on the arm@ OpenBSD
mailing list, where knowledge of the OS on the ARM architecture is far greater.