Hi, Evan
In situations like this (I too like to play with
not-very-mainstream/noname boards) I have little tricks:
1. You can use official linux images to extract needed parts of data
(they all just DD-ble with some addresses) or just get it from the
booted system.
2. Most of the time simplest method is just boot from the official
image, drop to uboot, boot from OpenBSD usb flash and install on top
of SD with the official image. 99% sure OpenBSD will not rewrite
bootable needed parts of sd/mmc
3. Often you can find separate bootloader files near official images.
4/ Also you can find/patch a dtb file and load it from OpenBSD's
bootloader with machine dtb <file.dtb> before loading OS (EXTREMELY
USEFUL!)
