This is an SD card image for Radxa E25.
You can burn it to an SD card and run it on the E25.
It can also be used to test FreeBSD on other devices on the RK356x,
but then it needs to be written to a USB flash and your device’s UEFI to an SD card or EMMc.
At the same time, the FDT mode is used on the E25, and when testing on other devices,
I recommend using the ACPI mode.
FreeBSD does not currently support RK3588, so
You need UEFI for Radxa Rock-5B.