No ConOut(Dev) on ASUS PRIME Z590M-PLUS UEFI

From: Ruben van Staveren via freebsd-stable <freebsd-stable_at_freebsd.org> Date: Tue, 5 Oct 2021 16:40:03 +0200

Hi list, 

I’m a bit puzzled on what happens on my Asus Prime Z590M-PLUS motherboard as it has no video console with UEFI booting. After scanning some of the source code I’ve learned that apparently ConOut/ConOutDev is required but this motherboard doesn’t show them. Otherwise I’m fine with a working serial console

$ sudo efivar | grep -- -Con
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConIn
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConInDev

A FreeBSD bhyve vm using UEFI boot shows this instead

$ sudo efivar | grep -- -Con
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConInDev
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConOutDev
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConOut
8be4df61-93ca-11d2-aa0d-00e098032b8c-ConIn

Best regards,
    Ruben