https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220043

--- Comment #3 from Ed Maste <ema...@freebsd.org> ---
In my case the system came up at 640x480, with either black or arbitrary pixels
in the right portion of the screen.

The resolution needs to be explicitly set in the bootloader config, via the
following in /config.txt in the FAT bootloader partition:

# Force HDMI config
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt=800 480 60 6 0 0 0

These settings magically make their way through to the EFI framebuffer; the
loader and vt successfully operate in 800x480 mode. Note that config.txt is
parsed by the convoluted set of R-Pi bootloaders, before anything related to
FreeBSD (or Raspbian) is executed.

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