You'll need USB 2.0 emulation for the USB ports to work. There is a way
to enable it on a MacBook:
https://gist.github.com/jcs/5573685#openbsd-booting.

On Tue, Jul 15, 2014, at 12:43 PM, Sevan / Venture37 wrote:
> On 24 October 2013 10:13, Jonathan Gray <[email protected]> wrote:
> > On Wed, Oct 23, 2013 at 10:53:49PM +0400, Sevan / Venture37 wrote:
> >> On 23 Oct 2013, at 12:53, "Alexey E. Suslikov" <[email protected]> 
> >> wrote:
> >>
> >> > Have you tried to disable [intel|ati]drm via boot config and
> >> > then proceed with installation?
> >>
> >> It's not possible as the prompt keeps on jumping back & forth between the 
> >> line which says UKC> & User Kernel Config.
> >>
> >> Sevan
> >
> > There are no drm drivers on the install media.
> > So the apple machines with eDP panels can't do vesa modes at all?
> > The bios interface those machines present seems to have many
> > problems, the ideal way of handling them is likely to support
> > booting via uefi and the associated framebuffer interface.
> 
> Just tried the latest amd64 snapshot on my mid-2012 11" air, the
> screen no longer goes blank anymore which is great as there's no
> longer a frantic rush to complete the install.
> Unfortunately the USB ports are not working so I can't proceed with an
> installation though.
> 
> 
> Sevan

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