[Bug 193745] New: [uefi] fresh install of 2014-09-08 10.1-beta1 snapshot boots but has no console

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193745

            Bug ID: 193745
           Summary: [uefi] fresh install of 2014-09-08 10.1-beta1 snapshot
                    boots but has no console
           Product: Base System
           Version: 10.1-BETA1
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dch at skunkwerks.at

Created attachment 147441
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=147441&action=edit
dmesg_from_imac13-4_20140909_10.1beta1

# Objective

Boot to FreeBSD and see the console during boot on UEFI-only Apple iMac.

# Expected Result

beautiful lines of console bliss scroll merrily past until the joyous login
prompt appears; all celebrate.

# Actual Result

loader.efi gets us to:

Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
Start @ 0xffffffff802d89c0 ...

And then no further activity (flickering, output, anything) is seen.

However the system successfully boots and dmesg is attached. The method of
installation was slightly unconventional, using an existing OpenZFS-on-OSX
zpool and manually setting up zfs mountpoints before running the normal
CD-based installation, using
http://ftp.at.freebsd.org/pub/FreeBSD/snapshots/amd64/10.1-PRERELEASE/ from
2014-09-08.

# Configs:

## EFI FAT partition

- refind 0.8.3
- /EFI/FREEBSD/loader.efi copied from FreeBSD /boot/loader.efi
- /EFI/boot copied from FreeBSD /boot (includes kernel modules etc)
- loader.conf as follows:

```
kern.geom.label.disk_ident.enable="0"
kern.geom.label.gptid.enable="0"
kern.vty="vt"
zfs_load="YES"
vfs.root.mountfrom="zfs:zroot/root"
```

at the console, 
OK show
...
console=efi

if that's of use.

Setting `kern.vty="vt"` or not makes no difference.

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