Description of problem:


Version-Release number of selected component (if applicable):

Steps to Reproduce:
u=https://dl.fedoraproject.org/pub/fedora-secondary/development/rawhide/Server/aarch64/os/
wget -N $u/EFI/BOOT/grubaa64.efi $u/images/pxeboot/vmlinuz $u/images/pxeboot/initrd.img
echo "linux (tftp)/vmlinuz ip=enp1s0f0:dhcp ksdevice=enp1s0f0 inst.repo=$u
initrd (tftp)/initrd.img
boot" > grub.cfg

Network boot grubaa64.efi (I'm using dnsmasq for DHCP+TFTP connected to target NIC enp1s0f1).

Actual results:
Starting installer, one moment...
anaconda 26.1-1 for Fedora Rawhide (pre-release) started.
 * installation log files are stored in /tmp during the installation
 * shell is available on TTY2
 * if the graphical installation interface fails to start, try again with the
   inst.text bootoption to start text installation
 * when reporting a bug add logs from /tmp as separate text/plain attachments
18:25:36 X startup failed, falling back to text mode
================================================================================
================================================================================
VNC
  
X was unable to start on your machine.  Would you like to start VNC to connect
to this computer from another computer and perform a graphical installation or
continue with a text mode installation?

 1) Start VNC

 2) Use text mode

  Please make your choice from above ['q' to quit | 'c' to continue | 
  'r' to refresh]: 2
Traceback (most recent call last):
  File "/sbin/anaconda", line 1100, in <module>
    setupDisplay(anaconda, opts, addon_paths)
  File "/sbin/anaconda", line 574, in setupDisplay
    anaconda.instClass.configure(anaconda)
  File "/usr/lib64/python3.5/site-packages/pyanaconda/installclasses/fedora.py", line 39, in configure
    BaseInstallClass.configure(self, anaconda)
  File "/usr/lib64/python3.5/site-packages/pyanaconda/installclass.py", line 122, in configure
    anaconda.bootloader.boot_args.update(self.bootloaderExtraArgs)
AttributeError: 'Aarch64EFIGRUB' object has no attribute 'boot_args'

Pane is dead
AttributeError: 'Aarch64EFIGRUB' object has no attribute 'boot_args'
Pane is dead


Expected results:
Text installer works