[arch-general] Grub installiert issue

[Frank Zimmermann]

I'm doing my first Arch install on an UEFI system and have troubles with GRUB. Following the instruction on the Wiki grub-mkconfig complained about a missing /boot/grub/grub.cfg.new.
So I manually created a grub.cfg file but when rebooting Grub says error: unknown file system. In rescue mode I type
set root=(hd0,gpt1)
set prefix=(0,1)/boot/grub
insmod normal
error: disk '0,1' not found
set prefix=(hd0,gpt1)/boot/grub
insmod normal
error: unknown filesystem
set prefix=(0,gpt1)/boot/grub
insmod normal
error: disk 0,gpt1 not found

My efi partition is the first partition on the first ssd. 
I think I did all I found on the Wiki and search on the web but am lost now with generating the grub.cfg

Any hints please?

Frank