bootx64.efi does not work

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Meanwhile I have solved the problem by myself. It is necessary to use the command grub2-mkstandalone to create a bootfile, which contains all grub2 modules. The fedora bootfile bootx64.efi works only for a boot process from a disk drive.

I have installed fedora version 19 on an UEFI system. As a result, the system contains all necessary grub2 efi build files under /usr/lib/grub/x86_64-efi and the command grub2-mkstandalone can find them.

But you have to use the option --modules to define the modules, which should be loaded automatically (e.g. tftp efinet efifwsetup).

grub2-mkstandalone -O x86_64-efi -o bootfile.efi --modules "tftp net efinet linux efifwsetup"

Only one thing is a little bit poor. The bootfile search only for the file grub.cfg in the /tftboot directory of my TFTP server.

Create a grub.cfg file in your /tftpboot directory and it works. You can use a line like this to boot your linux from network.

menuentry{"for me" linux $fw_path/your_kernel root=/dev/nfs }

$fw_path has a value like tftp,10.1.1.3