PXE network boot with grub2, root variable empty

[Ginta]

I was running syslinux for network booting, configured tftp and dhcp correctly. Everything runs correctly, and I can boot from network, but I now I am trying to do the same and replace syslinux in favor to grub2.

I therefore ran the command: grub-mknetdir --net-directory=/warehouse/TFTProot/ and modified the file to send in dhcpd.conf

grub starts from network, but it complains about missing root variable, and enters in rescue mode.

I realized that there are some basic variables empty: prefix, pxe_default_server, root.

I looked all over the internet and did not find any way to set them, and it does not even read the grub.cfg file, so I have no idea what is happening here.

Is this a bug, or did I miss something in server's config? I would like some advice as every pages I looked around do not say anything about this.

Thanks

EDIT:

Inside grub rescue (on the client, once booted with PXE), I can manually type:

[gerdesj]

Do you have a particular reason for migrating from syslinux to grub2 for network boot?

If not then I would revert, if so I would find the support system provided by grub2 and ask your question there.

[Ginta]