Error when attempting to set dhcp option variable

[NiKiZe]

First i must ask what is ${ifname} and why are you not using netX instead?

Have you tried clearing the user-class before setting it?
But maybe you should check if it already is set and if so skip the extra dhcp step anyway?
Right now I don't have the time to dig much more, but will try to tomorrow if I remember.

If memory serves me right MEMMAP_SETTINGS is not an option relevant to EFI builds, only pcbios.