No space left on device (http://ipxe.org/34182006)

[NiKiZe]

Which of the nfs:// chain lines (kernel / initrd) is it that fails?
iPXE can be built in a few different ways, and for different platforms, so it would be relevant to include the filename of the iPXE binary, or how you built it.
I'm guessing that you are using ipxe.lkrn or undionly.kpxe ? (and that it is built for 32 bit and not 64 bit)

please note that imgargs will replace what was given on the kernel line, you might want to change that and only use arguments on kernel or imgargs

do you also have the filesize of the 2 files being downloaded?