Uploading file to TFTP/PXE does not work ?

[npf]

pneyron@fgrenoble:~$ kareboot3 -x vmlinuz-3.16.0-4-amd64,initrd.img-3.16.0-4-amd64
No node is chosen

If I pass -m 'machine, the machine reboots...

[petitalb]

Never use the -x option but with the -w option, you have to add -r set_pxe to update the PXE. Is it the same with -x?