- You have to put Poseidon in the flashrom of the deneb.
There is a menu option in Luciferin to do this. It adds all poseidon files to the upload list.
- Next partition and format the USB stick like you would do with a normal harddrive. The device for usb massstorage devices is usbscsi.device.
- Install your system files to the USB stick. after that you can boot from the USB stick.
If your system doesn't boot and your usb stick can't be found in the boot menu, try to increase the startup-delay value of your usb stick in trident prefs.
edit: don't forget to reflash the deneb rom if you changed the startup-delay, or else there will be an old version of psdstackloader in the flashrom