The file is cmdline.txt, open it with a text editor (I suggest Notepad++) and edit it, make sure everything is on 1 line.were do i put this file boot=/dev/mmcblk0p1 disk=/dev/mmcblk0p2 ssh quiet,thanks mickh
Everything but the SYSTEM-file needs to be on SD.
SYSTEM-file can be on SD/USB/SMB/NFS, if you have SYSTEM on USB/SMB/NFS you need to specify it's location in cmdline.txt.
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