Buildroot
Root file system images , which are the final results , may be built using various file systems , including cramfs , JFFS2 , romfs , SquashFS and UBIFS . 
<triplet> cramfs <subj> file system <obj> instance of <triplet> romfs <subj> file system <obj> instance of <triplet> SquashFS <subj> file system <obj> instance of <triplet> UBIFS <subj> file system <obj> instance of