Yocto e-SDK contains minimal shared
state (sstate) cache. AMD hosts the full
petalinux-image-minimal sstate cache at https://petalinux.xilinx.com/sswreleases/rel-v2025.1/.
During petalinux-build, BitBake searches
for the sstate cache in https://petalinux.xilinx.com/sswreleases/rel-v2025.1/. If it
fails to find the sstate cache, BitBake builds it from scratch. sstate is signature
locked.
For a .bbappend file which you create
for any root file system component, you must add SIGGEN_UNLOCKED_RECIPES += "<recipe-name>" (for example, example, SIGGEN_UNLOCKED_RECIPES += "u-boot-xlnx" in
<plnx-proj-root>/project-spec/meta_user/conf/petalinuxbsp.conf.