I got this "feature" on <a href="https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841883/Yocto" target="_blank" rel="noopener">Yocto project of Xilinx</a> rel-v2022.1 (honister). It seems to me my Linux kernel uses SHA-512 in default because after my first password change i could se the ident number of this encryption in <a href="https://www.cyberciti.biz/faq/understanding-etcshadow-file/" target="_blank" rel="noopener">/etc/shadow</a>. For all of my pre-made users from Yocto recipes if they had SHA-256 password hash, in first login it was forced to change. I could solve it after that i realizedm my Linux build likes to generate SHA-512 password has in run-time.