In 2022.2 release, yocto machine conf files were in PetaLinux tool.
/opt/petalinux-v2022.2-final/components/misc/yocto_machines/
avnet-digilent-zedboard.conf xilinx-k26-kv.conf xilinx-ultra96-reva.conf xilinx-vek280.conf xilinx-zc702.conf xilinx-zcu1275.conf
eval-brd-sc.conf xilinx-k26-som.conf xilinx-vck190.conf xilinx-vhk158.conf xilinx-zc706.conf xilinx-zcu1285.conf
xilinx-ac701.conf xilinx-kc705.conf xilinx-vck190-sc.conf xilinx-vmk180.conf xilinx-zcu102.conf xilinx-zcu208.conf
xilinx-k24-kd.conf xilinx-kcu105.conf xilinx-vck5000.conf xilinx-vpk120.conf xilinx-zcu104.conf xilinx-zcu216.conf
xilinx-k24-som.conf xilinx-kcu105-tmr.conf xilinx-vc-p-a2197-00.conf xilinx-vpk180.conf xilinx-zcu106.conf xilinx-zcu670.conf
xilinx-k26-kr.conf xilinx-sp701.conf xilinx-vcu118.conf xilinx-zc1751-dc1.conf xilinx-zcu111.conf
From 2023.1 release, PetaLinux is not maintaining any static machine conf files.
This is generated dynamically, and it is available in the machine conf file located in
<plnx-proj>/build/conf/machine
based on
xsa.