PetaLinux generates the dtsi & dts using the XSA for all hardware present in the design (typically the static region). Any additional IPs not described in the XSA such as dynamically loaded or partially reconfigured and when parameters needs modification then, those must be added manually in system-user.dtsi.
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Please find the detailed product information here:
Zynq™ UltraScale+™ ZU19/ZU17/ZU11 MPSoC System on Module