Where can I find detailed documentation Cortex-A9 processors embedded in the Zynq-7000 device?
Most of the documentation provided by Xilinx is specific to first-party devices and tools.
In the case of Zynq, the Cortex-A9 is well documented by ARM. Questions about PS parameters and settings should be searched for in the following manner:
Below is a list of ARM documentation and the information that might be found in them: