Xilinx remove the compatible = "generic-uio" configuration in latest Kernel distribution ,if you want to use the uio function, you need to add environment variable in uEnv.txt.
bootargs = "console=ttyPS0,115200 earlyprintk uio_pdrv_genirq.of_id=generic-uio";
ref:
1.https://forums.xilinx.com/t5/Embedded-Linux/generic-UIO-broken/td-p/564259/page/2
2.https://github.com/Xilinx/linux-xlnx/commit/7ebd62dbc727ef343b07c01c852a15fc4d9cc9e5
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