https://support.xilinx.com/s/question/0D52E00006hpcZMSAY/mpsoc-apu-l2-cache-is-held-in-reset?language=en_US

• debug detailed config parameter in the FSBL

http://www.zynqnotes.com/mpsoc-apu-l2-cache-is-held-in-reset said

1. use --fpga xx.bit
2. source ps7_init.tcl
3. import code ps7_init
4. dow xx.elf mdr <mem-addr>