I apologize for giving you bad information previously. Zynq devices do not support QSPI readback with Hardware Manager. The best advice that I could find was on the Xilinx forums here:
Unfortunately, no specific U-boot commands were shared, so I did a little experimenting with a MicroZed that I have here. I loaded up the Linux pre-built image onto an SD Card from the Avnet BSP, then booted from SD Card, making sure to interrupt at the U-boot stage. After that, then the commands that I followed were:
sf probe 0 0 0
sf read 0x08000000 0 0x1000000
fatwrite mmc 0 0x08000000 boot_qspi.bin 0x1000000
fatls mmc 0
Where
0x08000000 is a location in DDR to temporarily store stuff
