Support for KC705?

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Dose this repo support for Xilinx's kc705? I want to port keystone to kc705. After build rocket core's bitstream for kc705,I follow keystone doc's instruction to bulid keystone and follow https://github.com/keystone-enclave/keystone/tree/master/sm to build the bootloader firmware with Keystone security monitor using OpenSBI's out-of-tree platform build. Then I follow the steps of https://github.com/keystone-enclave/keystone/blob/master/KEYSTONE-FPGA.md to prepare keystone bootable SD Card,partition the SD card and add the fw_payload.bin,fw_dynamic.bin generated in sm.bulid to the corresponding area. Then insert the SD card on kc705 and power up, there is an error : "Cann't mount SD: Not a valid FAT volume ". I prepare the bootable SD Card step by step follows the description document. I want to know the reason of this error , how to make the sd card work and the right steps of porting keystone to kc705 . Can anyone help? Thanks!