Linux in-system Polarfire FW update tool via SPI slave mode

[SpaceTeddy]

Dear fans,
I use a Polarfire FPGA in an embedded Linux environment and I would like to perform an in-system FW update via SPI slave mode update . This is mentioned in chapter 3.2 of the PolarFire® FPGA and PolarFire SoC FPGA Programming
User Guide Doc. DS50003191A

Is there already a lightweight Linux command line tool available which I can use? I guess that SPI-DirectC may be the key, but this is for low level MCU and probably somebody has ported this to embedded Linux already. Thanks a lot
Chris