We need a local FAT file system, the easiest thing is to plug in a local SD card. Do this and find the mount point.
eg /run/media/pgm/417B-5B97
build an image: ./deploy2sd /run/media/pgm/417B-5B97 z7io-acq400-511-20220525111647.tgz
mkenvimage -s 131072 -o uboot.env uEnv.txt
z7io_007> ./fpio_init.py --disable SPI_BUS 3 SPI_DEV 0 Disabling buffers ... All buffers disabled, exiting... z7io_007> ./fpio_init.py --mode app --dir in --buf 0 SPI_BUS 3 SPI_DEV 0