redpitaya-puzzlefw/sw/buildroot_overlay/etc/init.d/S90program_fpga.sh

#!/bin/sh
#
# Load FPGA firmware from SD card and program FPGA.
#

FIRMWARE_FILE="puzzlefw_top.bit.bin"

start() {

    # If firmware is not on rootfs, copy it from the SD card.
    if [ ! -f /lib/firmware/$FIRMWARE_FILE ]; then

        mkdir -p /lib/firmware

        mkdir -p /mnt/tmp_sdcard
        mount -t vfat -o fmask=0177 -r /dev/mmcblk0p1 /mnt/tmp_sdcard

        if ! cp /mnt/tmp_sdcard/$FIRMWARE_FILE /lib/firmware ; then
            echo "ERROR: Failed to copy FPGA firmware from SD card" >&2
        fi

        umount /mnt/tmp_sdcard
        rmdir /mnt/tmp_sdcard

    fi

    # Check that firmware is in place.
    if [ ! -f /lib/firmware/$FIRMWARE_FILE ]; then
        echo "ERROR: FPGA firmware not found" >&2
        exit 1
    fi

    # Drive internal GPIO line 0 low to reset FPGA.
    # Note: EMIO GPIO line n is gpio (n + 54) in Linux.
    gpioset 0 54=0

    # Drive internal GPIO line 2 high to enable ADC duty cycle stabilizer.
    gpioset 0 56=0

    # Program FPGA.
    echo "Programming FPGA ..."
    echo 0 > /sys/class/fpga_manager/fpga0/flags
    echo $FIRMWARE_FILE > /sys/class/fpga_manager/fpga0/firmware

    # Wait until FPGA programmed.
    sleep 5

    # Drive internal GPIO line 0 high to release FPGA reset.
    gpioset 0 54=1
    sleep 1
}

case "$1" in
  start)
    start
    ;;
  stop|restart|reload)
    ;;
  *)
    echo "Usage: $0 start"
    exit 1
esac