board/beagleboard/beaglev_fire: cleanup gatewate update

Update the README following the update gateware fix and optimise the
script, making it easier for the user to use.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jamie Gibbons <jamie.gibbons@microchip.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>

board/beagleboard/beaglev_fire/README.txt

@@ -108,12 +108,12 @@ https://docs.beagleboard.org/latest/boards/beaglev/fire/demos-and-tutorials/gate
   Unzip the downloaded artifacts.zip file.
 
   Go to the custom FPGA design directory:
-    'cd artifacts/bitstreams/my_custom_fpga_design'
+    'cd artifacts/bitstreams/my_custom_fpga_design/LinuxProgramming/'
 
   On your Linux host development computer, copy the bitstream to BeagleV-Fire
   board, replacing </path/to/your/> with the path to your BeagleV-Fire root file
   system.
-    'cp -r ./LinuxProgramming /path/to/your/buildroot/board/beagleboard/beaglev_fire/rootfs-overlay/etc/'
+    'cp ./* /path/to/your/buildroot/board/beagleboard/beaglev_fire/rootfs-overlay/lib/firmware/'
 
   To apply these changes to your image, make sure to re-build it with:
     `make`
@@ -121,14 +121,7 @@ https://docs.beagleboard.org/latest/boards/beaglev/fire/demos-and-tutorials/gate
   Then, re-flash your image - to ensure you have the necessary firmware files - by
   following the above section "Flashing the image to your eMMC".
 
-  On BeagleV-Fire,
-    1. Make your update gateware script executable
-      'chmod +x /usr/share/microchip/update-gateware.sh'
-    2. Create a firmware directory
-      'mkdir /lib/firmware'
-    3. Change to the directory of your gateware script
-      `cd /usr/share/microchip/`
-    3. initiate the reprogramming of the FPGA with your gateware bitstream:
-      './update-gateware.sh /etc/LinuxProgramming/'
+  On BeagleV-Fire initiate the reprogramming of the FPGA with your gateware bitstream:
+    `/usr/share/microchip/update-gateware.sh`
 
   Wait for a couple of minutes for the BeagleV-Fire to reprogram itself.

board/beagleboard/beaglev_fire/rootfs-overlay/usr/share/microchip/update-gateware.sh

@@ -1,18 +1,25 @@
 #!/bin/sh
 
-if [ ! -e "$1"/mpfs_bitstream.spi ]; then
+if [ $# -eq 0 ]; then
+    echo "No gateware location provided. Checking default location."
+    if [ ! -e /lib/firmware/mpfs_bitstream.spi ]; then
         echo "No gateware file found."
         exit 1
+    fi
+else
+    echo "Gateware location provided: $1"
+    if [ ! -e "$1"/mpfs_bitstream.spi ]; then
+        echo "No gateware file found."
+        exit 1
+    else
+        if [ ! -d /lib/firmware ]; then
+            mkdir /lib/firmware
+        fi
+        cp "$1"/mpfs_dtbo.spi /lib/firmware/mpfs_dtbo.spi
+        cp "$1"/mpfs_bitstream.spi /lib/firmware/mpfs_bitstream.spi
+    fi
 fi
 
-if [ ! -d /lib/firmware ]
-then
-    mkdir /lib/firmware
-fi
-
-cp "$1"/mpfs_dtbo.spi /lib/firmware/mpfs_dtbo.spi
-cp "$1"/mpfs_bitstream.spi /lib/firmware/mpfs_bitstream.spi
-
 # Trash existing device tree overlay in case the rest of the process fails:
 flash_erase /dev/mtd0 0 16