Fix build script

Author: facchinm

bootloaders/build.sh

@@ -1,11 +1,18 @@
-if [ $AVR_GCC_PATH == "" ]; then
+#!/bin/bash
+
+if [ x$AVR_GCC_PATH == x"" ]; then
 AVR_GCC_PATH=/bin/
 fi
 
+echo Compiling
 ${AVR_GCC_PATH}/avr-gcc -c -g -Os -w  -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -Wl,--gc-sections -w -mmcu=atmega4809 -DF_CPU=16000000L boot.c -o boot.o
 ${AVR_GCC_PATH}/avr-gcc  -g -Os -w  -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -nostartfiles  -Wl,--gc-sections  -w -mmcu=atmega4809 -DF_CPU=16000000L boot.o -o boot.elf
 
-${AVR_GCC_PATH}/avr-objcopy -O binary -R .fuses boot.elf boot.bin
+echo Extracting bin
+${AVR_GCC_PATH}/avr-objcopy -O ihex -R .fuses boot.elf boot.hex
 #${AVR_GCC_PATH}avr-objcopy -O binary -j .fuses --set-section-flags=.fuses=alloc,load --no-change-warnings --change-section-lma .fuses=0 boot.elf boot.fuses
 
+echo Moving hex
+mv boot.hex atmega4809_uart_bl.hex
+
 ${AVR_GCC_PATH}/../avrdude/6.3.0-arduino14/bin/avrdude -C${AVR_GCC_PATH}/../avrdude/6.3.0-arduino14/etc/avrdude.conf -v -patmega4809 -cxplainedmini_updi -Pusb -Ufuses:w:boot.fuses:r  -Uflash:w:boot.bin:r