@Kulitorum:
Rmpfh….
Still does not compile, and I have no idea what _sbrk is:
22:45:17 **** Incremental Build of configuration DuetWiFi for project RepRapFirmware ****
make all
'Building target: DuetWiFiFirmware.elf'
'Invoking: Cross G++ Linker'
arm-none-eabi-gcc -L"C:\Eclipse\ReprapFirmware\CoreNG\SAM3X8E" -Os -Wl,--gc-sections -Wl,--fatal-warnings -mcpu=cortex-m4 ...
Your library path is wrong. For the Duet WiFi build of RRF, you should be using the SAM4E build of CoreNG, not the SAM3X8E one.