I have compiled a Linux 32-bit toolchain (since I couldn't find it in the build.xml, nor guess the URL). Download: http://cdn.majenko.co.uk/esp/xtensa-lx106-elf-linux32.tgz ARMhf version is compiling at the moment. I'll provide a link for that too when it's done and packaged. Linux 32-bit esptool is up as well: http://cdn.majenko.co.uk/esp/esptool-0.4.4-linux32.zip And so is the ARMhf version: http://cdn.majenko.co.uk/esp/esptool-0.4.4-linux-armhf.zip <!--- @huboard:{"order":269.0,"milestone_order":269.0,"custom_state":""} -->