Toolchain

#Building the toolchain

Install needed dependencies (as root)

32-Bit Debian (Linux)

apt-get install git autoconf build-essential gperf bison flex texinfo libtool libncurses5-dev wget gawk libc6-dev-amd64 python-serial libexpat-dev
mkdir /opt/Espressif
chown $username /opt/Espressif/

64-bit Debian (Linux)

apt-get install git autoconf build-essential gperf bison flex texinfo libtool libncurses5-dev wget gawk libc6-dev-i386 python-serial libexpat-dev
mkdir /opt/Espressif
chown $username /opt/Espressif/

(replace $username with the name of the local user)

Windows

By zoutepopcorn.

• Use Python 2.7, not Python 3: https://www.python.org/downloads/
• Install pyserial-2.7: http://pyserial.sourceforge.net/pyserial.html

##Install the Xtensa crosstool-NG (as local user) A big thanks to jcmvbkbc for making GCC and crosstool-NG work with the Xtensa call0 ABI!

cd /opt/Espressif
git clone -b lx106 git://github.com/jcmvbkbc/crosstool-NG.git 
cd crosstool-NG
./bootstrap && ./configure --prefix=`pwd` && make && make install
./ct-ng xtensa-lx106-elf
./ct-ng build
PATH=$PWD/builds/xtensa-lx106-elf/bin:$PATH

If you install crosstool-NG outside of the build directory (by changing --prefix above), you need to copy local-patches/ and overlays/ to <prefix>/lib/ct-ng.1.20.0/

Note the default xtensa-lx106-elf configuration installs the compiler in ${CT_TOP_DIR}/builds/${CT_TARGET}, not under x-tools/.

#Setting up the Espressif SDK

• Download the ZIP file from http://bbs.espressif.com/viewtopic.php?f=5&t=72.
• Extract the contents to /opt/Espressif/ESP8266_SDK/.
• Move the (ZIP-bombing) License file into the right directory.

cd /opt/Espressif
mkdir ESP8266_SDK
wget -O esp_iot_sdk_v0.9.3_14_11_21.zip http://bbs.espressif.com/download/file.php?id=72
wget -O esp_iot_sdk_v0.9.3_14_11_21_patch1.zip http://bbs.espressif.com/download/file.php?id=73
unzip esp_iot_sdk_v0.9.3_14_11_21.zip
unzip -o esp_iot_sdk_v0.9.3_14_11_21_patch1.zip
mv esp_iot_sdk_v0.9.3 ESP8266_SDK
mv License ESP8266_SDK/

##Patching

• We use another toolchain.
• The IoT_Demo Makefile assumes it's one directory up (for libraries and linker script).

cd /opt/Espressif/ESP8266_SDK
sed -i -e 's/xt-ar/xtensa-lx106-elf-ar/' -e 's/xt-xcc/xtensa-lx106-elf-gcc/' -e 's/xt-objcopy/xtensa-lx106-elf-objcopy/' Makefile
mv examples/IoT_Demo .

#Installing Xtensa libraries and headers

cd /opt/Espressif/ESP8266_SDK
wget -O lib/libc.a https://github.com/esp8266/esp8266-wiki/raw/master/libs/libc.a
wget -O lib/libhal.a https://github.com/esp8266/esp8266-wiki/raw/master/libs/libhal.a
wget -O include.tgz https://github.com/esp8266/esp8266-wiki/raw/master/include.tgz
tar -xvzf include.tgz

These are binary libraries from the Xtensa SDK. You can also build them from source, but this has not yet been tested fully:

• lx106-hal and
• newlib-xtensa

#Installing the ESP image tool Download the deb for esptool from the Git repo or get the source and build yourself. Also available as a Git repository for online browsing.

cd /opt/Espressif
wget -O esptool_0.0.2-1_i386.deb https://github.com/esp8266/esp8266-wiki/raw/master/deb/esptool_0.0.2-1_i386.deb
dpkg -i esptool_0.0.2-1_i386.deb

#Installing the ESP upload tool

cd /opt/Espressif
git clone https://github.com/themadinventor/esptool esptool-py
ln -s $PWD/esptool-py/esptool.py crosstool-NG/builds/xtensa-lx106-elf/bin/

Next step: Building