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boards/xtensa/esp32/esp32-core/README.txt: Update the toolchain installation help.

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Ouss4 2019-12-10 13:44:28 -06:00 committed by Gregory Nutt
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boards/xtensa/esp32/esp32-core/README.txt
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@ -86,18 +86,22 @@ ESP32 Toolchain
BSP. The steps to build toolchain with crosstool-NG on Linux are as
follows:
git clone -b xtensa-1.22.x https://github.com/espressif/crosstool-NG.git
git clone https://github.com/espressif/crosstool-NG.git
cd crosstool-NG
./bootstrap && ./configure --prefix=$PWD && make install
git checkout esp-2019r2
git submodule update --init
./bootstrap && ./configure --enable-local && make
./ct-ng xtensa-esp32-elf
./ct-ng build
chmod -R u+w builds/xtensa-esp32-elf
These steps are given in setup guide in ESP-IDF repository:
https://github.com/espressif/esp-idf/blob/master/docs/linux-setup.rst#alternative-step-1-compile-the-toolchain-from-source-using-crosstool-ng
export PATH="crosstool-NG/builds/xtensa-esp32-elf/bin:$PATH"
NOTE: The xtensa-esp32-elf configuration is only available in the
xtensa-1.22.x branch.
These steps are given in setup guide in ESP-IDF repository:
https://docs.espressif.com/projects/esp-idf/en/latest/get-started/linux-setup-scratch.html
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