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BUILD.md

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+# Build
+Instructions are for a Linux environment supported by Yocto.
+
+To get the build OpenGlow/ForgeFIRM you need to have `repo` installed:
+
+## Install the `repo` utility:
+
+```console
+mkdir ~/bin
+curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
+chmod a+x ~/bin/repo
+PATH=${PATH}:~/bin
+```
+Add the following to the end of ```~/.bashrc``` to permanently add ```repo``` to your path:
+```console
+export PATH=~/bin:$PATH
+```
+## Download the BSP source:
+
+```console
+mkdir forgefirm
+cd forgefirm
+repo init -u https://github.com/ScottW514/forgefirm.git -b master -m default.xml
+repo sync
+```
+
+At the end of the commands you have all meta packages you need to build the basic firmware images.
+
+## Build the OpenGlow/ForgeFIRM image for factory control boards
+First time environment setup:
+```console
+(in forgefirm directory)
+MACHINE=glowforge DISTRO=forgefirm . setup-environment build
+bitbake forgefirm-image
+```
+Subsequent builds:
+```console
+(in forgefirm directory)
+. setup-environment build
+bitbake forgefirm-image
+```
+
+## Bootable Image:
+The bootable image can be found in ```forgefirm/build/tmp/deploy/images/```.
+
+It can be written directly to an SDCARD:
+```console
+(in forgefirm/build directory)
+cd tmp/deploy/images/glowforge
+sudo zcat forgefirm-image-glowforge.wic.gz | dd of=/dev/sdX bs=1M
+```