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| − | ==Before you begin==
| + | #REDIRECT [[Novena linux-kernel]] |
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| − | The build environment should not be on an encrypted partition. These tend to have much lower path lengths, which can break the build in mysterious and hard-to-track-down ways.
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| − | You should not use have a symlink in the path of the build system. This can also break things.
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| − | ==Setting up the environment==
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| − | To set up the environment, first you must fetch the repos, then you must perform initial, one-time configuration. All of these steps only need to be run the first time you set up your build environment.
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| − | ===Fetching source code===
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| − | There are two approaches you can take to set up the environment: From-scratch, or with a quickstart package. The quickstart method should save you a day or two, as downloading the kernel and webkit sources can take a very long time – on the order of days.
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| − | ====From scratch====
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| − | Note that these steps are very similar to the generic [http://www.angstrom-distribution.org/building-angstrom Building Angstrom] steps.
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| − | #* git clone https://github.com/sutajiokousagi/setup-scripts oe
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| − | #* cd oe
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| − | ===Configure the build environment===
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| − | First, perform initial setup. This creates an environment file you'll use every time you want to do development.
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| − | # Configure OE
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| − | #* ./oebb.sh config novena
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| − | #* ./oebb.sh update
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| − | Next, edit conf/local.conf. Particularly important variables you might want to changeg are:
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| − | * PARALLEL_MAKE – This tells "make" how many threads to spawn. A good rule of thumb is 1.5 times the number of cores present. Be sure to include "-j" before the number.
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| − | * BB_NUMBER_THREADS – This tells bitbake how many tasks to run at parallel. Set this equal to around the number of cores present.
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| − | ==Building an image==
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| − | Set up your session by sourcing the OE environment file:
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| − | . ~/.oe/environment-oecore
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| − | There are many images available. To list them all, run:
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| − | find sources/meta-* sources/openembedded-core -name '*image*.bb'
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| − | There is a Novena bringup image that contains many useful system tools for determining system performance, communicating with various peripherals, and generally bringing up the system. To build this image, run:
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| − | bitbake novena-bringup-image
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| − | ==Troubleshooting==
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| − | * Bitbake failure when downloading the kernel
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| − | There is an issue with the long-running <tt>git fetch</tt> that bitbake does when it first pulls down the kernel source code. The error looks like:
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| − | ERROR: Fetcher failure: Fetch command ...
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| − | Cloning into bare repository ...
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| − | To work around this, manually run the command listed and then retry the bitbake command.
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| − | ==Writing an image to a card==
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| − | When an image is built, various files are added to the deploy/images/novena/ directory. The image name is embedded within the resulting compressed ROM file. For example, the image for novena-bringup-image is located at oe/build/tmp-angstrom_2010_x-eglibc/deploy/images/novena/rom-novena-hw-bringup.img.gz.
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