f73f0df88a
Bug: 826218 Change-Id: I176e1aeb0b24b21c6b4e5ee40910dce2bce52c95 Reviewed-on: https://chromium-review.googlesource.com/1239461 Reviewed-by: Nico Weber <thakis@chromium.org> Commit-Queue: Daniel Bratell <bratell@opera.com> Cr-Commit-Position: refs/heads/master@{#593522}
104 lines
2.9 KiB
Markdown
104 lines
2.9 KiB
Markdown
# Linux Chromium Arm Recipes
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[TOC]
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## Recipe1: Building for an ARM CrOS device
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https://sites.google.com/a/chromium.org/dev/developers/how-tos/-quickly-building-for-cros-arm-x64
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## Recipe2: Explicit Cross compiling
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Due to the lack of ARM hardware with the grunt to build Chromium native, cross
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compiling is currently the recommended method of building for ARM.
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These instruction are designed to run on Ubuntu Precise.
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### Installing the toolchain
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The install-build-deps script can be used to install all the compiler
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and library dependencies directly from Ubuntu:
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$ ./build/install-build-deps.sh
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### Installing the sysroot
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A prebuilt sysroot image is kept up to date on Cloud Storage. It will
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automatically be installed by gclient runhooks if `target_cpu=["arm"]`
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is present in your `.gclient` file.
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To install the sysroot manually you can run:
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./build/linux/sysroot_scripts/install-sysroot.py --arch=arm
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### Building
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To build for ARM, using the clang binary in the chrome tree, use the following
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gn args:
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target_cpu = "arm"
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## Testing
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### Automated Build and Testing
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Chromium's testing infrastructure for ARM/Linux is somewhat limited.
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There are currently two builders setup, one on the FYI waterfall and one
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the the try bot waterfall:
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* [Linux ARM](https://build.chromium.org/p/chromium.fyi/builders/Linux%20ARM)
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* [linux_arm](https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_arm)
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These bots run x86-64 linux and cross-compile the ARM targets. Tests are
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run on ARM hardware via swarming.
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### Testing with QEMU
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If you don't have a real ARM machine, you can test with QEMU. For instance,
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there are some prebuilt QEMU Debian images here:
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http://people.debian.org/~aurel32/qemu/. Another option is to use the rootfs
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generated by rootstock, as mentioned above.
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Here's a minimal xorg.conf if needed:
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```
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Section "InputDevice"
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Identifier "Generic Keyboard"
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Driver "kbd"
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Option "XkbRules" "xorg"
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Option "XkbModel" "pc105"
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Option "XkbLayout" "us"
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EndSection
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Section "InputDevice"
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Identifier "Configured Mouse"
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Driver "mouse"
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EndSection
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Section "Device"
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Identifier "Configured Video Device"
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Driver "fbdev"
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Option "UseFBDev" "true"
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EndSection
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Section "Monitor"
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Identifier "Configured Monitor"
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EndSection
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Section "Screen"
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Identifier "Default Screen"
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Monitor "Configured Monitor"
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Device "Configured Video Device"
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DefaultDepth 8
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SubSection "Display"
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Depth 8
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Modes "1024x768" "800x600" "640x480"
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EndSubSection
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EndSection
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```
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### Notes
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* To building for thumb reduces the stripped release binary by around 9MB,
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equating to ~33% of the binary size. To enable thumb, set `'arm_thumb': 1`
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* TCmalloc does not have an ARM port, so it is disabled.
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