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==========
Gentoo ARM
==========
Drivers and misc for Gentoo on various ARM devices, for Chromebook, Trimslice
diskless, udoo/wandboard, beagleboneblack, allwinner a-10, and rpi. Some
of the relevant/current graphics configs are documented below.
To get started, add the overlay to make.conf, update package.foo and USE
flags as needed, and mask packages as needed. The general config is:
* ACCEPT_KEYWORDS="~arm"
* Basic config: udev, polkit, consolekit, xattr, caps, pam (no systemd or logind)
* X support: xwayland, opentegra, fbturbo, armsoc, rpi (still in testing)
* wayland/weston: egl/gles1/gles2, -opengl -glx (except a few odd packages with opengl flag)
* Needs package.foo configs for complete install (depends on usage)
* Kernels sources:
- Trimslice: gentoo-sources latest
- RaspberryPi: fbtft drivers now in Adafruit staging
+ raspberrypi-sources
+ adafruit-raspberrypi-sources
+ drm-raspberrypi-sources (provisional vc4 drm support)
- Wandboard-quad and Udoo-quad: `RCN LinuxOnArm`_ patches on mainline
+ latest 4.1.y mainline branch
- BeagleboneBlack: RCN bb_kernel patches on mainline
+ bone-sources updated to 4.1.0-bone9
+ see `RCN LinuxOnArm`_ for latest updates
- Chromebook: next dev branch beyond stock Google ChromeOS (custom config, installed as KERN3, USB3 rootfs or SDCard)
+ Samsung Snow - 3.8.11 chromeos-sources
+ Tegra K1 - 3.10.18 chromeos-sources
- Jetson K1 - 3.19.0-rc6 linux-jetson
- Efikamx: "Latest" upstream kernel, custom config (2.6.31.14.27-efikamx) external ASIX module, SDCard rootfs
- MK802-II 1 GB: "Latest" upstream kernel with correct device tree (3.4.75.sun4i+), custom config, SDCard rootfs
.. _RCN LinuxOnArm: http://eewiki.net/display/linuxonarm/Home
Steev's test setup:
(other) Steve's test setup:
* Hardware: Jetson, Trimslice, Wandboard quad, Chromebooks (snow and K1), Raspberry Pi B/B+/B2, Udoo quad, Cubox quad, BeagleboneBlack
- Full X is only built for all of them (so far) with wayland/weston testing in progress)
+ gles/egl, no opengl/glx, cairo/clutter/cogl, +qt5/-qt4, +gtk3/-gtk
* Overlays:
- https://github.com/sarnold/portage-overlay (general)
- https://github.com/sarnold/arm (pushes to gentoo/arm)
* Recommended CPU flags
- armv7 defaults: -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard
+ add neon to USE flags if processor supports it, ebuilds that use neon should take care of flags
- alternately you can set fpu to one of the neon-vfp flags
+ Example flags for Tegra K1:
+ -march=armv7-a -mtune=cortex-a15 -mfpu=neon-vfpv4 -mfp16-format=ieee
* Configs: See the config directory in arm overlay for test configs
Config differences are minimal, mainly graphics and neon. Webkit-gtk builds with everything but jit, the cairo gles backend is enabled instead of opengl, and Trimslice uses opentegra-specific repos and mesa-9999.
You can (optionally) add this overlay with layman::
$ layman -f -a arm_support -o https://raw.github.com/gentoo/arm/master/configs/layman.xml
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