universal-it-systems / arm

Drivers and misc for various ARM devices

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

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