{"id":1697,"date":"2013-06-14T08:28:26","date_gmt":"2013-06-14T12:28:26","guid":{"rendered":"http:\/\/protofusion.org\/wordpress\/?p=1697"},"modified":"2013-06-14T08:37:26","modified_gmt":"2013-06-14T12:37:26","slug":"beaglebone-black-and-dtc","status":"publish","type":"post","link":"http:\/\/protofusion.org\/wordpress\/2013\/06\/beaglebone-black-and-dtc\/","title":{"rendered":"BeagleBone Black and DTC"},"content":{"rendered":"

\"BeagleBone<\/a><\/p>\n

Arch Linux ARM currently includes an unpatched version of dtc<\/em> (device tree compiler) which lacks the “@” option. If you want to enable additional UARTs, SPI, I2C, or just use GPIO without recompiling the bootloader, you need a patched version of dtc<\/em>. You can download the source code and manually patch\/compile, but to make this process easier I created a PKGBUILD which builds a patched version of dtc<\/em> from git. Grab the raw PKGBUILD after the break, or just run packer to install from the AUR<\/a>:<\/p>\n

packer -S dtc-git-patched<\/em><\/p>\n

Make sure you don’t have the vanilla version of dtc<\/em> installed, pacman will throw “file exists on filesystem” errors if it’s already installed from the standard repository.<\/p>\n

After installing dtc<\/em> you can easily mux pins with the flattened device tree. For more information on muxing pins and enabling UARTs, check out the hipstercircuits guide<\/a>.<\/p>\n

<\/p>\n

\r\n# Maintainer: Ethan Zonca <ethanzonca@ethanzonca.com>\r\n\r\npkgname=dtc-git-patched\r\npkgver=20130410\r\npkgrel=1\r\npkgdesc="Device Tree Compiler with Dynamic Symbols and Fixup Support Patch"\r\nurl="http:\/\/jdl.com\/software\/"\r\narch=('i686' 'x86_64' 'armv7h')\r\nlicense=('GPL2')\r\nmakedepends=('git')\r\n\r\n_gitroot='http:\/\/jdl.com\/software\/dtc.git\/'\r\n_gitname='dtc.git'\r\n\r\nbuild() {\r\n    msg 'Downloading dynamic symbols fixup patch...'\r\n    wget https:\/\/patchwork.kernel.org\/patch\/1934471\/raw\/ -O dynamic-symbols.patch\r\n    msg 'Connecting to GIT server...'\r\n\r\n    if [[ -d ${_gitname} ]]\r\n    then\r\n        cd ${_gitname}\r\n        git reset --hard HEAD\r\n        git pull -f\r\n        git clean -f\r\n    else\r\n        git clone ${_gitroot} ${_gitname}\r\n    fi\r\n\r\n    msg 'GIT checkout done or server timeout'\r\n}\r\n\r\npackage() {\r\n   cd ${_gitname}\r\n\r\n   # Revert to version that patch applies to\r\n   git reset --hard f8cb5dd94903a5cfa1609695328b8f1d5557367f\r\n\r\n   # Apply patch\r\n   git apply ..\/dynamic-symbols.patch\r\n   #    patch -Np1 -i ..\/dynamic-symbols.patch\r\n\r\n    make || return 1\r\n    make INSTALL=$(which install) DESTDIR=${pkgdir} PREFIX=\/usr install || return 1\r\n}\r\n<\/pre>\n

\nImage credit: Adafruit<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"
Arch Linux ARM currently includes an unpatched version of dtc (device tree compiler) which lacks the “@” option. If you want to enable additional UARTs, SPI, I2C, or just use GPIO without recompiling the bootloader, you need a patched version…<\/span><\/p>\n
Read more ›<\/a><\/div>\n
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