On 5/13/2015 9:35 PM, Wookey wrote: > +++ Ganesan, Aravind [2015-05-13 20:58 -0600]: >> On 5/13/2015 7:12 PM, Wookey wrote: >>> +++ Ganesan, Aravind [2015-05-13 18:35 -0600]: >>>> Hi Guys, >>>> I have two questions: >>>> (1) I have download gcc-4.9 tool chain from >>>> http://releases.linaro.org/14.08/components/toolchain/binaries. >>>> The kernel for the release >>>> (http://releases.linaro.org/14.08/components/kernel/linux-linaro) is >>>> 3.16. So can we assume the kernel headers found in the tool chain >>>> installation from the link above belongs to linux version 3.16? >>>> >>>> (2) Also, I ubuntu wiki indicates that starting with Ubuntu 12.04 they >>>> are using linaro gcc packages for arm64 >>> >>> Not linaro packages directly, but the same source tree/patch set. >>> >>>> (https://wiki.ubuntu.com/ToolChain). Is there an easy way to find what >>>> linaro-release (for tool chain) will be compatible with Ubuntu 14.10 >>>> aarch64 image? >>> >>> If building on Ubuntu it's much easier to use the ubuntu-packaged >>> toolchains (or cross-toolchains) which should function just the same >>> but have multiarch enabled and be properly packaged. >>> >>> That should make your Q1 moot as you the kernel-headers are a separate >>> package from the cross-toolchain and normal package-management tools >>> will make it obvious what versions are available/installed. >>> >>> You only want to try using a linaro toolchain release directly if >>> there is some super-recent feature that you need, but which hasn't yet >>> made it into the Ubuntu toolchain (they will always be somewhat behind >>> 'current' especially if building on stable). >>> >> Thanks Wookey. I'm developing on a X86_64 machine runningUbuntu-12.04 >> (which, AFAIK, doesn't have aarch64 toolchain) . > > Correct - that appeared in 14.04 > >> I'm trying to find a >> cross-compilation tool-chain for building Linux kernel and applications >> targeting a qemu-aarch64 machine-emulation running Ubuntu 14.10. > > Build in a 14.04 chroot, and thus use 14.04 toolchain, and libraries. > > Use any of debootstrap, or sbuild-createchroot or the ubuntu-specific > mksbuild to make at 14.04 chroot. > > You can either make a qemu arm64 chroot and native-build in it, or > make an amd64 chroot and cross-build in it. > > This tells you how make a qemu-ready arm64 chroot (adjust instructions > debian-> ubuntu) https://wiki.debian.org/Arm64Port#Debootstrap_arm64 > > This tells you how to make an amd64 chroot: > https://help.ubuntu.com/community/DebootstrapChroot > I prefer to use sbuild-createchroot because it does all those sbuild > config runes for you (and can make a tarball chroot for clean builds > every time). > > sbuild-createchroot --components=main,universe > --make-sbuild-tarball=/srv/chroots/precise-cross-buildd.tgz precise > /srv/chroots/precise http://archive.ubuntu.com/ubuntu/ > sbuild-adduser <your-username> > > > Contents > > Cross Compiling using Multi-Arch > Preparing multiarch chroot > Manually preparing multiarch chroot > Multiarch cross-building requirements > Crossbuilding requirements > Cross toolchain > Cross > pkg-config support > dpkg-cross support > Environment variables > Adding qemu support > Configuring dpkg > Installing > cross-build deps > Running the build > Cross Compiling examples > Steps to proceed from here > > Cross Compiling using Multi-Arch > > This page details what is required to do > multiarch crossbuilding. If you just want to use it then read > 'Preparing multiarch chroot'. The building itself is trivial (sbuild > does all the work), the intial chroot setup is most of it. You can do > cross-builds without setting up a chroot, but it is not recommended > because it puts a lot of guff in your system and mulitarch problems > are much more likely on a more fully-populated system. > > Preparing multiarch chroot > > There is now a helper script to do the work dsescribed below (in > xbuilder 0.8) so if you just want to make a cross-build chroot and use > it this is the way to do it. This currently assumes Ubuntu, and would > need some minor adjustements for Debian (changing the /etc/apt/sources > in the chroot because of the different archive layout). > > Install xbuilder 0.8 from the Linaro cross-tools PPA > > apt-add-repository ppa:linaro-foundations/cross-build-tools > apt-get update > apt-get install xbuilder > > Setup the chroot > > xbuild-chroot-setup precise /srv/chroots/precise-cross > > You can optionally specify a mirror with --mirror, and to set up qemu > in the chroot using --with-qemu > > xbuild-chroot-setup precise /srv/chroots/precise-cross --with-qemu > --mirror=http://localhost:3142/ubuntu > > That's it. Easy peasy. > > Do builds in the chroot created with: > > sbuild --host=<arch> -d <suite> -c <suite>-<build-arch>-sbuild <package> > > e.g. > > sbuild --host=armhf -d precise -c precise-amd64-sbuild <package> > > (If you don't have lots of chroots already then you can skip the -c > and sbuild will probably pick the right one) > > Note that the chroots are set up with sbuild-createchroot so if you've > already used that for this particular suite then you'll end up with > two named the same and schroot will sulk. Just rename one in > /etc/schroot/chroot.d/<suite>-amd64-sbuild-xxxxx (The name is the bit > in square brackets on the top lione of the config). > > Manually preparing multiarch chroot > > Below full details are given of what is actually required. Here is the > short version of what to type if you just want to set up a suitable > environment and do manual builds. See CrossBuildd for setting up an > automated system. > > add-apt-repository deb > http://ppa.launchpad.net/linaro-foundations/cross-build-tools/ubuntu > precise main > apt-get update > apt-get install sbuild schroot qemu-user-static > > For testing, you will want a precise or later (ubuntu) or wheezy or > later (debian) chroot. Raring works best at the moment (May 2013). > > sbuild-createchroot --components=main,universe > --make-sbuild-tarball=/srv/chroots/trusty-cross-buildd.tgz trusty > /srv/chroots/trusty http://archive.ubuntu.com/ubuntu/ > sbuild-adduser <your-username> > sbuild-update --keygen > > more details on > https://wiki.linaro.org/Platform/DevPlatform/CrossCompile/UsingMultiArch#Manually_preparing_multiarch_chroot > > HTH > > Wookey > I appreciate you taking the time, thank you Wookey.
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