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< Architectures‎ | ARM

Revision as of 15:23, 27 October 2011 by Dsd (talk | contribs)

This page aims to document and solidify the remaining steps in getting F15 built for both ARMv5 and ARMv7 in koji (and therefore available to users).

F15 strategy

ARMv7 has recently been the focus of build efforts with many thousands of packages now successfully built into stage3 and stage4. The plan is to move armv7 efforts into the same koji build farm as armv5. This introduces some challenges which are overcome in this strategy.

ARMv5 external build

ARMv5 must now build a package set that exactly matches that of ARMv7. The steps here are:

  1. Working toolchain (coordinated by fossjon and Chris Tyler)
    • This is now done.
  2. "Stage 4" build from a build farm (external to koji). There is hardware available for this, and we envision it to be a relatively straightforward process, largely thanks to the armv7 work that has been taking place.

When stage4 is ready and matching exactly for both architectures, the koji build can then start. Koji will be instructed to rebuild the exact stage4 package set, with the output builds going straight into koji.

Stage4 cleanup

It is essential that stage4 is pure: that it only consists of packages from mainline Fedora 15 scm. GA packages are preferred, but packages from later points in the 'f15' git branches can be built when they are needed to fix ARM-specific bugs and build blockers.

At the time of writing, stage4 includes a number of hacked packages (i.e. spec file modifications that were made to get ARM builds working that have not gone 'upstream' into f15). These must all be moved into stage3 and removed from stage4. Then they should be fixed properly, then rebuilt for stage4 from official scm sources. The fedora-arm community has a number of provenpackagers on hand who can commit the easy fixes, and the more complicated stuff should be resolved with assistance/oversight from package maintainers. In our F14 experience, package maintainers are generally very responsive to our efforts.

Such fixes must be made in the f15 branch of Fedora scm before fixed packages are built for stage4. It is not sufficient for them to be fixed only in F16 and/or rawhide. Similarly, when fixing f15 branches, please also make sure that f16 and rawhide branches are fixed. This will save us time when we move onto F16.

DJ Delorie is tracking the divergence from Fedora here:

Infrastructure preparation for armv7hl

As a new architecture, some core Fedora components must be updated to correctly support armv7hl.

  • koji: Dennis Gilmore is finishing and testing his patches
  • rpm: A simple patch is needed, which could be applied only on armv7hl builds. Looks like Dennis is planning to take care of this.
  • yum: Yum must be extended to learn how to detect which ARM ABI is in use. This work is pending.

F16+ strategy

The above approach of rebuilding the whole distro outside of koji on two architectures before getting koji to rebuild everything for the two architectures again is purely a one-off since we are adding an architecture (armv7) in the F15 cycle. The migration and building needed for F16 and onwards will be able to happen in much less complicated fashion, entirely inside koji.