Firmware release procedures: Difference between revisions

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===Cherry-Picking Changes into an Incremental Release===
===Cherry-Picking Changes into an Incremental Release===


Releases are normally built from the top of the svn tree, but there are cases where it is necessary to build from an older base version with a few "cherry-picked" changes from later checkins. To see an example of how to do this, look at fc5:/home/firmware/q2d12/pullspecial . That script is a point replacement for the generic "pullme". It checks out a specific older version of the source tree, then merges in specific later versions of selected files.
Releases are normally built from the top of the svn tree, but there are cases where it is necessary to build from an older base version with a few "cherry-picked" changes from later checkins.

*identify the base SVN revision to use, and place it in a ''revision'' file before the ''pullme'' step,
*place patch files in the directory in strict naming order, each ending in .patch,
*run ''pullme'' and proceed as normal,


==Using PGP for EC code==
==Using PGP for EC code==

Revision as of 22:39, 24 January 2012

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Release procedure

EC Firmware

  • Quanta e-mails EC release and changelog to the OLPC BIOS contact, signed and encrypted with PGP
    • see notes below
  • Quanta and OLPC test this version of EC
  • When the new EC code has passed preliminary engineering tests, the OLPC firmware team (currently Mitch and Richard) puts it in http://dev.laptop.org/pub/ec/ .
  • NOTE: Due to personnel changes at Quanta, the EC development is currently (as of late Q4 '07)being done by Richard Smith OLPC, for all practical purposes. We may want to revise these EC release procedures to reflect that reality.

Wireless Firmware

  • Marvell sends new wireless firmware to OLPC.
  • The connectivity team evaluates it
  • If it passes muster, the connectivity team puts it in http://dev.laptop.org/pub/firmware/libertas/
  • The connectivity team announces/recommends it by sending email to the firmware and OS teams

Source Tree Stabilization

  • The OFW source repository is at svn://openbios.org/openfirmware
  • The firmware team develops and tests OFW changes with private (non-released) builds
  • Anyone can make a private test version by checking out the svn source tree and running "make" in cpu/x86/pc/olpc/build/
  • To select specific versions of EC and wireless firmware for inclusion in a build, edit cpu/x86/pc/olpc/versions.fth .
  • Private versions are tested by the firmware team and selected others, typically by issuing "brown bag" releases distributed from the engineer's public_html directory on dev.laptop.org
  • "Brown bag" private versions have names that are distinct from the normal release name schema. We add two letters to the previous release build. First letter is release engineer's name (r,m,p,d), second letter is a version (a-z).
  • "Real" release builds are only done after the firmware engineer is fairly certain that the most recent private version is solid and ready to be promoted to an official release.
  • Prior to a release build, the firmware release engineer (e.g. Mitch or Richard) ensures that all approved changes have been checked in to the repository and that cpu/x86/pc/olpc/versions.fth refers to the correct versions of EC and wireless firmware. He then builds a private version from the clean tree and tests it well.
  • As the final source maintenance step for a new build, the firmware release engineer edits cpu/x86/pc/olpc/versions.fth to set the firmware major and minor version strings to the new release number, then checks in the new version of that file.

Building a Release

The firmware release engineer follows these steps:

  • firmware releases are built on "koji2" for ARM, and "firmware" for x86, in in the directory "/home/firmware"
$ cd /home/firmware/
$ ./newrelease qNxNN
$ cd ../qNxNN

Skip this paragraph for new releases. For maintenance releases, create a file revision containing the SVN revision number to base the release on, and add a series of .patch files. These will be applied in order by pullme. 

$ ./pullme
$ ./buildme
  • Do a quick "brick test" of the roms/<version>.rom file prior to making it public. Typically that just involves flashing the .rom file into a machine and making sure that it boots. You might also run test-all and autorun-mfg-tests.
  • If something goes wrong, either a problem with the build process (e.g. a missing file that was not checked in properly) or a test failure on the .rom image, delete all copies of the .rom file, delete the new build directory, fix the source tree, and start over (this is not painful because ./pullme + ./buildme goes quickly).

Issuing the Release

  • After a clean build and a successful "brick test", make the release public with:
 $ ./releaseme

Validating the Release

  • OLPC testers install the new release on some number of systems at 1CC and perhaps other test sites
  • Assuming that the testing goes well, the ECO team sends mail to Quanta approving the use of the new release in production

Withdrawing a Release

If a dangerous bug is found in a release, it can be withdrawn. A dangerous bug is one that potentially results in bricked systems. To withdraw a release:

Cherry-Picking Changes into an Incremental Release

Releases are normally built from the top of the svn tree, but there are cases where it is necessary to build from an older base version with a few "cherry-picked" changes from later checkins.

  • identify the base SVN revision to use, and place it in a revision file before the pullme step,
  • place patch files in the directory in strict naming order, each ending in .patch,
  • run pullme and proceed as normal,

Using PGP for EC code

For first release only: This is already done

Download and install GPG4Win from http://www.gpg4win.org/download.html

Create a PGP key and get dwmw2 to sign it to verify that it is Quanta's.

For subsequent releases

Right-click on the EC binary and select the option to create a "detached signature", in plain text. It should create a separate file like 'ECv21.bin.asc', which looks something like this: 

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (MingW32)

iD8DBQBFTxvGmfQ2bFM/BesRAoKzAJ0RNczipB pul5sEUR wCYIQvt /wCguqrV
5GRPVDpdH155fwsDwnu7B4M=
=URby
-----END PGP SIGNATURE-----

Send the EC binary as you normally would, and _also_ attach the separate signature file which is used to verify the binary. There is no need to send another copy of the key itself (0x533F05EB.asc), because we already have that.

Send the EC binary and signature (2 attachments) to software-team@laptop.org

This page needs clean-up and editing for coherence, clarity, and completeness.

Please improve this article if you can.

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