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Das U-Boot -- the Universal Boot Loader

Welcome to the Wiki area for cooperating on U-Boot development.

TIP Note: Documentation on how to use and develop U-Boot can be found at https://u-boot.readthedocs.io/.

U-Boot Release Cycle

The U-Boot projects attempts to maintain a fixed, predictable Release Cycle as follows:
  • We will have U-Boot releases at a fixed release interval of (approximately) every 3 months.
  • Under normal conditions the release date will be a Monday around mid-month.
  • Immediately following each release, there will be a "merge window" of normally 21 days, i. e. if the release was on a Monday, then the merge window will close on the Monday in the 3rd week after the release.
    While this merge window is open, new features can be added to the U-Boot source tree. Linus Torvalds explains here and there what the term "merge window" is supposed to mean.
  • After the merge window closes, no new features may be added to allow for a release candidate phase which is intended to fix bugs and regressions.

ALERT! Note: While we try to adhere to the release schedule, we will not hesitate and take the liberty to delay a release if there are good reasons, for example if there are known bugs or other technical reasons. The code will be released when it is considered ready without caring too much about the announced deadline.

ALERT! Note 2: Even though we follow Linux ways in may respects, there are differences in the actual procedures, which are documented in section "Development Process".

Version Numbers:

Starting with the release in October 2008, the names of the releases were changed from numerical release numbers without deeper meaning into a time stamp based numbering. Regular releases are now identified by names consisting of the calendar year and month of the release date. Additional fields (if present) indicate release candidates or bug fix releases in "stable" maintenance trees.

Examples:
U-Boot v2009.11     - Release November 2009
U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
U-Boot v2010.09-rc1 - Release candidate 1 for September 2010 release

Current Status:

  • U-Boot v2022.04 was released on Mon 04 April 2022.
  • The Merge Window for the next release (v2022.07) was closed on Mon 25 April 2022.

  • Release "v2022.07" is scheduled in 1 days — on 04 July 2022.

Future Releases:

  • U-Boot v2022.07-rc1 was released on Mon 25 April 2022.
  • U-Boot v2022.07-rc2 was released on Mon 09 May 2022.

Please note that the following dates are for information only and without responsibility:

  • "v2022.07": end of MW = Mon, Apr 25, 2022; release = Mon, Jul 04, 2022
  • "v2022.10": end of MW = Mon, Jul 25, 2022; release = Mon, Oct 03, 2022
  • "v2023.01": end of MW = Mon, Oct 24, 2022; release = Mon, Jan 09, 2023
  • "v2023.04": end of MW = Mon, Jan 30, 2022; release = Mon, Apr 03, 2023

Previous Releases:

Note: these statistics are generated by a clone of Jonathan Corbet's gitdm script; the U-Boot configuration can be found here.

U-Boot v2022.04 was released on Mon, 04 April 2022. (Statistics)

U-Boot v2022.01 was released on Mon, 10 January 2022. (Statistics)

U-Boot v2021.10 was released on Mon, 04 October 2021. (Statistics)

U-Boot v2021.07 was released on Mon, 05 July 2021. (Statistics)

U-Boot v2021.04 was released on Mon, 05 April 2021. (Statistics)

U-Boot v2021.01 was released on Mon, 11 January 2021. (Statistics)

U-Boot v2020.10 was released on Mon, 05 October 2020. (Statistics)

U-Boot v2020.07 was released on Mon, 06 July 2020. (Statistics)

U-Boot v2020.04 was released on Mon, 13 April 2020. (Statistics)

U-Boot v2020.01 was released on Mon, 06 January 2020. (Statistics)

U-Boot v2019.10 was released on Mon, 07 October 2019. (Statistics)

U-Boot v2019.07 was released on Mon, 08 July 2019. (Statistics)

U-Boot v2019.04 was released on Mon, 08 April 2019. (Statistics)

U-Boot v2019.01 was released on Mon, 14 January 2019. (Statistics)

U-Boot v2018.11 was released on Thu, 15 November 2018. (Statistics)

U-Boot v2018.09 was released on Mon, 10 September 2018. (Statistics)

U-Boot v2018.07 was released on Mon, 19 July 2018. (Statistics)

U-Boot v2018.05 was released on Mon, 07 May 2018. (Statistics)

U-Boot v2018.03 was released on Tue, 13 March 2018. (Statistics)

U-Boot v2018.01 was released on Mon, 08 January 2018. (Statistics)

U-Boot v2017.11 was released on Mon, 13 November 2017. (Statistics)

U-Boot v2017.09 was released on Mon, 11 September 2017. (Statistics)

U-Boot v2017.07 was released on Mon, 10 July 2017. (Statistics)

U-Boot v2017.05 was released on Mon, 08 May 2017. (Statistics)

U-Boot v2017.03 was released on Mon, 13 Mar 2017. (Statistics)

U-Boot v2017.01 was released on Mon, 09 Jan 2017. (Statistics)

U-Boot v2016.11 was released on Mon, 14 Nov 2016. (Statistics)

U-Boot v2016.09 was released on Mon, 12 Sep 2016. (Statistics)

U-Boot v2016.07 was released on Mon, 11 Jul 2016. (Statistics)

U-Boot v2016.05 was released on Mon, 16 May 2016. (Statistics)

U-Boot v2016.03 was released on Mon, 14 Mar 2016. (Statistics)

U-Boot v2016.01 was released on Tue, 12 Jan 2016. (Statistics)

U-Boot v2015.10 was released on Mon, 19 Oct 2015. (Statistics)

U-Boot v2015.07 was released on Tue, 14 Jul 2015. (Statistics)

U-Boot v2015.04 was released on Mon, 13 Apr 2015. (Statistics)

U-Boot v2015.01 was released on Mon, 12 Jan 2015. (Statistics)

U-Boot v2014.10 was released on Tue, 14 Oct 2014. (Statistics)

U-Boot v2014.07 was released on Mon, 14 Jul 2014. (Statistics)

U-Boot v2014.04 was released on Mon, 14 Apr 2014. (Statistics)

U-Boot v2014.01 was released on Mon, 20 Jan 2014. (Statistics)

U-Boot v2013.10 was released on Wed, 16 Oct 2013. (Statistics)

U-Boot v2013.07 was released on Mon, 22 Jul 2013. (Statistics)

U-Boot v2013.04 was released on Fri, 19 Apr 2013. (Statistics)

U-Boot v2013.01 was released on Tue, 15 Jan 2013. (Statistics)

U-Boot v2012.10 was released on Mon, 15 Oct 2012. (Statistics)

U-Boot v2012.07 was released on Mon, 30 Jul 2012. (Statistics)

U-Boot v2012.04 was released on Sat, 21 Apr 2012. (Statistics)

U-Boot v2011.12 was released on Fri, 23 Dec 2011. (Statistics)

U-Boot v2011.09 was released on Thu, 29 Sep 2011. (Statistics)

U-Boot v2011.06 was released on Mon, 27 Jun 2011. (Statistics)

U-Boot v2011.03 was released on Thu, 31 Mar 2011. (Statistics)

U-Boot v2010.12 was released on Wed, 22 Dec 2010. (Statistics)

U-Boot v2010.09 was released on Tue, 28 Sep 2010. (Statistics)

U-Boot v2010.06 was released on Tue, 29 Jun 2010. (Statistics)

U-Boot v2010.03 was released on Wed, 31 Mar 2010. (Statistics)

U-Boot v2009.11 was released on Tue, 15 Dec 2009. (Statistics)

U-Boot v2009.08 was released on Mon, 31 Aug 2009. (Statistics)

U-Boot v2009.06 was released on Sun, 14 Jun 2009. (Statistics)

U-Boot v2009.03 was released on Sat, 21 Mar 2009. (Statistics)

U-Boot v2009.01 was released on Wed, 21 Jan 2009. (Statistics)

U-Boot v2008.10 was released on Sat, 18 Oct 2008. (Statistics)

U-Boot v1.3.4 was released on Tue, 12 Aug 2008. (Statistics)

U-Boot v1.3.3 was released on Mon, 19 May 2008. (Statistics)

U-Boot v1.3.2 was released on Sun, 09 Mar 2008. (Statistics)

U-Boot v1.3.1 was released on Thu, 06 Dec 2007. (St Nicholas release) (Statistics)

U-Boot v1.3.0 was released on Mon, 19 Nov 2007. (Statistics)

Statistics for the last 12 months:

From v2017.07 (2017-07-10) through v2018.07 (2018-07-09):
  • Timespan 364 days
  • Processed 6307 csets from 396 developers
  • 42 employers found
  • A total of 481185 lines added, 209346 removed (delta 271839)
That gives:
  • 17.3 commits per day or one commit every 83 minutes
  • per day 1322 lines added, 575 removed (delta 747)
  • one line added every 65 seconds, one removed every 150 seconds

From v2012.10 (2012-10-15) through v2013.10 (2013-10-16):
  • Timespan 366 days
  • Processed 3811 csets from 333 developers
  • 41 employers found
  • A total of 289105 lines added, 251298 removed (delta 37807)
That gives:
  • 10.4 commits per day or one commit every 138 minutes
  • per day 790 lines added, 687 removed (delta 103)
  • one line added every 109 seconds, one removed every 126 seconds


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