README: Fix description of version numbering scheme

The version numbering scheme was changed in Oct, 2008.
This patch brings the documentation to the actual level.
The description is taken from:
http://www.denx.de/wiki/U-Boot/ReleaseCycle

Signed-off-by: Thomas Weber <weber@corscience.de>

Changed text slightly.
Signed-off-by: Wolfgang Denk <wd@denx.de>
master
Thomas Weber 13 years ago committed by Wolfgang Denk
parent 86af10cac4
commit 360d883aa0

@ -126,13 +126,17 @@ the string "u_boot" or on "U_BOOT". Example:
Versioning:
===========
U-Boot uses a 3 level version number containing a version, a
sub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
sub-version "34", and patchlevel "4".
The patchlevel is used to indicate certain stages of development
between released versions, i. e. officially released versions of
U-Boot will always have a patchlevel of "0".
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 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 candiate 1 for September 2010 release
Directory Hierarchy:

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