Date: Mon, 10 Aug 2015 21:09:06 +0000 (UTC) From: Ian Lepore <ian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r286596 - head Message-ID: <201508102109.t7AL96No038438@repo.freebsd.org>
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Author: ian Date: Mon Aug 10 21:09:06 2015 New Revision: 286596 URL: https://svnweb.freebsd.org/changeset/base/286596 Log: Document the change in polarity of the uart(4) PPS capture. Modified: head/UPDATING Modified: head/UPDATING ============================================================================== --- head/UPDATING Mon Aug 10 20:54:03 2015 (r286595) +++ head/UPDATING Mon Aug 10 21:09:06 2015 (r286596) @@ -31,6 +31,20 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 11 disable the most expensive debugging functionality run "ln -s 'abort:false,junk:false' /etc/malloc.conf".) +20150810: + The polarity of Pulse Per Second (PPS) capture events with the + uart(4) driver has been corrected. Prior to this change the PPS + "assert" event corresponded to the trailing edge of a positive PPS + pulse and the "clear" event was the leading edge of the next pulse. + + As the width of a PPS pulse in a typical GPS receiver is on the + order of 1 millisecond, most users will not notice any significant + difference with this change. + + Anyone who has compensated for the historical polarity reversal by + configuring a negative offset equal to the pulse width will need to + remove that workaround. + 20150809: The default group assigned to /dev/dri entries has been changed from 'wheel' to 'video' with the id of '44'. If you want to have
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