svn commit: r286596 - head
Ian Lepore
ian at FreeBSD.org
Mon Aug 10 21:09:07 UTC 2015
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
More information about the svn-src-all
mailing list