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Document the change in polarity of the uart(4) PPS capture.

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ian 2015-08-10 21:09:06 +00:00
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commit 8b8b7091f9
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@ -31,6 +31,20 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 11.x IS SLOW:
disable the most expensive debugging functionality run disable the most expensive debugging functionality run
"ln -s 'abort:false,junk:false' /etc/malloc.conf".) "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: 20150809:
The default group assigned to /dev/dri entries has been changed 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 from 'wheel' to 'video' with the id of '44'. If you want to have