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Mention that Cold Presence Detection feature used for hot-plug detection

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when interface power management is enabled.
This commit is contained in:
Alexander Motin 2011-12-06 09:12:11 +00:00
parent e6ee4f7d33
commit 2266ba7b12
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=228305
1 changed files with 4 additions and 4 deletions
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8
share/man/man4/ahci.4
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd December 2, 2011
.Dd December 6, 2011
.Dt AHCI 4
.Os
.Sh NAME
@ -90,9 +90,9 @@ Some controllers, such as ICH8, do not implement modes 2 and 3 with NCQ used.
Because of artificial entering latency, performance degradation in modes
4 and 5 is much smaller then in modes 2 and 3.
.Pp
Note that interface Power Management is not compatible with
device presence detection.
A manual bus reset is needed on device hot-plug.
Note that interface Power Management complicates device presence detection.
A manual bus reset/rescan may be needed after device hot-plug, unless hardware
implements Cold Presence Detection.
.It Va hint.ahcich. Ns Ar X Ns Va .sata_rev
setting to nonzero value limits maximum SATA revision (speed).
Values 1, 2 and 3 are respectively 1.5, 3 and 6Gbps.