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Document two known hardware errata which requires manual link

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configuration.

Submitted by:	Aries Lee (arieslee <> jmicron com)
This commit is contained in:
Pyun YongHyeon 2011-06-29 17:32:52 +00:00
parent 6bbee8e28a
commit e5064ffc00
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=223683
1 changed files with 15 additions and 1 deletions
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share/man/man4/jme.4
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd December 20, 2010
.Dd June 29, 2011
.Dt JME 4
.Os
.Sh NAME
@ -178,3 +178,17 @@ address once station address is reprogrammed via eFuse.
It is highly recommended not to reprogram station address and
it is responsibility of administrator to store original station
address into a safe place when station address should be changed.
.Pp
There are two known 1000baseT link establishment issues with JMC25x.
If the full mask revision number of JMC25x controller is less than
or equal to 4 and link partner enabled IEEE 802.3az Energy Efficient
Ethernet feature, the controller would not be able to establish a
1000baseT link.
Also if the length of cable is longer than 120 meters, controller
can not establish a 1000baseT link.
The known workaround for the issue is to force manual link
configuration with 100baseTX instead of relying on auto-negotiation.
The full mask revision number of controller could be checked with
verbose kernel boot option.
Use lower nibble of chip revision number to get full mask revision of
the controller.