cvs commit: src/sys/dev/mii brgphy.c

John Polstra jdp at
Tue Mar 20 19:45:11 UTC 2007

Jung-uk Kim wrote:
> jkim        2007-03-19 23:17:39 UTC
>   FreeBSD src repository
>   Modified files:
>     sys/dev/mii          brgphy.c 
>   Log:
>   Revert couple of changes from 1.51 and 1.52.  Reading link status with BMSR
>   is okay for most of the chipsets but BCM5701 PHY does not seem to like it.

I'm not sure what you mean by "does not seem to like it", but did you 
try reading the BMSR twice?  The link status bit is a latching bit.  If 
you read the register once and it shows no link status, that only means 
that at some point since you previously read the register, link was 
lost.  It says nothing about the current status of link.  The only way 
to find out the current status of link is to read the register twice. 
The first read clears the latch, and the second read reports the current 
status.  This is not specific to the Broadcom chips.  It is standard 
across all PHYs.


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