Jung-uk Kim wrote:
On Tuesday 20 March 2007 03:28 pm, John Polstra wrote:
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.
Believe me, I know that. ;-) I was experimenting on brgphy.c some
time ago and discovered all of my Broadcom PHYs are not 'standard'
PHYs (in your definition), i.e., BMSR's link status bit is not
latching.
The Broadcom docs I have seen document the bit as latching. Of course,
the docs aren't necessarily correct. :-)
John
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