On Thu, 14 Dec 2006, I wrote:
On Wed, 13 Dec 2006, Jung-uk Kim wrote:
On Wednesday 13 December 2006 03:51 pm, Scott Long wrote:
scottl 2006-12-13 20:51:51 UTC
FreeBSD src repository
Modified files:
sys/dev/bge if_bge.c
Log:
Remove a redundant write of the firmware reset magic number. It
...
I am still getting firmware handshake timeouts and/or watchdog
timeouts. Most importantly it panics or get witness warnings (lots
of 'memory modified after free'). Panic goes like this (while
kldunload if_bge with dhclient enabled):
brgphy0: detached
miibus0: detached
bge0: firmware handshake timed out, found 0x4b657654
bge0: firmware handshake timed out, found 0x4b657654
I have seen these for debugging the redundant-write problem (not for
detach but for bringing up the interface for the first time). My 5701
just hangs if there is any redundant write (2 where the first one was
in bge_reset(), or 2 separate, or 2 where the second one was). My
5705 survives two separate sets of 256 repeated writes; however, then
the firmware handshake times out; however2, everything works normally
after ignoring the the timeout except for printing the message. I
just noticed that this error wasn't ignored until recently -- I noticed
the return statement being removed but not that it was in a critical
area.
The debugging code doesn't seem to have been responsible for this.
Now, without it I almost (?) always get handshake errors on the 5705,
but never (?) on the 5701. Apparently, the 3rd write (the one that
was removed) was the only correctly placed one.
I just noticed that the code is much clearer and less surprising in old
versions. In rev.1.84, there is only 1 write and it is immediately
followed by the handshake loop. Now there is a lot of code in between.
This is relevant too. Rev.1.141 moved the only write of the magic
value from just before the handshake to much earlier, where it became
the third write just before it was removed, to ``Resolve "firmware
handshake" error on 5702''.
Bruce
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