Subject: kern/7832: nsphy uses incorrect sense of PCR_FLINK100
To: None <firstname.lastname@example.org>
From: None <email@example.com>
Date: 06/22/1999 06:22:43
>Synopsis: nsphy uses incorrect sense of PCR_FLINK100
>Responsible: kern-bug-people (Kernel Bug People)
>Arrival-Date: Tue Jun 22 06:05:00 1999
>Originator: Dave Sainty
Dynamic Technology Services and Products Ltd (NZ)
>Release: sup 19990623
src/sys/dev/mii/nsphy.c explicitly clears the PCR_FLINK100 bit in the
PCR register of the PHY. However, the National semiconductor
datasheet (in pdf form on their website) states that this bit will be
set after a chip reset, and in fact the bit indicates normal operation
when set, and forces good link when it is clear.
Unfortunately, only the DP83840A datasheets are online. It appears
that the DP83840 datasheets were there but have been removed. The
nsphy code mentions both interchangeably. It is "possible" the
interpretation of this bit has changed, in which case the code should
autodetect the DP83840A Vs DP83840 (via silicon revision register
Does anyone have datasheets for the original DP83840 still? I'd very
much like to see them.
Additionally, the Linux eepro100 driver calls the undocumented 0x100
bit "congestion control", enabled when set. It sets 0x400, but
doesn't say what it means (perhaps they were documented for the
To come clean, I don't actually have any DP83840A cards, only DP83840.
But as my cards are tulip based, this code isn't even touched for my
cards. So the only way to repeat that I know is by inspection.
Perhaps someone with a suitably equipped network card could say.
--- nsphy.c.orig Wed May 19 04:08:12 1999
+++ nsphy.c Wed Jun 23 00:19:30 1999
@@ -212,11 +212,10 @@
reg |= PCR_CIMDIS;
- * Make sure "force link good" is not set. It's only
- * intended for debugging, but sometimes it's set
- * after a reset.
+ * Make sure "force link good" is set to normal mode.
+ * It's only intended for debugging.
- reg &= ~PCR_FLINK100;
+ reg |= PCR_FLINK100;
System: NetBSD tequila.dave.dtsp.co.nz 1.4D NetBSD 1.4D (TEQUILA) #17: Mon Jun 21 02:27:29 NZST 1999 firstname.lastname@example.org:/vol/tequila/userC/NetBSD-current/src/sys/arch/i386/compile/TEQUILA i386