On Sat, Jun 30, 2007 at 11:53:25PM +0200, Michael Buesch wrote:
> > When the interface is down (or driver removed), the BroadCom 44xx card remains
> > powered on, and both its MAC and PHY is using up power.
> > This patch makes the driver issue a MAC_CTRL_PHY_PDOWN when the interface
> > is halted, and does a partial chip reset turns off the activity LEDs too.
> >
> > Applies to 2.6.22-rc6, or current git head.
> >
> > Tested on a Broadcom BCM4401-B0 card, it saves ~0.5W (measured using powertop).
>
> Hm, I was going to measure the real power advantage with a
> PCI-extender card. But my B44B0 card doesn't seem to work in
> that extender card. It works perfectly fine sticked directly into
> the motherboard, though, and other cards like a BCM4318 work in
> the extender, too.
> Not sure what this is.
> The extender has an application note about nonworking cards in the
> extender and a too big resistor on the board IDSEL pin being the
> cause of this.
Does the card show up in lspci at all? IDSEL drive strength
issues should only affect config space accesses.
Does the extender board have a PCI-PCI bridge on it? (If not,
there's not really any reason to resistively couple the IDSEL
line to the host, since the host should take care of that.)
> Maybe I can try with another machine tomorrow.
That would only make a difference if there is no PCI-PCI bridge on
the extender board.
If the extender resistively couples the host's IDSEL line, you might
see different results on a different host bridge, since different
host bridges can use different numbers of IDSEL stepping cycles.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
