netdev - Re: 2.6.23-rc1 sky2 boot crash in sky2_mac

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Date:	Tue, 24 Jul 2007 11:40:42 +0200
From:	Florian Lohoff <flo@...822.org>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.23-rc1 sky2 boot crash in sky2_mac_intr

On Tue, Jul 24, 2007 at 09:50:08AM +0100, Stephen Hemminger wrote:
> The problem is related to power management. The PHY has a number of PCI configuration
> registers for power control, and the function of these changes based on the version and
> revision of the chip. The driver does work on older versions of the EC-U, in
> Fujitsu laptop's, it is just the new rev that is broken.
> 
> The driver should probably fail smarter (by not loading) if the PHY isn't powered
> up correctly, but that doesn't help your problem.
> 
> The vendor has provided me with documentation on many versions
> of the chip, but I don't have doc's on the lastest revision differences of the EC Ultra, 
> so a proper solution is not easily available.  The best method for resolving this would
> be to first try the vendor driver version of sk98lin and see if that fixes it. If so,
> then it is easy to change sky2, to match the phy setup in the vendor driver.
> Another possibility is to look for places in sky2 driver where there are places
> that compare version/revision.
> 
> The most likely bits that need to change are in PCI registers: 0x80, 0x84 and 0x88
> You could also load the windows driver and dump PCI config space (with lspci from
> cygwin), and see what the settings are there.
> 
> I am away from my office for a month, and therefore away from any sky2
> hardware for testing. 

I'll try the above and keep you posted. The crash itself seems to be a
2.6.23-rc1 regression though. I never experienced this with 2.6.22-rc5
which i was running before.

Flo
-- 
Florian Lohoff                  flo@...822.org             +49-171-2280134
	Those who would give up a little freedom to get a little 
          security shall soon have neither - Benjamin Franklin

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