From: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
To: Lars <terraformers@gmx.net>
Subject: Re: 2.6.7-rc3: nforce2, no C1 disconnect fixup applied
Date: Thu, 10 Jun 2004 23:56:07 +0200
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On Thursday 10 of June 2004 23:36, Lars wrote:
> thanks
>
> after some reading, im using now in rc.local:
>
> ### C1 Halt Disconnect Fix for Chip rev. C17
> setpci -H1 -s 0:0.0 6F=1F
> setpci -H1 -s 0:0.0 6E=01
> echo "Applying C1 Halt Disconnect Fix"
>
> this is for an older nforce2 board (a7n8x 1.04) with rev. C17 chip
> and worked fine so far.
>
> for the newer chip revision it should read
>
> ### C1 Halt Disconnect Fix for Chip rev. C18D
> setpci -H1 -s 0:0.0 6F=9F
> setpci -H1 -s 0:0.0 6E=01
> echo "Applying C1 Halt Disconnect Fix"
>
> first setpci is for the c1 halt bit and the second one enables the
> 80ns stability value.

Order should be reversed.

> i understand that its not good to enable c1 for all boards, but it would
> be nice to have the option to force the fixup on boards which
> work ok but have no bios option to enable c1. (like the a7n8x)
> an bootoption like "forceC1halt" or something would be nice here.

It can be perfectly handled in user-space as you've just showed. :-)
There is no need to add complexity to the kernel.

> cheers,
> lars
>
> >> ...maybe a switch to force the fixup on boards without c1 disconnect
> >> bios-settings would do it ?
> >
> > We can't do that, some older boards hang if C1 disconnect is used.
> >
> > However you can enable fixup and then C1 Halt Disconnect yourself. :-)
> >
> > setpci -v -H1 -s 0:0.0 6C.L=$(printf %x $((0x$(setpci -H1 -s 0:0.0 6C.L)
> > & 0x9F01FF01)))
> >
> > - to enable fixup first
> >
> > setpci -v -H1 -s 0:0.0 6F=$(printf %x $((0x$(setpci -H1 -s 0:0.0 6F) |
> > 0x10)))
> >
> > - to enable C1 Halt Disconnect
> >
> > [ this is untested as I don't have nForce2 board ]
>
> -
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