Re: [patch 4/5] pci-quirks: unhide 'Overflow' device on i828{6,7}5P/PE chipsets

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On Friday, January 9, 2009 12:26 pm akpm@xxxxxxxxxxxxxxxxxxxx wrote:
> From: Michal Miroslaw <mirq-linux@xxxxxxxxxxxx>
>
> As I found out from EDAC driver sources for i82875P some BIOSes for
> i82875P/PE hide 'overflow' device 6.  The same thing happens for
> i82865P/PE chipsets.
>
> After testing this patch for couple of days on my laptop (i82856P) it
> looks like something is resetting device 0 (MCH) config register 0xF4 to
> zero and effectively disabling the device again.  The delay looks random
> to me.  I can easily update the register using 'hexedit
> /sys/bus/pci/devices/0000\:00\:00.0/config' and see correct values in
> lspci output afterwards.

This one already got a NAK until Michal can figure out a way to prevent the 
SMM code on his machine from hiding this device periodically.

-- 
Jesse Barnes, Intel Open Source Technology Center
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