linux-kernel - Re: [Patch] PCI: check szhi when sz is 0 for 64 bit pref mem

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Date:	Wed, 8 Nov 2006 11:10:41 -0800
From:	Andrew Morton <akpm@...l.org>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	"Yinghai Lu" <yinghai.lu@....com>, "Greg KH" <gregkh@...e.de>,
	"Andi Kleen" <ak@...e.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Patch] PCI: check szhi when sz is 0 for 64 bit pref mem

On Wed, 08 Nov 2006 11:19:40 -0700
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> Andrew Morton <akpm@...l.org> writes:
> 
> > On Fri, 3 Nov 2006 21:27:35 -0800
> > "Yinghai Lu" <yinghai.lu@....com> wrote:
> >
> >> For co-prcessor with mem installed, the ram will be treated to pref mem.
> >
> > What is "pref mem"?
> 
> Memory mapped base address registers can be either normal or for prefetchable
> sections of memory mapped I/O.  Frequently all prefetchable bars are 64bit.
> The prefetchable bars are also frequently ask for the largest amounts of
> memory.  So it is easy and worthwhile to place all prefetchable bars about 4G.
> 
> The "pref mem" short hand comes from a the LinuxBIOS print statements that
> report every bar value and what kind of bar it is, during boot up.
> 

Ah.  Prefetchable.  Thanks.

I've basically given up in exhaustion on that patch.  Maybe when I have a
burst of extra energy I'll go back and take the time to understand it,
or maybe when Greg comes back he'll save me.

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