linux-kernel - Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

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Message-ID: <476751EF.3090601@zytor.com>
Date:	Mon, 17 Dec 2007 20:51:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Andi Kleen <ak@....de>, Paul Mackerras <paulus@...ba.org>,
	Greg KH <gregkh@...e.de>, David Miller <davem@...emloft.net>,
	venkatesh.pallipadi@...el.com, rdreier@...co.com,
	torvalds@...ux-foundation.org, airlied@...net.ie, davej@...hat.com,
	mingo@...e.hu, tglx@...utronix.de, akpm@...ux-foundation.org,
	arjan@...radead.org, jesse.barnes@...el.com,
	linux-kernel@...r.kernel.org, suresh.b.siddha@...el.com
Subject: Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

Eric W. Biederman wrote:
> 
> 0000_00FD_FC00_0000h - 0000_00FD_FDFF_FFFFh On a hypertransport based
> system should work.  There is a 32MB window for it.
> 

It doesn't.  The termination on MMIO and IOIO transaction is different, 
and poking this memory window with an MMIO transaction will lock the 
chipset hard (yes, I've tried it.)

	-hpa
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