From: "H. Peter Anvin" <hpa@zytor.com>
To: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Andi Kleen <ak@suse.de>, Greg KH <greg@kroah.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jeff Garzik <jeff@garzik.org>, Martin Mares <mj@ucw.cz>,
dean gaudet <dean@arctic.org>,
Robert Richter <robert.richter@amd.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is used
Date: Thu, 13 Sep 2007 10:20:56 -0700 [thread overview]
Message-ID: <46E97178.2040903@zytor.com> (raw)
In-Reply-To: <86802c440709131001w4b758921r52a23f1732a6e9c8@mail.gmail.com>
Yinghai Lu wrote:
>
> BIOS guys also said that fam 10h need mmconfig via eax accessing, may
> need OS do sth, so it is safe to stay with MCFG entry for SB like
> mcp55...
>
> but latest kernel already have that workaround to make mmconfig via eax...
>
This is actually a good point. Since the CPU vendor managed to
completely fuck up the operation of MMCONFIG itself on this CPU (it's a
*MEMORY REFERENCE*, guys!), it is actually to be expected and prudent
that BIOS vendors will drop the MCFG entry. MMCONFIG doesn't actually
work on this CPU for any system software which doesn't already know to
work around this particular piece of severe braindamage;
standards-complicant MMCONFIG isn't supported at all.
-hpa
next prev parent reply other threads:[~2007-09-13 17:22 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-13 2:21 [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is used Yinghai Lu
2007-09-13 2:17 ` Andrew Morton
2007-09-13 9:47 ` Andi Kleen
2007-09-13 10:47 ` Greg KH
2007-09-13 11:53 ` Andi Kleen
2007-09-13 17:01 ` Yinghai Lu
2007-09-13 17:20 ` H. Peter Anvin [this message]
2007-09-13 19:22 ` Yinghai Lu
2007-09-13 19:31 ` H. Peter Anvin
2007-09-13 20:15 ` Andreas Herrmann
2007-09-13 20:54 ` H. Peter Anvin
2007-09-14 11:21 ` [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG Andreas Herrmann
2007-09-14 14:08 ` H. Peter Anvin
2007-09-14 17:28 ` Yinghai Lu
2007-09-14 18:09 ` Yinghai Lu
2007-09-16 3:18 ` [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is used Andi Kleen
2007-09-13 19:52 ` Andreas Herrmann
2007-09-13 20:14 ` Yinghai Lu
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