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From: "H. Peter Anvin" <hpa@zytor.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>,
	Chris Bainbridge <chris.bainbridge@gmail.com>
Cc: davej@redhat.com, x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86: set Pentium M as PAE capable
Date: Wed, 26 Feb 2014 08:45:41 -0800	[thread overview]
Message-ID: <530E1A35.40506@zytor.com> (raw)
In-Reply-To: <20140226164433.GA19341@srcf.ucam.org>

On 02/26/2014 08:44 AM, Matthew Garrett wrote:
> On Wed, Feb 26, 2014 at 07:12:59PM +0700, Chris Bainbridge wrote:
> 
>> The basic findings of the bug discussion is that people are successfully
>> running PAE kernels on Pentium M (for some unknown reason Grub skips the
>> validate_cpu code in the kernel, so existing PAE kernels will run
>> unmodified, although they do fail when booted with syslinux), and people
>> are using a user-space hack to add "pae" to /proc/cpuinfo.
> 
> grub is jumping to the 32-bit entry point and skipping the entire real 
> mode setup code. Bad grub.
> 

Yes.  Grub can be made to behave sanely by using "linux16" and
"initrd16", but of course none of the distros do it that way.

There are much worse problems with that.

	-hpa


  reply	other threads:[~2014-02-26 16:46 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-25  6:01 [PATCH] x86: set Pentium M as PAE capable Chris Bainbridge
2014-02-25 10:45 ` H. Peter Anvin
2014-02-25 11:35   ` Borislav Petkov
2014-02-25 12:06   ` Peter Hurley
2014-02-25 12:07   ` One Thousand Gnomes
2014-02-25 16:26   ` Dave Jones
2014-02-25 17:16     ` H. Peter Anvin
2014-02-26 12:12       ` Chris Bainbridge
2014-02-26 13:18         ` Borislav Petkov
2014-02-26 15:49           ` Dave Jones
2014-02-26 17:18             ` Borislav Petkov
2014-02-26 17:20               ` Dave Jones
2014-02-26 17:28                 ` Borislav Petkov
2014-02-28  7:30             ` Chris Bainbridge
     [not found]               ` <CAKKYfmFgVjYwvThpB0FBB+ggOwULWKLpz7ADT1eojno_KtD9yw@mail.gmail.com>
2014-02-28 14:00                 ` Chris Bainbridge
2014-03-02 20:56                   ` Andreas Mohr
2014-03-02 20:59                     ` H. Peter Anvin
2014-03-02 21:02                     ` Dave Jones
2014-03-02 21:04                       ` Borislav Petkov
2014-03-02 21:13                         ` Andreas Mohr
2014-03-02 21:42                       ` Gene Heskett
2014-03-03 12:31                         ` One Thousand Gnomes
2014-03-03  8:04                     ` Chris Bainbridge
2014-03-03 19:29                       ` Borislav Petkov
2014-03-04  5:01                         ` Chris Bainbridge
2014-03-04  5:04                           ` H. Peter Anvin
2014-03-04  6:06                             ` Chris Bainbridge
2014-03-04 10:44                               ` Borislav Petkov
2014-03-05  4:17                                 ` Chris Bainbridge
2014-03-07 11:40                                 ` [PATCH] x86: Add forcepae parameter for booting PAE kernels on PAE-disabled Pentium M Chris Bainbridge
2014-03-10 10:25                                   ` Borislav Petkov
2014-03-20 23:30                                   ` [tip:x86/cpu] x86, cpu: " tip-bot for Chris Bainbridge
2014-03-20 23:33                                   ` tip-bot for Chris Bainbridge
2014-03-20 23:30             ` [tip:x86/cpu] Rename TAINT_UNSAFE_SMP to TAINT_CPU_OUT_OF_SPEC tip-bot for Dave Jones
2014-02-26 16:46           ` [PATCH] x86: set Pentium M as PAE capable H. Peter Anvin
2014-02-26 16:44         ` Matthew Garrett
2014-02-26 16:45           ` H. Peter Anvin [this message]
2014-02-26 17:10             ` Matthew Garrett
2014-02-26 17:57               ` H. Peter Anvin
2014-03-03  0:11                 ` H. Peter Anvin
2014-03-02 19:05 Roland Kletzing

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