From: ebiederm@xmission.com (Eric W. Biederman)
To: Bernhard Walle <bwalle@suse.de>
Cc: kexec@lists.infradead.org, Jamey Sharp <jamey@thetovacompany.com>
Subject: Re: kexec --real-mode
Date: Tue, 29 Apr 2008 10:15:13 -0700 [thread overview]
Message-ID: <m1fxt44m72.fsf@frodo.ebiederm.org> (raw)
In-Reply-To: <20080429175826.4a891110@strauss.suse.de> (Bernhard Walle's message of "Tue, 29 Apr 2008 17:58:26 +0200")
Bernhard Walle <bwalle@suse.de> writes:
> * Eric W. Biederman [2008-04-28 10:55]:
>>
>> It is a different code path. It is designed to exercise the 16bit BIOS
>> calls that the kernel uses with a lot of serial port debugging
>> so we can see if that is the problem.
>
> Well, that gives me
> ------------------------------------------------------------
> I'm in purgatory
> kexec_test 20080324 starting...
> eax: 00000000 ebx: 00000000 ecx: 00000000 edx: 00000000
> esi: 00000000 edi: 00000000 esp: 00008FF8 ebp: 00000000
> idt: 00000000 00000000
> gdt: 0000006F 00005BA0
> Switching descriptors.
> Descriptors changed.
> Legacy pic setup.
> In real mode.
> Interrupts enabled.
> Base memory size: 0276
> A20 disabled.
> E820 Memory Map.
> 000000000009D800 @ 0000000000000000 type: 00000001
> 0000000000002800 @ 000
> ------------------------------------------------------------
>
> Yes, the output stops here. Don't know why ...
Ok. I'm guessing that whatever it is immediately after
the e820 map dump causes the box to go south.
But this is a very good clue that your BIOS just can't
handle being run after the linux kernel has run at
this point. Unfortunately this is common and why
the --real-mode switch has not been the default for several years.
What is your interest in getting the --real-mode option working at this
point?
After this point the debugging starts to get very laborious.
Eric
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next prev parent reply other threads:[~2008-04-29 17:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-22 13:16 kexec --real-mode Bernhard Walle
2008-04-22 23:44 ` Jamey Sharp
2008-04-23 8:34 ` Bernhard Walle
2008-04-23 14:00 ` Eric W. Biederman
2008-04-28 8:22 ` Bernhard Walle
2008-04-28 17:55 ` Eric W. Biederman
2008-04-29 15:58 ` Bernhard Walle
2008-04-29 17:15 ` Eric W. Biederman [this message]
2008-04-30 8:38 ` Bernhard Walle
2008-04-30 19:35 ` Eric W. Biederman
2008-04-30 21:08 ` Jamey Sharp
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