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From: Dave Young <dyoung@redhat.com>
To: Khalid Aziz <khalid@gonehiking.org>
Cc: horms@verge.net.au, kexec@lists.infradead.org, vgoyal@redhat.com
Subject: Re: [PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel
Date: Mon, 22 Oct 2012 10:05:46 +0800	[thread overview]
Message-ID: <5084A9FA.1090403@redhat.com> (raw)
In-Reply-To: <1350572394.3894.18.camel@rhapsody>

On 10/18/2012 10:59 PM, Khalid Aziz wrote:

> On Thu, 2012-10-18 at 11:12 +0800, Dave Young wrote:
>> On 09/12/2012 10:35 AM, Dave Young wrote:
>>
>>> On 09/07/2012 04:56 PM, Dave Young wrote:
>>>>
>>>> I did some digging about the efi boot kdump in slackware with kernel
>>>> from latest linus tree. I'm surprise that kdump works even without these
>>>> "noefi" and "acpi_rsdp="
>>>>
>>>> With fedora 17 3.4.3 kernel passing "acpi_rsdp=" is enough for kdump
>>>> kernel booting.
>>>>
>>>> Actually in x86 setup code if bootloader do not pass correct efi_info in
>>>> boot_params efi_enabled will be set to 0 automaticlly.
>>>>
>>>> So as for this patch 'noefi' is not needed.
>>>>
>>>> I will do more testing to see why linus tree works without "acpi_rsdp="
>>>>
>>>
>>> There's probably some efi changes between 3.4.3 - 3.6.0-rc4 cause this
>>> works. I have not got time to bisect it.
>>
>>
>> During recent test, I found I mistakenly used wrong kernel config
>> without CONFIG_EFI in 1st kernel for testing. acpi_rsdp= is still needed.
>>
>> Just resent the v2 patch, please help to review.
>>
> 
> Hi Dave,
> 
> I suspect EFI based systems with Compatibility Support Module (CSM) are
> still not going to need this, but I can see native EFI systems with no
> CSM needing this. I have reviewed your patch.


Good to know, I have no CSM machine to test. Since Simon has applied the
patch, I think I can improve this issue later If I can find a machine
with CSM.

> 
> BTW, I am no longer at HP, so <khalid.aziz@hp.com> is no longer valid.
> <khalid@gonehiking.org> is my permanent personal email address.


Thanks for reminding.

> 
> --
> Khalid
> 
> 
> _______________________________________________
> kexec mailing list
> kexec@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec



-- 
Thanks
Dave

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  reply	other threads:[~2012-10-22  2:09 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-05  5:44 [PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel Dave Young
2012-09-05  7:45 ` Simon Horman
2012-09-06  2:48   ` Dave Young
2012-09-05 13:18 ` Vivek Goyal
2012-09-06  2:58   ` Dave Young
2012-09-06 20:46     ` Vivek Goyal
2012-09-05 23:09 ` Khalid Aziz
2012-09-06  3:18   ` Dave Young
2012-09-06 17:57     ` Khalid Aziz
2012-09-07  8:56       ` Dave Young
2012-09-07 14:37         ` Khalid Aziz
2012-09-13 13:38           ` Vivek Goyal
2012-09-14 20:32             ` Khalid Aziz
2012-09-20  7:49               ` Eric W. Biederman
2012-09-21 22:50                 ` Khalid Aziz
2012-09-12  2:35         ` Dave Young
2012-10-18  3:12           ` Dave Young
2012-10-18 14:59             ` Khalid Aziz
2012-10-22  2:05               ` Dave Young [this message]
2012-09-06 20:24   ` Vivek Goyal
2012-09-07 14:32     ` Khalid Aziz

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