From: Dave Young <dyoung@redhat.com>
To: Khalid Aziz <khalid.aziz@hp.com>
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: Thu, 18 Oct 2012 11:12:20 +0800 [thread overview]
Message-ID: <507F7394.5020501@redhat.com> (raw)
In-Reply-To: <504FF4DB.6030601@redhat.com>
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.
--
Thanks
Dave
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next prev parent reply other threads:[~2012-10-18 3:15 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 [this message]
2012-10-18 14:59 ` Khalid Aziz
2012-10-22 2:05 ` Dave Young
2012-09-06 20:24 ` Vivek Goyal
2012-09-07 14:32 ` Khalid Aziz
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