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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: Wed, 12 Sep 2012 10:35:07 +0800	[thread overview]
Message-ID: <504FF4DB.6030601@redhat.com> (raw)
In-Reply-To: <5049B6AD.9000304@redhat.com>

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.

Because it works without explicitly passing the kernel param, I will not
update the patch anymore.

Thanks everyone for your comments.


-- 
Thanks
Dave

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  parent reply	other threads:[~2012-09-12  2:39 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 [this message]
2012-10-18  3:12           ` Dave Young
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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