From: Khalid Aziz <khalid@gonehiking.org>
To: Dave Young <dyoung@redhat.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 08:59:54 -0600 [thread overview]
Message-ID: <1350572394.3894.18.camel@rhapsody> (raw)
In-Reply-To: <507F7394.5020501@redhat.com>
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.
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 is no longer valid.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.
--
Khalid
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next prev parent reply other threads:[~2012-10-18 14:59 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 [this message]
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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