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Date:	Thu, 7 Aug 2014 09:07:51 +0200
From:	Ard Biesheuvel <>
To:	Dave Young <>
Cc:	Catalin Marinas <>,
	Will Deacon <>,
	Matt Fleming <>,
	Leif Lindholm <>,
	Mark Salter <>,
	"" <>
Subject: Re: [PATCH 1/2] UEFI arm64: add noefi boot param

> On 7 aug. 2014, at 03:28, Dave Young <> wrote:
>> On 08/06/14 at 02:40pm, Ard Biesheuvel wrote:
>>> On 6 August 2014 10:38, Dave Young <> wrote:
>>> Adding a noefi boot param like in X86 to disable efi runtime services support.
>>> This will be useful for debugging uefi problems. Also it will be useful
>>> for later kexec/kdump work. Kexec on uefi support in X86 depends on a fixed vm
>>> area specific for uefi runtime 1:1 mapping, kernel will switch to a different
>>> page table for any uefi runtime callback in virtual mode. In arm64 similar
>>> work probably is necessary. But kexec boot will just works with 'noefi' with
>>> the limitaion of lacking runtime services. The runtime services is not critical
>>> for kdump kernel for now. So as for kexec/kdump just leave the 1:1 mapping a
>>> future work.
>> Can we find a better name? You will still be using the UEFI memory map
>> rather than the DT memory nodes (which will have been deleted by the
>> stub), and things like SMBIOS and ACPI that hinge off UEFI remain
>> enabled as well.
> Hi, Ard
> Leif suggested efi=noruntime, I think that will be better to you?

Yes, that sounds perfect to me


> Thanks for review.
> Dave
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