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Date: Thu, 7 Aug 2014 09:28:47 +0800
From: Dave Young <dyoung@redhat.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Matt Fleming <matt.fleming@intel.com>,
        Leif Lindholm <leif.lindholm@linaro.org>,
        Mark Salter <msalter@redhat.com>,
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	<linux-arm-kernel@lists.infradead.org>,
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Subject: Re: [PATCH 1/2] UEFI arm64: add noefi boot param
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On 08/06/14 at 02:40pm, Ard Biesheuvel wrote:
> On 6 August 2014 10:38, Dave Young <dyoung@redhat.com> 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?

Thanks for review.
Dave