linux-kernel - Re: [PATCH 03/22] efi: add helper function to get UEFI params from FDT

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Date:	Thu, 13 Feb 2014 09:56:15 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Leif Lindholm <leif.lindholm@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-efi@...r.kernel.org, patches@...aro.org
Subject: Re: [PATCH 03/22] efi: add helper function to get UEFI params from
 FDT

On Thu, 2014-02-13 at 11:17 +0000, Matt Fleming wrote:
> On Wed, 05 Feb, at 05:03:54PM, Leif Lindholm wrote:
> > From: Mark Salter <msalter@...hat.com>
> > 
> > ARM and ARM64 architectures use the device tree to pass UEFI parameters
> > from stub to kernel. These parameters are things known to the stub but
> > not discoverable by the kernel after the stub calls ExitBootSerives().
> > There is a helper function in:
> > 
> >    drivers/firmware/efi/fdt.c
> > 
> > which the stub uses to add the UEFI parameters to the device tree.
> > This patch adds a complimentary helper function which UEFI runtime
> > support may use to retrieve the parameters from the device tree.
> > If an architecture wants to use this helper, it should select
> > CONFIG_UEFI_PARAMS_FROM_FDT.
> > 
> > Signed-off-by: Mark Salter <msalter@...hat.com>
> > Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
> > ---
> >  drivers/firmware/efi/Kconfig |    7 ++++
> >  drivers/firmware/efi/efi.c   |   79 ++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/efi.h          |    9 +++++
> >  3 files changed, 95 insertions(+)
> 
> Is there a particular reason this change is being added to
> drivers/firmware/efi/efi.c and not drivers/firmware/efi/fdt.c?
> 

drivers/firmware/efi/fdt.c is included by the stub which may or may not
be linked into kernel image. This helper is used by runtime services and
needs to be built into kernel.

--Mark


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