linux-kernel - Re: access efi variables

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Message-ID: <5234965F.3050404@broadcom.com>
Date:	Sat, 14 Sep 2013 19:01:19 +0200
From:	"Arend van Spriel" <arend@...adcom.com>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	"Matt Fleming" <matt.fleming@...el.com>, linux-efi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: access efi variables

On 09/14/13 00:37, H. Peter Anvin wrote:
> On 09/13/2013 08:37 AM, Arend van Spriel wrote:
>> I need to obtain a uefi variable so I went looking at the API in
>> include/linux/efi.h. I found the following definition:
>>
>> But according to the specs the variable I need to obtain is 2k bytes.
>> Should I expect trouble :-p
>>
>
> efivarfs doesn't have those limitations.

Thanks, Peter

Looking into efivarfs it seems to use the functions that I looked at in 
efi.h so I guess I am misinterpreting the 1024 bytes limitation in the 
comment (either that or you are mistaken ;-) ). I need to access the 
variable from within a device driver so using efivarfs does not feel 
like the way to go here.

Regards,
Arend

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