Re: access efi variables - Arend van Spriel

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From: "Arend van Spriel" <arend-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
To: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: Matt Fleming
	<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: access efi variables
Date: Sat, 14 Sep 2013 19:01:19 +0200	[thread overview]
Message-ID: <5234965F.3050404@broadcom.com> (raw)
In-Reply-To: <5233939B.3020401-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>

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

WARNING: multiple messages have this Message-ID (diff)

From: "Arend van Spriel" <arend@broadcom.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Matt Fleming" <matt.fleming@intel.com>,
	linux-efi@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: access efi variables
Date: Sat, 14 Sep 2013 19:01:19 +0200	[thread overview]
Message-ID: <5234965F.3050404@broadcom.com> (raw)
In-Reply-To: <5233939B.3020401@zytor.com>

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

next prev parent reply	other threads:[~2013-09-14 17:01 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-13 15:37 access efi variables Arend van Spriel
2013-09-13 15:37 ` Arend van Spriel
2013-09-13 16:39 ` Arend van Spriel
     [not found] ` <52333139.6020203-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2013-09-13 22:37   ` H. Peter Anvin
2013-09-13 22:37     ` H. Peter Anvin
     [not found]     ` <5233939B.3020401-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-09-14 17:01       ` Arend van Spriel [this message]
2013-09-14 17:01         ` Arend van Spriel
     [not found]         ` <5234965F.3050404-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2013-09-17 15:46           ` Matt Fleming
2013-09-17 15:46             ` Matt Fleming

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