Accessing NVRAM on the Maple board

[brian jewell]

Benjamin,

I think I need to reword my question...

The company I work for is building a small footprint PPC970 board, based on 
the Maple reference design, that uses a proprietary service processor. I 
need to be able to read NVRAM from Linux on our PPC970 board.

There is a driver in <linux>/arch/ppc64/kernel called "nvram.c" that looks 
like it would provide the capability of reading NVRAM. I was wondering if 
anyone knew anything about this driver, such as if there is any 
documentation on how to use it?

Thanks for your reply.

--Brian

----- Original Message ----- 
From: "Benjamin Herrenschmidt" <benh at kernel.crashing.org>
To: "Dave Willoughby" <drdavew at austin.rr.com>
Cc: "brian jewell" <brian.jewell at themis.com>; <linuxppc64-dev at ozlabs.org>
Sent: Thursday, December 22, 2005 5:17 PM
Subject: Re: Accessing NVRAM on the Maple board


> On Wed, 2005-12-21 at 18:28 -0600, Dave Willoughby wrote:
>> I'm not sure the Maple board has what I think of as NVRAM, the way
>> Apple or pSeries
>> PowerPC computers have NVRAM.
>>
>> The Maple firmware has a PIBS firmware prompt that allows setting
>> boot configuration values
>> if that's what you are looking for.
>
> It also does have an nvram but it's mostly used for communication
> between the service processor and the host OS ...
>
> Ben.
>
>