From: Mike Moleschi <moleschi@rmsweldingsystems•com>
To: "Wright, David" <dwright@infiniswitch•com>,
linuxppc-embedded <linuxppc-embedded@lists•linuxppc.org>
Subject: Re: Accessing nvram rom the linux users space
Date: Tue, 12 Nov 2002 12:52:25 -0700 [thread overview]
Message-ID: <3DD15BF9.6050500@rmsweldingsystems.com> (raw)
In-Reply-To: 3D296C067098F149B11A8F4FC37C05462F21DD@EXVS1.ops.infiniswitch.com
I guess it has to be a disk in that I would like to have a file
system on it and move files around on it -- basically I want to
be able to treat it like a disk from a command line perspective.
I can access the nvram through a C program using open() and mmap(),
but I would like to be level higher then that.
Mike
Wright, David wrote:
> Does it have to be a disk? The Walnut has a similar setup to
> what you are describing and allows you to define a device,
> /dev/nvram, that functions as a disk-like object (you can
> open it, seek it, read and write it).
>
> -- David Wright, InfiniSwitch Corp.
>
>
>
>>-----Original Message-----
>>From: Mike Moleschi [mailto:moleschi@rmsweldingsystems•com]
>>Sent: Tuesday, November 12, 2002 1:29 PM
>>To: linuxppc-embedded@lists•linuxppc.org
>>Subject: Accessing nvram rom the linux users space
>>
>>
>>
>>I am using a PPC board running a version of Hard Hat linux, and
>>currently using version of the 2.4.20 kernel. On the board there
>>are several places for storage: 32MB of SRAM, 4MB of flash-EPROM,
>>32kB of NVRAM, and 16k-bit serial EEPROM. The SRAM, flash and NVRAM
>>are memory mapped. The NVRAM is actually battery backed up RAM
>>that includes a RTC in the last 8 bytes of addressed memory. Right
>>now there is nothing stored in the NVRAM (PPC Boot is stored in
>>part of the flash, and the PPC environment variable are in the
>>serial EEPROM.) NVRAM is mapped from 0xF0200000 to 0xF0207FFF.
>>
>>I would like to be able to uses the NVRAM from the linux users
>>space. Ideally it would just be an extention of my filesystem,
>>where I could place one or two small files on it. This would
>>let me store information that needs to be kept through a loss of
>>power.
>>
>>So basically I think what I am trying to figure out, is how do I
>>mount the NVRAM as a disk.
>>
>>
>>
>>
>>--
>>
>>
>>Mike Moleschi
>>moleschi@rmsweldingsystems•com
>>RMS Welding Systems
>>1409 - 4th Street, Nisku, Alberta CANADA T9E 7M9
>>Tel: (780)955-3907 Fax: (780)955-3996
>>
>>
>
>
>
>
--
Mike Moleschi
moleschi@rmsweldingsystems•com
RMS Welding Systems
1409 - 4th Street
Nisku, Alberta CANADA
T9E 7M9
Tel: (780)955-3907
Fax: (780)955-3996
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-11-12 19:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-12 18:39 Accessing nvram rom the linux users space Wright, David
2002-11-12 19:52 ` Mike Moleschi [this message]
2002-11-12 20:21 ` Kenneth Johansson
2002-11-13 9:53 ` Matthias Fuchs
-- strict thread matches above, loose matches on Subject: below --
2002-11-12 18:29 Mike Moleschi
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