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From: "yanjun.luo" <yanjun.luo@gmail.com>
To: "Bruce_Leonard@selinc.com" <Bruce_Leonard@selinc.com>,
	"linuxppc-embedded@ozlabs.org" <linuxppc-embedded@ozlabs.org>
Subject: Re: How do I access nvRAM from user space?
Date: Thu, 25 Sep 2008 13:45:06 +0800	[thread overview]
Message-ID: <200809251345052340726@gmail.com> (raw)
In-Reply-To: OFFC64870C.57753273-ON882574CF.001088E7-882574CF.001228E4@selinc.com

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Hi Bruce,
You can use mmap to access NVRAM from user space, but you should config 
local bus first, like width, speed etc.

Regards,
Yanjun Luo.




发件人： Bruce_Leonard@selinc.com 
发送时间： 2008-09-25  11:44:56 
收件人： linuxppc-embedded@ozlabs.org 
抄送： 
主题： How do I access nvRAM from user space? 
 
Sorry for the dumb question, I just can figure out the right google search 
to find what I'm trying to do.  I'm running 2.6.27-rc4 on an mpc8347 with 
a 32KiB nvSRAM (Cypress CY14B256L) on the local bus.  We just want to be 
able to access this memory from user space seperately from "main" memory. 
We've got a process that needs to be able to remember info through power 
cycles.  Can anyone point me to an article or some code snippet that does 
something like this so I can sink my teeth into it?
Bruce
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  reply	other threads:[~2008-09-25  5:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-25  3:18 How do I access nvRAM from user space? Bruce_Leonard
2008-09-25  5:45 ` yanjun.luo [this message]
2008-09-25 15:53 ` David Hawkins
2008-09-25 17:18   ` Bruce_Leonard
2008-09-25 18:13     ` Bruce_Leonard
2008-09-25 18:14     ` David Hawkins

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