linux-kernel - Re: [newb] mmap pci

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Message-ID: <20080416065217.22691d34@laptopd505.fenrus.org>
Date:	Wed, 16 Apr 2008 06:52:17 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Neal Becker <ndbecker2@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [newb] mmap pci

On Wed, 16 Apr 2008 07:23:29 -0400
Neal Becker <ndbecker2@...il.com> wrote:

> We have a device - an FPGA board on PCI bus.  It has a range of
> internal memory mapped to PCI.  I want to expose this to user via
> mmap.  Is there some example code someone could point me to?
> 
> If this is not the best forum for such questions, what would be a
> better choice?

Hi,

if it's just a PCI bar, you can already memory map it without even writing a driver!
You can just use the sysfs files for this, for example
/sys/devices/pci0000:00/0000:00:02.0/resource1

There's also a way to do this via the /proc representation of the PCI device..

Greetings,
   Arjan van de Ven


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