From: "David S. Miller" <davem@redhat.com>
To: "Randall Hyde" <randyhyde@earthlink.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mmap to Access PCI space?
Date: Fri, 24 Oct 2003 00:57:50 -0700 [thread overview]
Message-ID: <20031024005750.114ab4fb.davem@redhat.com> (raw)
In-Reply-To: <06d801c399df$f8af9880$6501a8c0@rhyde>
On Thu, 23 Oct 2003 20:36:12 -0700
"Randall Hyde" <randyhyde@earthlink.net> wrote:
> I need to access a couple of SATA chips from a user-mode
> program (yep, running as root). I know for a fact that my
> chip resides at address 0xfc300000 (/proc/iomem and /proc/ide/siimage
> tells me this). Can I do a mmap like the following to access the registers
> on ths chip?
>
> fdDevMem = open( "/dev/mem", O_RDWR );
> ptr =
> mmap
> (
> NULL,
> 4096,
> PROT_READ | PROT_WRITE,
> MAP_SHARED,
> fdDevMem,
> 0xfc300000
> );
That's not portable and will only work on a few platforms.
Please use mmap() and ioctl() operations on /proc/bus/pci/*
nodes to accomplish your task.
next prev parent reply other threads:[~2003-10-24 7:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-24 3:10 2.6.0-test8 scsi logging not working jtholmesjr
2003-10-24 3:36 ` mmap to Access PCI space? Randall Hyde
2003-10-24 7:57 ` David S. Miller [this message]
2003-10-24 5:17 ` 2.6.0-test8 scsi logging not working Mike Anderson
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