From: Brian Gerst <bgerst@didntduck.org>
To: Guillaume Lancelin <guillaumelancelin@yahoo.es>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Memory access
Date: Tue, 03 Jul 2001 10:54:05 -0400 [thread overview]
Message-ID: <3B41DC8D.3316A7A8@didntduck.org> (raw)
In-Reply-To: <20010703144532.11007.qmail@web4201.mail.yahoo.com>
Guillaume Lancelin wrote:
>
> Writing a device driver for a IO card, I have the following message from
> the kernel:
> Unable to handle kernel paging request at virtual address 000d0804.
> [then it gives the register values]
> Segmentation fault."
>
> This address (0xd0804) is the location of a "mailbox" reserved by the IO
> card, and from which commands are passed to the card.
>
> My question: is the kernel using or protecting this area of the memory,
> and is there a way to deprotect it??? (how dangerous!)
Use ioremap()
--
Brian Gerst
next prev parent reply other threads:[~2001-07-03 14:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-03 14:45 Guillaume Lancelin
2001-07-03 14:51 ` Arnaldo Carvalho de Melo
2001-07-03 14:54 ` Brian Gerst [this message]
2001-07-03 14:56 ` Eli Carter
2001-07-03 14:57 ` Richard B. Johnson
2001-07-03 15:33 ` Alan Cox
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