From: Brian Gerst <bgerst@didntduck.org>
To: Svein Erling Seldal <Svein.Seldal@edcom.no>
Cc: linux-kernel@vger.kernel.org
Subject: Re: readw() access
Date: Wed, 01 Aug 2001 16:44:15 -0400 [thread overview]
Message-ID: <3B686A1F.B2409245@didntduck.org> (raw)
In-Reply-To: <NEBBLKFNEDOFBCDCJMLKCEAKCEAA.Svein.Seldal@edcom.no>
Svein Erling Seldal wrote:
>
> Hello,
>
> I'm trying to port a driver from 2.2.x to 2.4.x where I previously has used
> readw() to read the contents of the memory-adresses 0x408-0x40c (Where the
> BIOS gives you the adr. for the par-ports.) But on 2.4.x readw(0x408) Oops:
>
> "Unable to handle kernel NULL pointer dereference at virtual address
> 00000408"
>
> How do you read a memory-address like this?
>
> Svein Erling Seldal
Use isa_readw() or ioremap().
--
Brian Gerst
prev parent reply other threads:[~2001-08-01 20:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-01 20:33 readw() access Svein Erling Seldal
2001-08-01 20:44 ` Brian Gerst [this message]
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