From: Jeff Garzik <jgarzik@mandrakesoft.com>
To: "MEHTA,HIREN (A-SanJose,ex1)" <hiren_mehta@agilent.com>
Cc: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: accessing on-card ram/rom
Date: Wed, 08 Nov 2000 17:53:11 -0500 [thread overview]
Message-ID: <3A09D957.4BC6F0@mandrakesoft.com> (raw)
In-Reply-To: <FEEBE78C8360D411ACFD00D0B74779718808E4@xsj02.sjs.agilent.com>
"MEHTA,HIREN (A-SanJose,ex1)" wrote:
> I have a PCI card which has on-card ram/rom which gets mapped
> into pci address space and there is a separate base register
> for this memory. Now the question is : can I access this on-card
> memory by converting the pci base address into the virtual address
> using bus_to_virt and adding the required offset ? Or do I need
> to use ioremap function to map the physical address space starting
> from the pci base address into the kernel virtual address space ?
> Or is there any other interface to access the on-card memory ?
> Is it that bus_to_virt can be used only for the normal RAM ?
Use ioremap.
For more details, read linux/Documentation/IO-mapping.txt.
Jeff
--
Jeff Garzik | "When I do this, my computer freezes."
Building 1024 | -user
MandrakeSoft | "Don't do that."
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next prev parent reply other threads:[~2000-11-08 22:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-08 22:48 accessing on-card ram/rom MEHTA,HIREN (A-SanJose,ex1)
2000-11-08 22:53 ` Jeff Garzik [this message]
2000-11-09 13:03 ` Richard B. Johnson
-- strict thread matches above, loose matches on Subject: below --
2000-11-08 22:57 hiren_mehta
2000-11-08 23:06 ` Jeff Garzik
2000-11-09 19:27 ` Gérard Roudier
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