From: Coywolf Qi Hunt <coywolf@lovecn.org>
To: linux-os@analogic.com
Cc: "Peter W. Morreale" <peter_w_morreale@hotmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: Kernel memory limits?
Date: Fri, 18 Mar 2005 04:13:00 +0800 [thread overview]
Message-ID: <4239E4CC.7050007@lovecn.org> (raw)
In-Reply-To: <Pine.LNX.4.61.0503171401030.22694@chaos.analogic.com>
linux-os wrote:
> On Thu, 17 Mar 2005, Peter W. Morreale wrote:
>
>> (I did not see this addressed in the FAQs...)
>>
>> How much physical memory can the 2.4.26 kernel address in kernel
>> context on x86?
>>
>
> All of it.
>
>> What about DMA memory?
>>
>
> All of it, too. The old DMA controller(s) could only address 16 MB
> because that's all the page-registers allowed. Bus-mastering DMA
> off the PCI/Bus has no such limitation. Most have DMA controllers
> that use scatter-lists so RAM doesn't even have to be contiguous,
> only properly allocated (in pages) and nailed down with no caching.
>
Kernel Image itself resides at physical address 1M. Is this kernel image
area a hole to the old DMA range? Thanks.
Coywolf
next prev parent reply other threads:[~2005-03-17 20:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-17 18:06 Peter W. Morreale
2005-03-17 18:34 ` Dave Hansen
2005-03-17 19:08 ` linux-os
2005-03-17 20:13 ` Coywolf Qi Hunt [this message]
2005-03-17 20:51 ` linux-os
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