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SubjectRe: Kernel memory limits?
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


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