Has anyone successfully read data from the physical address created by
AllocateCommonBuffer. I find that I can write to the address by using my
BUS master DMA device, but cannot read from it.
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> Has anyone successfully read data from the physical address created by
AllocateCommonBuffer. I find that I can write to the address by using my
BUS master DMA device, but cannot read from it.
So, what happens when you read?
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What I read is not what I wrote through the virtual addres in the WDM
driver. I always read the same garbage. It never changes.
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NT often permanently maps all of the physical memory to the virtual
80000000h. Try to use this to debug your problem.
— John Allen wrote:
> What I read is not what I wrote through the virtual addres in the WDM
> driver. I always read the same garbage. It never changes.
>
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----- Original Message -----
From: “Ntdev Reader”
To: “NT Developers Interest List”
Sent: Wednesday, January 30, 2002 5:39 PM
Subject: [ntdev] Re: reading the AllocateCommonBuffer physical address
> NT often permanently maps all of the physical memory to the virtual
> 80000000h. Try to use this to debug your problem.
Not all, just the first 512MB.
-DH
>
> — John Allen wrote:
> > What I read is not what I wrote through the virtual addres in the WDM
> > driver. I always read the same garbage. It never changes.
> >
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>
>
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