FW: Kernelnewbies Digest, Vol 5, Issue 20

[ashutosh mishra]

>hi all..
>i have been working on char device driver.
>i need a good document on advance char device driver..?

> From: kernelnewbies-request at kernelnewbies.org
> Subject: Kernelnewbies Digest, Vol 5, Issue 20
> To: kernelnewbies at kernelnewbies.org
> Date: Thu, 14 Apr 2011 12:00:01 -0400
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> Today's Topics:
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>    1. Re: Missing 1GB RAM, where is it? (Andrzej Kardas)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 14 Apr 2011 17:43:05 +0200
> From: Andrzej Kardas <andrzej-kardas at o2.pl>
> Subject: Re: Missing 1GB RAM, where is it?
> To: Adrian Cornish <adrianc at cqg.com>
> Cc: kernelnewbies at kernelnewbies.org
> Message-ID: <4DA71609.5070800 at o2.pl>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> 
> 
> On 14.04.2011 17:09, Adrian Cornish wrote:
> > Just a thought - lower end graphic cards use system RAM as their own
> > dont they
> You right, devices like graphic card, ethernet cards etc. are mapped 
> into memory, what cause some amount RAM is not available for system use. 
> But as i've wrote before, i'm wondering why addresses in /proc/iomem 
> (where the map of memory is) are not contiguous. I think, there should 
> be info about what region of memory is mapped where (BIOS, PCI bus, for 
> system use etc)*for whole 4GB *(Am I right??) address space (for 32bit 
> OS). Instead of that, there are small "holes" in addresses and the total 
> size of this holes (in my case) is about 400MB. So i wonder where that 
> memory is.
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> End of Kernelnewbies Digest, Vol 5, Issue 20
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