4 GiB RAM Blues

[Jonathan Hudson]

On Mon, 10 May 2010 14:21:36 +0300, Amichai Rotman wrote:

>Hi Jonathan,
>
>I saw nothing like that explicitly, except the DVMT memory reseve for video.
>I have an add-in PCIx card, how can I set this to 0?
>
>I have version 1.14 of the BIOS. Here is a link to my machines details:
>
>http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=vn&taskId=120&prodSeriesId=3352967&prodTypeId=12454&objectID=c01056911
>

Not sure now I can help further, as this is BIOS specfic (e.g. on my
only 64bit box, with a 4 year old ASRock 939Dual-SATA2 mobo and AMI
BIOS, there's an option under Advanced/CPU Configuration => Memory Hole
which has to be set to "enabled" to see 4GB (vice 3.2GB) RAM in 64bit
Linux. This is not mentioned in the Mobo Manual and required a BIOS
upgrade a couple of years ago to work.

-jonathan


>Thanks!
>
>.:====================================================:.
>
>Amichai Rotman
>
>Registered Linux User#: 201192 [http://counter.li.org/]
>Registered Ubuntu User #12851 [http://ubuntucounter.geekosophical.net]
>
>------------------------------------------------------------------------------------------------------------
>.:====================================================:.
>
>
>On Sun, May 9, 2010 at 20:58, Jonathan Hudson
><jh+ubuntu at daria.co.uk<jh%2Bubuntu at daria.co.uk>
>> wrote:
>
>> On Sun, 9 May 2010 20:35:51 +0300, Amichai Rotman wrote:
>>
>>
>> >64Bit: Same test gave my ~3200 Kb total memory...
>> >
>> >I don't get it.... How can the 64Bit show less?
>> >
>>
>> For 64 bit OS:
>>
>> It's a BIOS setting, something to do with "memory remapping" or
>> "memory holes", to do woth how the BIOS maps system or video ROMs or
>> memory into the address space for 32bit OS (the BIOS cannot know what
>> you're going to boot). Have a hunt around the BIOS setup, it's a pretty
>> common problem and the solution is BIOS dependent.
>>
>> -jh
>>
>>
>>
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>