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Hi,

I guess your kernel is configured to support only 1GB of RAM. In the
kernel configuration look for "Processor Type and Features"
There you find the Option. High Memory Support.
Probably it is set to "off". Set it to 4GB then recompile the kernel.
That should do it.

have fun
Tom

José Pedro Saraiva wrote:
> Well, after all kinds of tests and trying different types of memory
> configurations, I can only conclude that my kernel boots normally with 1
> GB of RAM installed but hangs when I have 2 GB of RAM installed. I can't
> find a logical reason for this to happen.
>
> Any pointers or suggestions are welcome,
> Regards
>
> On Jan 19, 2008 11:31 PM, José Pedro Saraiva <nocive@gmail.com
> <mailto: nocive@gmail.com>> wrote:
>
>     Following your replies I've done the following, in an attempt to
>     isolate the problem:
>     (memory #1 - "old" memory, memory #2 - new memory)
>
>     - Runned memtest on both memories with 0 errors
>     - Booted with both memories... kernel hang
>     - Booted with memory #1 on slot #1 successfully
>     - Booted with memory #1 on slot #2 successfully
>     - Booted with memory #2 on slot #1 successfully
>     - Booted with memory #2 on slot #2 successfully
>     - Booted with both memories on windows successfully
>
>     For some reason, my kernel hangs if I have 2 GB of RAM installed.
>     And I do have High memory support (4GB), although that doesn't seem
>     relevant.
>     Ideas? :X
>
>     Thank you all for the quick replies.
>     Cheers
>
>
>     On Jan 19, 2008 2:29 PM, Hal Martin <hal.martin@gmail.com
>     <mailto:hal.martin@gmail.com>> wrote:
>
>         An alternative to running memtest (which is quite easy to do, I
>         might
>         add) would be to remove the original RAM and see if the computer
>         boots
>         with the new RAM only.
>
>         Alternatively, you could just run memtest, as it is included
>         with many
>         BIOSs now. It doesn't take long to identify problems, if there
>         are any.
>         I find that test #5 is the best test for finding problems,
>         however it
>         tends to keep you in the dark until it's finished the test.
>
>
>         -Hal
>
>
>         Neil Bothwick wrote:
>         > On Fri, 18 Jan 2008 22:58:59 +0000, José Pedro Saraiva wrote:
>         >
>         >
>         >> I'm sure there's nothing wrong with the RAM,
>         >>
>         >
>         > How? Have you run memtest?
>         >
>         >
>         >
>
>         --
>         gentoo-user@lists.gentoo.org
>         <mailto:gentoo-user@lists.gentoo.org> mailing list
>
>
>

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