How to make kernel recognize 4GB of RAM

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Hi, How to make the kernel recognizes 4 GB of RAM memory ?

It is a Lenovo T400 Laptop.
Fedora 12
2.6.32.11-99.fc12.i686 #1 SMP Mon Apr 5 16:32:08 EDT 2010 i686 i686
i386 GNU/Linux

$ head -1 /proc/meminfo
MemTotal:        3057360 kB


dmesg shows
total RAM covered: 3998M

The BIOS shows 4 GB of RAM memory

Looks like the kernel initially recognizes the 4 GB, but is unable to
use it, is that right ?

I read elsewhere that if there are more than 4 GB of RAM, the
kernel-pae is necessary, but my laptop doesn't have more than 4 GB.

So, is it possible to have the kernel recognizes the 4 GB ? With or
without the kernel-pae ?

Thanks

--
 Claudio Miranda
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 http://www.claudius.com.br   claudio(o)claudius.com.br
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