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high mem support is required for ram >=1 GB
maybe u are u using a kernel which has that turned off
u will have to recomile ur kernel for that or see if ur distro provides a precompiled kernel with high mem support
thought it might be that, anyone know a precompiled kernel image that has Highmem, SATA and RAID precompiled in thatI can just apt-get? or will I need to get one of the source packages and use make-kpkg ?
The default kernel configuration from Debain does have high memory support turned off. You can turn it on by recompiling your kernel. Just use the existing kernel configuration as a starting point, run make menuconfig and select: Processor type and features--->High Memory Support. Change it from "Off" to "4GB". Then recompile your kernel. I wrote a step-by-step procedure for compiling a kernel that is a sticky at the top of this forum. There is also an excellent guide here: http://newbiedoc.sourceforge.net/system/kernel-pkg.html
Actually, I *think* that if you just upgrade your kernel using your favorite package manager (dselect, aptitude, synaptic, etc.) then you should be good to go. I have done this before and found that the kernel upgrades that come out tend to be compiled for 4gb environments, and that the kernel that is installed for an initial install is limited to the <1gb frame.