Date: Mon, 15 Aug 2005 12:56:57 -0400 From: Martin Cracauer <cracauer@cons.org> To: freebsd-amd64@freebsd.org Subject: 4 GB RAM showing up as 3, BIOS memory hole and all that Message-ID: <20050815125657.A92343@cons.org>
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Somebody here must know this: I have a Dual Opteron board with 4x 1 GB RAM. The memory count in the BIOS goes up to 640 KB + 3072 MB, and FreeBSD says it sees 3 GB. I know/assume/heared this has to do with the I/O space placed in the upper GB and that you can re-map the top GB to avoid the problem. The BIOS has the options to have a memory hole which I set to 1 GB, thinking it would put the 3G-4G memory at 4G-5G instead. It seems I am wrong about this, I am stuck with 3 GB. Obviously I don't understand how that top GB for I/O works, how can that work when the machine has less than 3 GB? Any way to get my GB back? I know the hardware is OK by cross-checking all modules individually. And I can see that the memory bandwidth is that of dual-channel, so it is not a case of one stick not being recognized. Specs: - Armima Rioworks HDAMB, 2x Opteron 246, 4x 1 GB PC2100 - FreeBSD-7.0-current/AMD64, SMP kernel - dmesg, pciconf etc on http://www.cons.org/cracauer/machines/wings/ Thanks! Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer <cracauer@cons.org> http://www.cons.org/cracauer/ No warranty. This email is probably produced by one of my cats stepping on the keys. No, I don't have an infinite number of cats.
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