x86_64 - 4 Gig DRAM 500Meg missing
Dave Jones
davej at redhat.com
Fri Jun 24 20:27:58 UTC 2005
On Fri, Jun 24, 2005 at 12:43:29PM -0700, Wolfgang S. Rupprecht wrote:
>
> I'm trying to understand what I need to do to make the last 500Meg of
> my 4GB memory visible on a FC4 x86_64. I assume that the 3.5GB - 4GB
> area is being used for hardware and I need to arrange for the memory
> to be mapped elsewhere.
Correct, you'll need some space in the lower 4GB for PCI to mapped.
> My motherboard, a tyan k8e (s2865) has entries in the bios for
> something called:
>
> S/W memory hole Remapping disable / enable
> H/W memory hole Remapping disable / enable
> MTRR mapping mode continuous / discrete
>
> It looked like one or both of the first two entries would do the
> trick, but when I enabled them all that happened was my add-in network
> card stopped working. At boot dhcp was unable to get an address and
> booting hung at that point. This happened s/w or h/w remapping was
> active (either singly or together.
Hmm, usually such an option does the trick. Is there a newer BIOS
you can try perhaps ? It's not really a problem that we can do anything
about sadly.
Dave
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