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From(H. Peter Anvin)
SubjectRe: [patch] 2.1.89, 2GB physical memory, CONFIG_MAX_MEMSIZE
Date9 Mar 1998 06:18:32 GMT
Followup to:  <Pine.LNX.3.96.980309032803.23721A-100000@chiara.csoma.elte.hu>
By author:    MOLNAR Ingo <mingo@chiara.csoma.elte.hu>
In newsgroup: linux.dev.kernel
> 
> On Sat, 7 Mar 1998, Trevor Johnson wrote:
> 
> > > Does there exist a patch for 2.0.33 that will permit the use of
> > > 2GB of physical memory?
> > 
> > Ingo Molnar made a patch for 2.1.77 or so.  I think it only works with the
> > Pentium Pro. [...]
> 
> the patch works on my 2x P5 SMP board also. Here is a new version against
> 2.1.89, it removes all those hardcoded constants and adds
> CONFIG_MAX_MEMSIZE, max physical memory is settable: 
> 
>                 (Pentium/K5/5x86/6x86) Processor family
>                 [ ] Math emulation
>                 [*] More than 1 gigabyte physical memory
>                 (0x80000000)  Max physical memory
> 
> this constant is properly fed into all other kernel places, there should
> be no more 0xc0000000 dependencies left. Both 2G/2G and 3G/1G splits have
> been sanity booted and i havent had any problems so far.
> 
> [there still seem to be lots of compile-time dependencies on PAGE_OFFSET,
> so that making it a config-time option seems to be the right solution.
> There would be too much overhead from a run-time setup i think.]
> 

Perhaps it would be saner to specify this number in megabytes; it
could be decimal then.

	-hpa
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