I believe it is 2Gb at present, and you must modify two files:
include/asm-i386/page.h : line 82 -->
old: #define __PAGE_OFFSET (0xC0000000)
new: #define __PAGE_OFFSET (0x80000000)
arch/i386/vmlinux.lds : line 9 -->
old: . = 0xC0000000 + 0x100000;
new: . = 0x80000000 + 0x100000;
The process is also documented in page.h.
When booting, don't bother to pull out ram or set the bios, just boot like
this:
linux mem=<n> -->
linux mem=256M
That will limit linux to 256Mb of ram, and allow you to boot. Easier than
pulling hardware out ;)
-brad
> Hi,
>
> I am looking to buy another SMP Linux box and wonder if
> there is a maximum limit on how much RAM I can put on that
> box. I want to put 4 GB if possible (a quad XEON 450MHz machine).
>
> I plan on installing RedHat 5.2 (2.0.36 kernel) and then upgrading
> to 2.2.7. I know the RedHat 5.2 does NOT like more that ~768 MB of
> RAM (won't boot correctly last time I tried). My fix for my 1 GB system
> was to pull out 256MB, load RH5.2, then put the extra 256MB back.
> A kludge, but it worked...
>
> Thanks,
>
> Leo
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