RAM size configuration in IXP425

[Manasvini <manasvini@xxxxxxxxxxx>]

Hi all,
I am using an IXP425 based board which is configured with 64 MB RAM.When
the board is reset and redboot comes up, it shows only 32 MB of RAM.In
the kernel configuration , in  General Setup->default kernel command
string : when i set mem=32M@0x00000000 and run all my applications it
works fine, except that my system requires more system RAM than that.

when i modify this to mem=64M@0x00000000 the kernel boots up fine and
some applications ( that together consume less than 32 MB of RAM)run
ok.even 'top' shows about 62 MB of total memory

But when I load some other RAM intensive applications I get oops errors,
or kernel panic (unable to handle paging request at virtual address or
kernel null pointer dereferencing ).

Is there some other configuration option that I need to setup for using
the whole 64 MB or something else that I have missed out?Does whatever
redboot shows  have anything to do with how much RAM we have access to
in the system?.
Thanks in advance,
Manasvini




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