RE: RAM size configuration in IXP425

["George Joseph" <gtj.member@xxxxxxxxxx>]

Well if Redboot doesn't report the memory and the kernel oopses when you force it to think there's 64M you might want to think about
a hardware problem.  You've pretty much eliminated Redboot as a problem by forcing the memory size from the kernel command line with
no success.  I'm certain that neither Redboot nor the kernal have problems with ixp425's with 64M of memory.

Are you using an existing board or one of your own design?

I hate to ask but are you SURE 64M is installed?
Socketed or soldered in?  Can you swap the chips around and see what happens?
How many chips? What size and configuration? 
4 8Mx16 chips or 2 16Mx16 chips.
If 2 chips are they in the same bank?
If 4 chips are they in 2 banks with 2 chips per bank?
CS, DQM, and DATA lines correctly routed for the number of chips?


-----Original Message-----
From: linux-arm-bounces@xxxxxxxxxxxxxxxxxxxxxx [mailto:linux-arm-bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Manasvini
Sent: Thursday, February 03, 2005 7:22 PM
To: linux-arm@xxxxxxxxxxxxxxxxxxxxxx
Subject: RAM size configuration in IXP425


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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