From: Parav Pandit <paravpandit@yahoo.com>
To: "David H. Lynch Jr." <dhlii@dlasys.net>,
Clint Thomas <cthomas@Soneticom.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Define Linux system memory
Date: Wed, 20 Dec 2006 23:05:28 -0800 (PST) [thread overview]
Message-ID: <588266.74305.qm@web36606.mail.mud.yahoo.com> (raw)
In-Reply-To: <458A2289.4070401@dlasys.net>
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Hi,
This memory information is passed by the u-boot in bd_info structure (typedef to bd_t).
Its defined in include/asm-ppc/ppcboot.h file.
First two parameters specify the start address and length.
Well, I'll at least try on my host x86 system. There is doesn't get from the grub.
It should work and I should be able to see in cat /proc/meminfo.
I'll try and let you know.
Regards,
Parav Pandit
"David H. Lynch Jr." <dhlii@dlasys.net> wrote:
Clint Thomas wrote: To anybody who has done this before or understands how to do this, I was wondering if you know how to "tell" the kernel how much memory there is in the system. An example would be if I have 512MB of RAM, but only want the system to know that there is about 500MB in RAM, so that 12MB does not exist to the OS/kernel. Would this require mucking about in U-boot? or can I just define this in the kernel source? Thanks
Clinton Thomas
Most bootloaders including u-boot pass a board information structure that includes a variety of information including the memory size.
Also I think top of memory is also typically passed to the Linux Kernel as a register parameter by the boot loader.
---------------------------------
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-- Dave Lynch DLA Systems Software Development: Embedded Linux 717.627.3770 dhlii@dlasys.net http://www.dlasys.net fax: 1.253.369.9244 Cell: 1.717.587.7774 Over 25 years' experience in platforms, languages, and technologies too numerous to list. "Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction." Albert Einstein
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prev parent reply other threads:[~2006-12-21 7:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-20 16:52 Define Linux system memory Clint Thomas
2006-12-20 16:57 ` Frank
2006-12-20 18:02 ` Clint Thomas
2006-12-21 5:58 ` David H. Lynch Jr.
2006-12-21 7:05 ` Parav Pandit [this message]
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