From: Kalle Pokki <kalle.pokki@iki.fi>
To: "David H. Lynch Jr" <dhlii@comcast.net>
Cc: linuxppc-embedded <linuxppc-embedded@ozlabs.org>
Subject: Re: Need help Understanding initial memory conditions.
Date: Tue, 18 Oct 2005 10:49:11 +0200 [thread overview]
Message-ID: <4354B707.6060002@iki.fi> (raw)
In-Reply-To: <4354AC78.5080206@comcast.net>
David H. Lynch Jr wrote:
> What exactly is the minimal startup system state the Linux 2.6.13
> Kernel expects ?
It's pretty hard to describe the system state fully, as there are so
many registers it may depend on. However, I can point out a few things
from your setup:
1. Put RAM to 0x0000000 and flash to some location it mirrors to your
boot vector. Linux always expects your physical memory to be at zero. It
is then mapped to virtual address 0xC0000000.
2. You don't need to have MMU enabled.
3. Make sure your boot arguments are passed properly to the kernel. This
includes the settings in registers r3 ... r7 and the bd_info structure .
There are many variants of that structure, make sure you use the same
ones in the boot loader and in Linux.
next prev parent reply other threads:[~2005-10-18 8:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-18 8:04 Need help Understanding initial memory conditions David H. Lynch Jr
2005-10-18 8:49 ` Kalle Pokki [this message]
2005-10-18 19:15 ` David H. Lynch Jr.
2005-10-18 20:14 ` Kalle Pokki
2005-10-19 5:16 ` David H. Lynch Jr
2005-10-19 6:37 ` Kalle Pokki
2005-10-19 10:24 ` Andrei Konovalov
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