From: Shawn Jin <shawnxjin@gmail.com>
To: linuxppc <linuxppc-dev@ozlabs.org>
Subject: Re: Relocating interrupt vectors in ppc440?
Date: Thu, 27 Jan 2005 17:55:01 -0800 [thread overview]
Message-ID: <c3d0340b0501271755585c2b0b@mail.gmail.com> (raw)
In-Reply-To: <20050127134117.D4266@cox.net>
> > I guess the value set to PPC_MEMSTART should be the offset to the
> > physical starting address of 2GB SDRAM not the absolute physical
> > address, right?
>
> It would be 0x00000000 for the first processor and 0x40000000 for the
> second processor. Note that head_44x.S is a major place where a lot
> of "system memory is at zero" assumptions take place that need to
> be addressed for the second processor.
The theory behind changing PPC_MEMSTART is to change MMU configuration
and to let it translate 0xC0000000 to 0x40000000 for the 2nd
processor. Right?
One place I found the assumption is when loading the kernel physical address.
/* Kernel is at the base of RAM */
li r4, 0 /* Load the kernel physical address */
I'll find out more places as you indicated.
Best regards,
-Shawn.
prev parent reply other threads:[~2005-01-28 1:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-27 18:05 Relocating interrupt vectors in ppc440? Shawn Jin
2005-01-27 18:16 ` Matt Porter
2005-01-27 20:18 ` Shawn Jin
2005-01-27 20:41 ` Matt Porter
2005-01-28 1:55 ` Shawn Jin [this message]
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