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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c3d0340b0501271755585c2b0b@mail.gmail.com \
--to=shawnxjin@gmail.com \
--cc=linuxppc-dev@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).