From: Thiemo Seufer <ths@networkno.de>
To: Stefan Weil <weil@mail.berlios.de>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 2/6] A cumulative MIPS patchset
Date: Tue, 28 Nov 2006 18:47:28 +0000 [thread overview]
Message-ID: <20061128184728.GA22980@networkno.de> (raw)
In-Reply-To: <456C77F6.8000202@mail.berlios.de>
Stefan Weil wrote:
> Hello Thiemo,
>
> my reboot patch for MIPS
> (http://lists.gnu.org/archive/html/qemu-devel/2006-09/msg00082.html)
> is only partially included in Daniel's patch.
>
> As far as I know, a MIPS triggers the reboot exception at power-on.
> (at least for MIPS 4KEc), so my patch uses the same code for reboot
> exception and power-on.
Actually, a MIPS has no notion of "reboot". Is starts up by executing
from the reset vector at 0xbfc00000, which is the place where the
firmware ROM resides. A "soft reset" exception could be used to signal
reboot, but that is then handled by software, and system specific.
> Why do we need a special QEMU reset device in the Linux kernel?
> QEMU might emulate existing real reset devices as well...
Because we want to have both reboot and halt for linux, and ATM
we have no firmware in Qemu to handle that.
Given the number of incompatible MIPS firmwares out there it might
be a bad idea to rely on any of those, unless we improve the Qemu
emulation to resemble a real system with its respective firmware.
Thiemo
prev parent reply other threads:[~2006-11-28 18:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-21 14:37 [Qemu-devel] [PATCH 2/6] A cumulative MIPS patchset Thiemo Seufer
2006-11-28 17:55 ` Stefan Weil
2006-11-28 18:47 ` Thiemo Seufer [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=20061128184728.GA22980@networkno.de \
--to=ths@networkno.de \
--cc=qemu-devel@nongnu.org \
--cc=weil@mail.berlios.de \
/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).