From: Scott Wood <scottwood@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] io.h
Date: Tue, 5 Jan 2010 13:59:27 -0600 [thread overview]
Message-ID: <20100105195927.GA26296@loki.buserror.net> (raw)
In-Reply-To: <BEFE4DF574034B49B4B921F93110FCA6@CT.itrc.ac.ir>
On Sat, Dec 19, 2009 at 11:40:40AM +0330, seyyed morteza havaedgi wrote:
> I working on mpc8272. in the file io.h there is "twi 0,RA,0" instruction.
> what this instruction means and what it does? In accordance with powerpc programmers manual this instruction must do nothing because the TO field is zero.
It turns a data dependency on RA into a flow control dependency (even though
the decision always ends up being not to trap), which can then be ordered by
a following isync.
-Scott
prev parent reply other threads:[~2010-01-05 19:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-19 8:10 [U-Boot] io.h seyyed morteza havaedgi
2010-01-05 19:59 ` Scott Wood [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=20100105195927.GA26296@loki.buserror.net \
--to=scottwood@freescale.com \
--cc=u-boot@lists.denx.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.