From: Wolfgang Denk <wd@denx.de>
To: Dean Matsen <deanmatsen@earthlink.net>
Cc: Stephan Linke <Stephan.Linke@epygi.de>,
Linuxppc-Embedded <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: parallel I/O ports & opend darin pins on MPC8xx
Date: Wed, 09 Jul 2003 22:17:47 +0200 [thread overview]
Message-ID: <20030709201752.7D07FC6D82@atlas.denx.de> (raw)
In-Reply-To: Your message of "Wed, 09 Jul 2003 13:13:54 PDT." <3F0C7782.3060704@earthlink.net>
In message <3F0C7782.3060704@earthlink.net> you wrote:
>
> But I still don't see how you could avoid having other drivers clobber
> your output but. I think he has to take one of the two options I
By modifying _all_ drivers that will modify the port in question in a
way that is based on previously read data.
> suggested. Adding his own variable can't help in any way I can
> imagine. Could you give an example?
Find out which port pin(s) is/are configured as OD output. Check
which other port pins on this port are in use, and which drivers are
using these port pins. Make all these drivers use a common buffer
variable. Voila...
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
If a packet hits a pocket on a socket on a port,
And the bus is interrupted as a very last resort,
And the address of the memory makes your floppy disk abort,
Then the socket packet pocket has an error to report! - Ken Burchill?
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-07-09 20:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3F0C6C0C.8040306@earthlink.net>
2003-07-09 19:57 ` parallel I/O ports & opend darin pins on MPC8xx Wolfgang Denk
[not found] ` <3F0C7782.3060704@earthlink.net>
2003-07-09 20:17 ` Wolfgang Denk [this message]
2003-07-09 20:20 ` Dean Matsen
[not found] <FCEAKDJJAPHPLJFINDAJEEGGDEAA.Stephan.Linke@epygi.de>
2003-07-09 12:09 ` Wolfgang Denk
[not found] <FCEAKDJJAPHPLJFINDAJCEGCDEAA.Stephan.Linke@epygi.de>
2003-07-09 10:24 ` Wolfgang Denk
2003-07-08 15:31 Stephan Linke
2003-07-08 15:49 ` Craig Hollabaugh
2003-07-08 21:36 ` Wolfgang Denk
2003-07-09 4:57 ` None Atall
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