From: Callebaut Benoit <callebaut@mailandnews.com>
To: linuxppc-embedded@lists.linuxppc.org
Subject: Linux & DMA transfer (applied to 8245)
Date: Thu, 24 Apr 2003 10:58:44 -0400 [thread overview]
Message-ID: <3EB17B45@mailandnews.com> (raw)
Hi ,
I am implementing DMA transfers initiated by the processor for the MPC8245.
Since the standard pci_alloc_consistent take only a pci_dev structure but no
addresses, I added a configuration function to set the target address (PCI)
and the other parameters.
I can see that the DMA transfer is started, and finished (an interrupt is
generated) but I don't see the data copied on the target device ( DSP with a 4
MB memory window on PCI bus.)
My question is : What type of addreess must I give to configure the DMA
controller.
Are there also caching issues that may prevent good read/write operation
s? I suppose that the flushing og the cache done in pci_alloc_consistent is
enough.
Thanks
------------------------------------------------------------------------------
----
Benoit Callebaut
Software Development Engineer
Barco | Control Rooms
Noordlaan 5, 8520 Kuurne, Belgium
Tel +32(0)56 36 84 28
Fax +32(0)56 36 86 05
mailto:benoit.callebaut@barco.com
http://www.barcocontrolrooms.com
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
reply other threads:[~2003-04-24 14:58 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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=3EB17B45@mailandnews.com \
--to=callebaut@mailandnews.com \
--cc=linuxppc-embedded@lists.linuxppc.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 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.