From: Jan Kiszka <jan.kiszka@domain.hid>
To: Perrine Martignoni <perrmart@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] RTDM mmap and DMA
Date: Tue, 18 Dec 2007 13:47:49 +0100 [thread overview]
Message-ID: <4767C175.7060907@domain.hid> (raw)
In-Reply-To: <7289437c0712180212l6d47beb5r5766386d333456c1@domain.hid>
Perrine Martignoni wrote:
> Thanks for the explanation.
> But how can I do to allocate the DMA area ? with the Dma-api of Linux or
> Xenomai offers the possibility to do this ? and what about memory heap with
> H_DMA ?
> I'm a bit confused with all of this.
Yes, allocation and registration (pci_map*/pci_unmap*) is intended to
run via normal Linux. H_DMA (if you were using heaps here), which leads
to GFP_DMA, is only involved for old ISA hardware.
Jan
--
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2007-12-18 12:47 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-14 11:24 [Xenomai-help] RTDM mmap and DMA Perrine Martignoni
2007-12-18 9:21 ` Stéphane ANCELOT
2007-12-18 9:29 ` Jan Kiszka
2007-12-18 10:10 ` Gilles Chanteperdrix
2007-12-18 10:16 ` Perrine Martignoni
2007-12-18 10:18 ` Gilles Chanteperdrix
2007-12-18 10:12 ` Perrine Martignoni
2007-12-18 12:47 ` Jan Kiszka [this message]
2007-12-18 13:20 ` Gilles Chanteperdrix
2007-12-18 14:11 ` Perrine Martignoni
2007-12-18 14:22 ` Jan Kiszka
2007-12-18 14:41 ` Perrine Martignoni
-- strict thread matches above, loose matches on Subject: below --
2007-12-14 13:59 Fillod Stephane
2007-12-14 15:50 ` Perrine Martignoni
2007-12-23 13:09 ` Gilles Chanteperdrix
2007-12-26 23:37 ` Gilles Chanteperdrix
2007-12-17 14:40 Fillod Stephane
2007-12-18 17:40 Fillod Stephane
2007-12-18 17:55 ` Gilles Chanteperdrix
2007-12-27 15:39 Fillod Stephane
2007-12-27 15:43 ` Gilles Chanteperdrix
2007-12-28 21:59 ` Gilles Chanteperdrix
2008-01-03 18:40 Fillod Stephane
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