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From: Kai Bollue <mlist1@bollue.de>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Xenomai <xenomai@xenomai.org>
Subject: Re: [Xenomai] Sporadic freeze using RTnet
Date: Wed, 24 Apr 2013 14:41:14 +0200	[thread overview]
Message-ID: <5177D2EA.7060306@bollue.de> (raw)
In-Reply-To: <51778E9A.7090206@siemens.com>

On 24.04.2013 09:49, Jan Kiszka wrote:
> Yep, that's it, thank you very much.
>
> Does the rt_8139too driver support pre-mapping?
> Nope, only the two I mentioned (simply because they are more common on
> platforms that have >4G and/or an IOMMU). But - wait - the 8139too has a
> fixed DMA window (due to some older chips) and therefore does copying
> to/from a pre-allocated bounce buffer on its own. That makes it work
> with IOMMUs as well.

OK, this means that cards using the RTL 8139 are currently the only 
non-Intel cards that work correctly with RTnet and > 4 GB of RAM, right?
Maybe this information should be put somewhere googleable, as modern 
systems tend to have much RAM - and often still PCI slots.

Thanks again for your help.


Regards,
Kai


  reply	other threads:[~2013-04-24 12:41 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-22 17:50 [Xenomai] Sporadic freeze using RTnet Kai Bollue
2013-04-23 12:18 ` Jan Kiszka
2013-04-23 13:53   ` Kai Bollue
2013-04-23 14:05     ` Jan Kiszka
     [not found]       ` <5176AB28.7000305@bollue.de>
2013-04-23 15:43         ` Jan Kiszka
2013-04-23 17:12           ` Kai Bollue
2013-04-23 17:18             ` Jan Kiszka
2013-04-23 19:28               ` Kai Bollue
2013-04-24  7:49                 ` Jan Kiszka
2013-04-24 12:41                   ` Kai Bollue [this message]
2013-04-25 16:16                     ` Jan Kiszka
2013-04-29 18:34                       ` Kai Bollue
2013-04-29 18:42                         ` Jan Kiszka
2013-05-02 17:05                           ` Kai Bollue
2013-05-09 10:47                             ` Jan Kiszka

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