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Date: Wed, 24 Apr 2013 14:41:14 +0200
From: Kai Bollue <mlist1@bollue.de>
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Subject: Re: [Xenomai] Sporadic freeze using RTnet
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Xenomai <xenomai@xenomai.org>

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