Re: [Xenomai] Sporadic freeze using RTnet

[Jan Kiszka <jan.kiszka@web.de>]

On 2013-04-24 14:41, Kai Bollue wrote:
> 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.

True. There is an RTnet-related section on the Xenomai Wiki, and I'm
always open for patches against the in-tree doc of RTnet.

Jan


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