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
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