Joakim Tjernlund wrote:
Scott Wood <scottw...@freescale.com> wrote on 30/03/2009 19:22:03:
Joakim Tjernlund wrote:
gianfar does not seem to use in_/out_ functions for the BDs. Works
just
fine that too it seems.
It does now that it has explicit barriers in a few places. Before they
In 2.6.29 or later?
No, it was earlier.
were added, it would sometimes fail under load. That was due to a
compiler reordering, but CPU reordering was possible as well.
Does not the CPU skip reordering if the guarded bit is set?
The guarded bit is typically not set for DMA buffers. ucc_geth is a bit
different since descriptors are in MURAM which is ioremap()ed -- though
switching to a cacheable mapping with barriers should be a performance
improvement.
-Scott
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