???? wrote:
Hello everyone,
I try to port EMC2 to Mini2440, a platform based on S3C2440 ARM9 processor.
I want to ask if anyone have ported EMC2 to platforms based on arm
processors.
We tried this by getting a Beagle Board and sending it to Torsten Koschorrek
in Germany. He is the ARM maintainer for RTAI. That was 18 months ago,
and he still has not produces a port for the Beagle. There is a Source Forge
project on this
http://sourceforge.net/projects/rtai-cortex/
Lately, it seems there has been work on adding the rt-preempt kernel
to thise supported by our rtapi interface, and there is an rt-preempt kernel
for the Beagle, so that might be close.
One nasty thing we found out on the Beagle is that the OMAP CPU has
multiplexed GPIO hardware, so the GPIO pins can only be updated every
240 ns (either read or write). Apparently accessing the GPIO also
incurs a 240 ns wait state to the processor. This was SO WELL hidden in
the TI OMAP manual that I still can't find any place where this bottleneck
is fully described.
Jon
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