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Guidelines to make RT patch for driver

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on my AT91SAM9263 based board RT patched kernel works great! Thanks to all involved. But when ethernet is in use - latency, measured by cyclictest, reach 7000000 and beyond. The ethernet driver for this processor is macb.c. (in 3.2 it is in drivers/net/ethernet/cadence, in 3.0 it is in drivers/net/). I'm ready to find out how to RT-patch it and of course share the resulted patch, but I need some starting point for patching drivers besides general RT-stuff. I've noticed that some network drivers patched in one way and others a in another. Maybe some discussion existed which I didn't found. So any help would be greatly appreciated.
Thanks in advance,

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