Suggestions for good IO embedded cpu

I'm seeking feedback from this experienced group on good choices for
embedded processors for
use in I/O intensive PCI cards.

We had selected the PPC440GP, but have since learned of the DMA problems it
has, which we
believe will impact the I/O throughput.

It would be great if the cpu were already supported by u-boot and linux.

Thanks for any thoughts or experiences you've had, good or bad.

-- Brian


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