davids5 opened a new pull request, #11020:
URL: https://github.com/apache/nuttx/pull/11020
## Summary
The DMA can bring in more rx data, than the number of
DMA completions call backs. The call backs happen on
idle, 1/2 and full events. But in between these events
the DMA can write more data to the buffers memory that
need to be brought in to the cache. (invalidate)
We do the invalidate on the reads from the fifo memory
if the the DMA as commited since the last read.
## Impact
There is dropped data at high baud rates.
## Testing
imxrt1170 px4 nxp_fmurt1170-v1
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