AlexanderVasiljev opened a new pull request #3617:
URL: https://github.com/apache/incubator-nuttx/pull/3617
## Summary
This commit will correct error in the stm32H7 serial dma transmition.
txdmasem semaphore is posted every time in up_dma_txcallback. But it is
waited occasionally in up_dma_txavailable. So its value is always positive and
it never falls asleep.
This commit will use semaphore as resource holder
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