Hi the thing with only checking !TXEMPTY is that it limits the fifo to one byte only; and as far as i understood, drivermodel code is supposed to return immediately and not block possibly waiting indefinitely for a hardware/status register to change
a colleague pointed out the use of barriers in the quoted kernel code snippet -> are we perhaps running into code-reordering issues; that checking the status flags and writing into the queue gets out of sync? regards
