Patch Set 2:
The value of 280 is the minimum size needed to realize less ftdi_write_data() calls in patch 40477.
Nevertheless a value of 4096 would be reasonable as well.
In fact I can´t see any real need to set chunksize smaller than the default value (here: default equals to max) of the ftdi chunksize which equals to the ftdi buffer size (fix hardware buffer!).
A value of 4096 should result in the same behavior. However 280 is like having (/showing to have) some more control and knowledge about what happens.
I do not prefer any of the options. As there was possibly a reason to set chunksize smaller than the default value I chose 280.
I'm not sure if there's any particular reason to reduce the default bufsize.
Patch set 3:
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