Linux 3.8: omap serial driver : write data sliced in two = why?

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I've a problem with my Program, I'm trying to send 14 bytes of data (one single call of write), but the data got sliced in two packet .... which make the other device respond with an crc error ..... why ? why the driver linux decide to cut my data ? do you know any configuration of the serial port that can prevent that ? or other solution ?

thank you very much !

!blue= rts , red = rs485 data

https://i.stack.imgur.com/N8beT.jpg

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