Hi, On Wednesday 06 August 2008, Aristeu Rozanski wrote: > This patch adds support for DTR/DSR hardware flow control on 8250 driver on > x86 machines. It's done by adding a CDTRDSR flag to work just like CRTSCTS, > which is not done on other architectures on purpose (so each maintainer can > allocate it). It's funny, serial flow control hasn't been discussed for a long time, and you're the third person to start a flow control related thread on this mailing list in a few days. > This patch was tested with success with a serial printer configured with a > small buffer and DTR/DSR flow control. > > This is based on the work of Michael Westermann > (http://lkml.org/lkml/2007/8/31/133) > > Comments more than welcome. Please read the '[PATCH/RFC] 8250: Auto RS485 direction control' thread for background information. In a nutshell we need more than just CTS/RTS and DTR/DSR, and we don't have enough c_cflags bits. We will probably have to create a new ioctl. Best regards, -- Laurent Pinchart CSE Semaphore Belgium Chaussee de Bruxelles, 732A B-1410 Waterloo Belgium T +32 (2) 387 42 59 F +32 (2) 387 42 75
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