Serial port change proposal

Does anyone know why we continue to disable ‘ignore dcd’ (OS_SerialOp 0 bit 1) by default on the the default serial ports? The ports that are not the default on a machine have this bit set. Having this bit clear causes receiving to fail on the iyonix, pandaboard and armx6 – the only ones I can test. As I see it it just makes it difficult for everyone as using Serial: appears not to work – you can’t modify the bit from the DeviceFS interface you have to use OS_SerialOp but no-on knows you need to use it for the default ports.

I think we should change it to be the same as the other ports so that opening serial will work. Legacy programs that use SerialDev will already do a SYS “OS_SerialOp”, 0, 2, NOT 2 to enable receiving – new users shouldn’t have to.

I also think that the default handshake should be nohandshake instead of rts so that early experiments don’t lock up the machine.

Anyone think of a reason not to make the changes.

Then we just need to add a special field and ioctl interface to the Serial module to get all serial ports to work the same. This is the reason why you can’t configure the Serial: interface on an Iyonix via the special fields (Serial ports use the Dualserial module which has this interface, Serial: uses the Serial module).