Serial port timing with FTDI USB serial FT232 is messed up.

[Rob Frohne]

With this real time kernel, when I use the ttyUSB0, it appears that the serial port doesn't work right. I am using it to access my ham radio with hamlib, and gtkterm. Everything works fine with the generic kernel, but with the real time kernel here, the first three characters "IF;" don't all get through. It doesn't matter if I use hardware handshaking or none, the communication always gets stuck there. If I play with toggling the RTS signal in gtkterm, and mess around with it, I can get some responses sometimes. Once it starts working, it seems okay, at least for a while, but everytime I reboot into the real time kernel it doesn't work. And in the generic kernel it works both with and without hardware handshaking. Here is a web page detailing my setup:

http://people.wallawalla.edu/~Rob.Frohne/SDR/USB%20Interface/IF-232%20USB%20Replacement.html

I am happy to test the problem, and if you give me ideas of where to look for the issue, I am willing to try to figure it out.

Thanks,

Rob

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-rt 2.6.31.10.12
ProcVersionSignature: Ubuntu 2.6.31-10.153-rt
Uname: Linux 2.6.31-10-rt i686
Architecture: i386
Date: Fri May 14 15:17:10 2010
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: linux-meta-rt

[Alessio Igor Bogani (abogani)]

Hi Rob,

Could you check this bug against this (https://launchpad.net/~abogani/+archive/broken/+files/linux-image-2.6.31-11-
rt_2.6.31-11.154_i386.deb), please?

Thanks!

[Rob Frohne (frohro)]

Hi Alessio,

That kernel works fine. Thanks for your work on this!

Rob

[Alessio Igor Bogani (abogani)]

Review requested and obtained from Ubuntu Kernel Team:
https://lists.ubuntu.com/archives/kernel-team/2010-May/010543.html

Packages are available on this PPA:
https://launchpad.net/~abogani/+archive/broken/+packages

[Rob Frohne (frohro)]

Thanks Allessio!

Rob