Red Hat Bugzilla – Bug 147068
Can't write to PCI board Serial Port
Last modified: 2015-01-04 17:16:29 EST
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Description of problem:
With a US Robotics Faxmodem 56k model 5610,
attempta by a user process to write to the UART
fail, resulting in an error return.
This problem appeared after the 681 version.
Versions from RH9 to 681 do not have this problem.
Opening the serial port and setting the speed do not
The motherboard serial port sends characters normally.
This problem is seen with two 5610 boards. Both work in
older versions, neither works with versions >681.
p.s. Opening a serial port whose hardware does not exist
should return an error. Beyond that, it should not be
possible to set speed on a port that doesn't exist.
Version-Release number of selected component (if applicable):
Fedora Core subsequent to 681
Steps to Reproduce:
1.Install 5610 hardware modem PCI card
2.open port, set speed
3. Write to the port
Actual Results: write error errno=5
Expected Results: Should send characters to the modem
An update has been released for Fedora Core 3 (kernel-2.6.12-1.1372_FC3) which
may contain a fix for your problem. Please update to this new kernel, and
report whether or not it fixes your problem.
If you have updated to Fedora Core 4 since this bug was opened, and the problem
still occurs with the latest updates for that release, please change the version
field of this bug to 'fc4'.
Not a bug per se. The new version remapped TTYS4 to TTYS14.
The modem is alive and well at TTYS14.