kern/103137: Rocketport driver is broken in 6.x
karl at denninger.net
Mon Sep 11 07:20:18 PDT 2006
>Synopsis: Rocketport driver is broken in 6.x
>Arrival-Date: Mon Sep 11 14:20:16 GMT 2006
>Originator: Karl Denninger
>Release: FreeBSD 6.1-STABLE i386
Karls Sushi and Packet Smashers
System: FreeBSD FS.denninger.net 6.1-STABLE FreeBSD 6.1-STABLE #0: Sat Sep 9 13:43:22 CDT 2006 karl at FS.denninger.net:/usr/obj/usr/src/sys/KSD-SMP i386
The Comtrol Rocketport driver is severely broken from FreeBSD
6.1-RELEASE forward, and likely on 6.0-RELEASE (not tested here.)
It will return multiple copies of the same data to a read(2) request
in a program, and often significantly delays (by a full second or
more) return of data that appears on the serial port to the
application. It behaves particularly poorly when the port is placed
in non-canonical mode and select(2) is used for multiplexing
between multiple sources of input in an application.
For all intents and purposes the driver is, in its present state,
The driver was stable and fully functional under 5.x.
Tested on the PCI/4 version of the card.
The Comtrol boards should be removed immediately from the "supported
hardware" list, or marked as "broken", until this can be rectified.
Put a Comtrol Rocketport in a FreeBSD 6.x system and enable the
Note that you cannot use the ports for communication as expected.
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