[Linux-parport] parport driver unable to detect hardware EPP

Abhay Tayar abhaytayar at gmail.com
Mon Mar 23 06:35:09 EDT 2009


I have written an application that communicates over EPP. It is well tested.
It fails on certain system and my investigation revealed that although EPP
is supported by the hardware, it is not showing up as one of the supported
modes of the parport driver.

I have 3 linux systems.
System A is 32 bit IBM machine with RHEL5 (kernel: 2.6.18-8.el5).
System B is 32 bit Dell machine with RHEL5 (kernel: 2.6.18-8.el5xen)
System C is 64 bit Dell machine with RHEL5 (kernel:

All above systems has EPP selected in BIOS.
When I execute the code it runs fine on System A but does not run as
expected on System B and System C.

cat/proc/sys/dev/parport/parport0/modes on System A shows EPP,SPP,TRISTATE.
On system B and System C, EPP is not shown in the list.

How to figure out the parport driver version? I am not much of a linux guy.
I do not know what command to use for the same.
Does the parport driver have a installer? I tried looking up over the
internet but did not find any.
What should I do, so that the EPP is supported on System B and System C too?

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