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Chapter 16 Connecting Devices
To troubleshoot ECR errors for parallel ports
1 Rebootthehost.
2Earlyinthebootprocess,pressandholddowntheDeletekeytoenterthehost
computer’sBIOSconfigurationeditor.
3FindtheparallelportfieldandenableExtendedCapabilityPort(ECP)modeora
combinationofmodesthatincludesECP.
MostmoderncomputerssupportECPmode.
Configuring a Parallel Port on a Linux Host
Foraparallelporttoworkproperlyinaguest,itmustfirstbeconfiguredproperlyon
thehost.Mostproblemswithparallelportsarecausedbymistakesinthehost
configuration.
Linuxkernelsinthe2.6.xseriesuseaspecialarbitratorforaccesstotheparallelport
hardwar e.Ifthehostisusi
ngtheparallelport,thevirtualmachinecannotuseit.Ifa
virtualmachineisusingtheparallelport,thehostandanyusersaccessingthehostare
deniedaccesstothedevice.YoumustusetheVM>RemovableDevicesmenuto
disconnecttheparallelportfromthevirtualmach
inetoaccessthedevicefromthehost.
Configure Parallel Ports for Linux 2.6.x Kernels
The2.6.xkernelsthatsupportparallelportsusethemodprobe <modulename>and
modprobe parport_pcmodules.WorkstationrequiresthattheparallelportPC‐style
hardwar eoption(CONFIG_PARPORT_PC)bebuiltandloadedasakernelmodule.
Thatis,itmustbesettom.
To configure parallel ports for Linux 2.6.x kernels
1Todeterminewhetherthemodprobe <modulename>and modprobe parport_pc
modulesareinstalledandlo
adedonyou
rsystem,runthelsmodcommandasthe
rootuser.
Youcanalsolookatthe/proc/modulesfileforthelist.
With2.6.x,loadingparport_pcdoesnotloadallmodules.
2Ifnoneofthelistedparallelportmodulesisloaded,usethefollowingcommand:
modprobe parport_pc && modprobe ppdev
Thiscommandinsertsthemodulesneededforaparallelport.
Ifproblemspersist,thelpmodulemightbeloaded.Ifitis,thevirtualmachine
cannotusetheparallelportcorrectly.
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