USB-Blaster 2.6 kernel problem

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originally posted by hippo@Dec 27 2006, 09:00 PM

actually, fc6 might detect jtag without changing udev rules. the jtag got detected sometime with root account. i have to disable selinux to run nios2-configure-sof. i tried changing the mode to 0666 in 50-udev.rules to get user access. sometime it works, but mostly fails.

there is no /etc/hotplug dir in fc6. the /etc/udev rules changed a lot from rhel4. in fc6, the udev add the jtag as /dev/bus/usb/004/002 dev, the bus number may be different for different usb ports. i think you should not name the dev as "usbblaster".

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It seems i ran into most of the problems above with my FC6 install, but i believe i discovered a solution to the flakyness of jtagconfig runnning as a user and getting invalid port permissions.

I am still not sure of the cause, but running the JTAGD as a service (IE: as root without the typical --user-launch option (i think the name is wrong) that is used when running jtagconfig directly without jtagd running) resolves the issue. I can now consistently use the usbblaster in my fresh FC6 install.

first, change the udev rules to allow users access to the usbblaster

I created a new udev rule in /etc/udev/rules.d called usbblaster.rules

BUS=="usb", SYSFS{product}=="USB-Blaster", SYMLINK+="usbblaster", MODE="0666"

**NB this rule does not handle plugging in multiple USB Blasters, i didn&#39;t care as i only use one.. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif

next, i created and initscript for jtagd :

# !/bin/bash# # Init file for Altera JTAGD# # chkconfig: 2345 60 25# description: JTAG daemon# # processname: jtagd# config: /etc/jtagd

# source function library

. /etc/rc.d/init.d/functions

RETVAL=0

prog="jtagd"

PID_FILE=/var/run/jtagd.pid

JTAGD=/opt/altera6.1/quartus/bin/jtagd

start()

{

echo -n $"Starting $prog: "

$JTAGD && success || failure

RETVAL=$?

pidofproc $prog >> $PID_FILE

echo

}

stop()

{

echo -n $"Stopping $prog: "

if [ -n "`pidfileofproc $JTAGD`" ] ; then

killproc $JTAGD

else

failure $"Stopping $prog"

fi

echo

}

case "$1" in

start)

start

;;

stop)

stop

;;

restart)

stop

start

;;

*)

echo $"Usage: $0 {start|stop|restart}"

RETVAL=1

esac

exit $RETVAL

set the permissions, add it to all the runlevels (chkconfig --add jtagd)

don&#39;t forget to change the path to the JTAGD to match your install path.

The next step is to create the /etc/jtagd and put the pgm_parts stuff in it so all the parts would be recognized correctly.

# mkdir /etc/jtagd # cp /opt/altera6.1/quartus/linux/pgm_parts.txt /etc/jtagd

and then there seemed to be some confusion as to what this file should be named, so i shotgunned it and used them all

# ln -s /etc/pgm_parts.txt /etc/jtagd/pgm_parts# ln -s /etc/pgm_parts.txt /etc/jtagd/jtagd.pgm_parts

start the service as root# /etc/init.d/jtagd start

and TADA!! everything magically works.

--dalon