Difference between revisions of "USB-UIRT x86 Fix"

Revision as of 14:57, 21 July 2008

So, you have just received that $60 (or more) USB-UIRT, and you go ahead and plug it in, and learn all of your codes, reload the router and ..... Nothing Happens. You can see the light flashing, but your channels aren't changing. Now What? Below is the fix to get your shiny new USB-UIRT to work, if you have not yet purchased any IR dongles for the units blaster.

Firstly a disclaimer. The USB-UIRT can in fact blast under its own power, however, to get this unit to function flawlessly, you should also purchase additional IR dongles or heads. A good source of these both single and dual headed is from : Smarthome.com If you use these, not only will the UIRT be more accurate and reliable, but it will also be fully supported by the stock LMCE.

Now onto the fix:

What is required

1. Alternate build environment

2. Original Ubuntu-Gutsy kernel tree

3. 30 minutes to an hour of your time (spoiler at the end)

Alternate Build Environment

Get the necessary build tools

sudo apt-get update
sudo apt-get install linux-kernel-devel fakeroot build-essential libncurses5 libncurses5-dev

Get the ubuntu-gutsy source tree - we will do the following as user root

sudo -i
cd /usr/src
git clone git://kernel.ubuntu.com/ubuntu/ubuntu-gutsy.git ubuntu-gutsy

This step takes a while, but when it is done you should end up with

/usr/src/ubuntu-gutsy

Change the module file

This is best done with the 'vi' command line editor

vi /usr/src/ubuntu-gutsy/drivers/usb/serial/ftdi_sio.c

Use the "/" key to open a search dialog. In this dialog type:

ftdi_tiocmget

You are looking for a line that reads

ftdi_tiocmget(struct usb_serial_port *port, struct file *file)

I believe this was the third thing after typing an additional "/" (vi remembers your last search, so to get to the second entry in the file simply hit the "/" again, and press enter) After you have located the entry, look for the line that has

case FT2232C: 

(hint use the "/" key, as this may be a bit down the file) Now after arrowing down to this line hit the "O" key to open a new line directly below the FT232RL line, press "TAB" and enter

case FT232RL:

Now save the file by doing a

:wq!

That is <shift :>wq! Now the file has been modified. And if you have never used it, you just got a crash course in 'vi' :)

Compile the kernel

This next step may take a while, mine took about 30 minutes to compile, YMMV! :)

Again as user root

cd /usr/src/ubuntu-gutsy

Copy over your running config file

cp -vi /boot/config-`uname -r` .config

Now fire up the ncurses compiler menu

make menuconfig

Here is a note, unless you know what you are doing, do not change anything here. You don't actually need to change the kernel config, you just need to load it so that the new USB-UIRT module is compiled correctly!!!!!!!!!

With that said, arrow down to the menu entry that says:

Load an Alternate Configuration File

Hit enter and verify ".config" shows up. Then select "OK" Now "TAB" over to "Exit" and hit "Enter"

Ok, now get yourself a cool beverage, and watch your favorite sit-com, because this may take anywhere from 30 to 45 minutes to complete!

make

Please wait for this to complete before proceeding ;)

Backing up and copying over the new module

After the compile has completed (Congratulations you may have just compiled your first kernel), we need to make a back up copy of your existing USB-UIRT module, in case something goes wrong in the next few steps, you will have a fallback.

Copy the original file to a backup file:

cp /lib/modules/2.6.22-14-generic/kernel/drivers/usb/serial/ftdi_sio.ko /lib/modules/2.6.22-14-generic/kernel/drivers/usb/serial/ftdi_sio.ko.backup

Copy the new file over to your running modules folder:

cp /usr/src/ubuntu-gutsy/drivers/usb/serial/ftdi_sio.ko /lib/modules/2.6.22-14-generic/kernel/drivers/usb/serial/ftdi_sio.ko 

OK. Now the new file has been copied to the running modules folder.

Rebooting And/Or Reloading the Module

1. "The Sure Thing"

reboot the box

2. "A Possible alternative (though not tested by myself)

rmmod ftdi_sio
modprobe ftdi_sio

I simply rebooted, but it is possible to reload modules. To do this I would suggest unplugging the USB-UIRT from the USB port,running the above commands in the order shown, and then plugging it back in.

That's it your done. This resolved my issues, and now the USB-UIRT works with or without IR Blaster Dongles.

The Spoiler

I have made available for download the completed module, if you use this, and it should work, you should not have to rebuild the kernel, simply follow the steps from number 5 on. The module is here as a tar file ftdi_sio.ko.tar

You may certainly try this, although I have not tested it myself, as long as your kernel is 2.6.22-14-generic it should work check this by doing a

uname -r

Well let me know if this helps anyone, and by all means if you find a better way, modify this wiki.

Special thanks to eNoodle, linuxmjb, and collinjones for gathering together the necessary bits for the fix. This is merely a howto using information they researched. Kudos guys.

Regards,

Seth