Understanding Driver Conflicts
Driver conflicts for the XDS110 debug probe on Linux systems can be particularly challenging for firmware developers. These conflicts often arise due to multiple drivers attempting to manage the same USB interface, resulting in failures or unexpected behavior. In the case of XDS110 from Texas Instruments, it is essential to identify and resolve these conflicts to ensure smooth debugging and communication with your device.
Identifying Conflicting Drivers
Conflicting drivers can prevent Linux from properly recognizing or interacting with your XDS110. To identify such conflicts:
Use the lsusb command to list USB devices and verify the XDS110 is connected. Look for a line containing "Texas Instruments XDS110".
```bash
lsusb | grep "Texas Instruments"
```
Find out which drivers are loaded for a specific USB device using the usb-devices command:
```bash
usb-devices | awk '/T: Bus=/{gsub("Bus=", "", $0); bus=$0} /D: Dev#=/{gsub("Dev#=", "", $0); dev=$0} /S: Manufacturer=Texas Instruments/{print bus "-" dev}'
```
Leverage dmesg to inspect system messages for any indications of conflicts or issues:
```bash
dmesg | grep -i xds110
```
Configuring udev Rules
If your system isn't correctly recognizing the XDS110, you might need to create or modify udev rules. This ensures the correct permissions and rights are applied to the device:
Create a new udev rule file named, for example, 99-xds110.rules:
```bash
sudo nano /etc/udev/rules.d/99-xds110.rules
```
Add the following lines to create appropriate permissions for your device. Adjust the MODE as necessary.
```
SUBSYSTEM=="usb", ATTRS{idVendor}=="0451", ATTRS{idProduct}=="bef3", MODE="0666"
SUBSYSTEM=="usb_device", ATTRS{idVendor}=="0451", ATTRS{idProduct}=="bef3", MODE="0666"
```
Reload the udev rules to apply changes:
```bash
sudo udevadm control --reload-rules
sudo udevadm trigger
```
Blacklisting Conflicting Drivers
Sometimes, you might need to blacklist specific drivers that conflict with the XDS110:
Find all currently loaded modules to identify potentially conflicting ones:
```bash
lsmod
```
Edit the blacklist configuration file to prevent these from loading automatically:
```bash
sudo nano /etc/modprobe.d/blacklist.conf
```
Add the entry for each module you wish to blacklist, such as:
```
blacklist <module_name>
```
Testing and Verification
Once you've made these changes, plug in the XDS110 again and verify that it is correctly detected without conflicts:
Use lsusb to confirm the device is being recognized properly.
```bash
lsusb | grep "Texas Instruments"
```
Use Texas Instruments' xds110reset or xds110probe tools to test the connection:
```bash
xds110reset
xds110probe
```
By following these steps and using diagnostic commands, a firmware developer can effectively manage and resolve driver conflicts for the XDS110 on Linux systems. These practices ensure efficient debugging and interaction with your development environment.
