# Distro (Linux Ubuntu)
Source: [https://docs.qualcomm.com/doc/80-88500-2/topic/10_Distro.html](https://docs.qualcomm.com/doc/80-88500-2/topic/10_Distro.html)
There are several distributions and every distribution has a configuration file. Distribution configuration files are in conf/distro directory within the metadata that contains the distribution configuration. Default distributions supported by the Qualcomm Linux Ubuntu are maintained in <workspace>/poky/meta-qti-bsp/conf/distro/ directory. However, the distribution configuration file of the Qualcomm Robotics RB5 device is at <workspace>/poky/meta-qti-ubuntu/conf/distro directory.
- Default distributions: These distros are classified into three types, `debug`, `perf`, and `user`, and address the different development cycle needs. These distros are an amalgamation of upstream and proprietary BSPs, user space modules, and applications that you can extend.
The following distros are defined in the Qualcomm Linux Ubuntu:
- Console distros
| `qti-distro-debug` | `qti-distro-perf` | `qti-distro-user` |
| --- | --- | --- |
|
- Default debug-oriented build
- Contains the debug-enabled kernel
defconfig
- Supports extended logging
- Supports serial console
|
- Performance-oriented build
- Support limited logging
- No serial consoles
- Uses the kernel
perf defconfig
|
- Product deployment-oriented build
- Contains all logging-related features as the
perf distro build with additional security restrictions
- Debug utilities, for example, Diag, are absent
|
- Multimedia fullstack distros
| `qti-distro-fullstack-debug` | `qti-distro-fullstack-perf` | `qti-distro-fullstack-user` |
| --- | --- | --- |
|
- Enables multimedia, that is, Wayland, Weston, PulseAudio, TensorFlow Lite, audio, and Bluetooth
- Uses the debug-enabled kernel
defconfig
- Supports extended logging
- Supports UART serial console
|
- Enables multimedia in the performance mode
- Supports limited logging
- No UART serial console
- Uses the kernel
perf defconfig
|
- Product deployment-oriented build
- Contains all logging related features as the
perf distro build with additional security restrictions
- Debug utilities, for example, diag, are absent
|
- Qualcomm Robotics RB5 Platform distributions: These distribution files can be found in the `meta-qti-ubuntu` layer.
For example, for the qti-distro-ubuntu-debug.conf, the configuration includes the qti-distro-base.inc for certain base configurations.
Note: For more information on these variables, see [https://docs.yoctoproject.org/ref-manual/variables.html](https://docs.yoctoproject.org/ref-manual/variables.html).
- `TCMODE` specifies the toolchain selector and controls the characteristics of the generated packages and images by notifying the OpenEmbedded build system as to which toolchain profile to use. If an external toolchain is used, it is primarily controlled with the `TCMODE` variable as it is flexible and customizable.
- `TCLIBC` controls the variant of the GNU standard C library, `libc`, used during the build process, that is, `glibc` or `musl`. For the Qualcomm Robotics RB5 device, `glibc` is used.
- `PACKAGE_CLASSES` specifies the package manager that the OpenEmbedded build system uses when packaging the data. In this case, the OpenEmbedded build system uses the `deb` package manager to create the image or SDK as shown in the following figure:
- **[Add a distro configuration](https://docs.qualcomm.com/doc/80-88500-2/topic/11_Add_a_distro_configuration.html)**
**Parent Topic:** [Build system](https://docs.qualcomm.com/doc/80-88500-2/topic/4_Qualcomm_Robotics_RB5_build_system.html)
Last Published: Aug 18, 2023
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