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# 4. Customizing images with AMD Features
AMD supports various features and software components that can be
enabled by setting the corresponding configuration variable to a
valid value in the `local.conf`.
Following is a list of components that can be enabled if you want
them to be installed/available on your image, or can be configured:
* **ON-TARGET DEVELOPMENT - SDK for on-target development**
> gcc, make, autotools, autoconf, build-essential etc.
* **ON-TARGET DEBUGGING - tools for on-target debugging**
> gdb, gdbserver, strace, mtrace
* **ON-TARGET PROFILING - tools for on-target profiling**
> lttng, babeltrace, systemtap, powertop, valgrind
* **RT KERNEL - Realtime Kernel support**
> Linux kernel with PREEMPT_RT patch
---
##### Note
Please set the required configuration variables as shown below in the
`local.conf` **before building an image or generating an SDK** (that
can be used to develop apps for these components (if applicable)).
Otherwise they will not be configured, and will not be available on the
target.
---
#### Supported software features
| Software feature | Configuration variable | Configuration values | Default value | Supported machines |
|:----------------------|:----------------------------------|:----------------------------|:--------------|:-------------------|
| ON-TARGET DEVELOPMENT | EXTRA_IMAGE_FEATURES:append | tools-sdk | | all |
| ON-TARGET DEBUGGING | EXTRA_IMAGE_FEATURES:append | tools-debug | | all |
| ON-TARGET PROFILING | EXTRA_IMAGE_FEATURES:append | tools-profile | | all |
| RT KERNEL | PREFERRED_PROVIDER_virtual/kernel | linux-yocto, linux-yocto-rt | linux-yocto | all |
#### Example configuration in local.conf
```sh
EXTRA_IMAGE_FEATURES:append = " tools-sdk"
EXTRA_IMAGE_FEATURES:append = " tools-debug"
EXTRA_IMAGE_FEATURES:append = " tools-profile"
# Please run 'bitbake -c clean virtual/kernel' everytime before
# configuring the PREFERRED_PROVIDER_virtual/kernel variable
PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt"
```
If you use the iso image, you can choose to `boot` from iso directly, or
to `install` the system to existing hard drive.
By default, the user interactive console is the serial port.
To install from vga console, edit the platform config file of you machine
`meta-amd-bsp/conf/machine/include/<platform>.inc`
and set tty0 as the last console option of the `APPEND` variable.
Example:
```
Set `APPEND += "console=tty0 console=ttyS0,115200n8"` to install from serial console.
Set `APPEND += "console=ttyS0,115200n8 console=tty0"` to install from vga console.
```
---
#### What's next
Continue to "Section 2 - Setting up and starting a build"
([BUILD.md](BUILD.md#23-start-the-build)) and restart the image build
as `bitbake <image-name>`, and deploy the new image to see the
changes take effect.
|
