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# HALs
HALs are known as json files in 4a, they are stored in **/usr/libexec/agl/4a-hal**.
Enabled HALs can be found in the **etc** subfolder, and disabled HALs in **etc.available**.
You can enable and disable HALs just by moving the corresponding json file from one folder to the other.
Example:
```bash
user@machine$ ls etc etc.available/
etc:
hal-4a-csl-cm106-8ch-usb.json
etc.available/:
hal-4a-2ch-generic-usb.json hal-4a-intel.json hal-4a-rcar-m3.json
hal-4a-ensoniq.json hal-4a-jabra.json hal-4a-rcar-m3kf.json
hal-4a-intel-minnow.json hal-4a-m3ulcbkf-radio-to-2ch.json
hal-4a-intel-qemu.json hal-4a-raspberry-pi-3.json
user@machine$ mv etc/hal-4a-csl-cm106-8ch-usb.json etc.available
user@machine$ mv etc.available/hal-4a-2ch-generic-usb.json etc
user@machine$ ls etc etc.available/
etc:
hal-4a-2ch-generic-usb.json
etc.available/:
hal-4a-csl-cm106-8ch-usb.json hal-4a-intel.json hal-4a-rcar-m3.json
hal-4a-ensoniq.json hal-4a-jabra.json hal-4a-rcar-m3kf.json
hal-4a-intel-minnow.json hal-4a-m3ulcbkf-radio-to-2ch.json
hal-4a-intel-qemu.json hal-4a-raspberry-pi-3.json
user@machine$ sync
user@machine$ reboot
```
>NOTE: Even if multiple HAL are allowed, you have to make sure that they don't provide the same streams, because it will cause a race condition in the high level API. The first HAL providing the stream is used, any other are ignored.
>
>Also, the hardware used by enabled HALs should be available.
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