Hi,
The Cortex-A devices are typically used together with Linux and hence require a special Linux toolchain built for the exact distribution/configuration that is running on the target.
We provide toolchains for the most commonly used Cortex-A boards (e.g. Raspberry Pi, Beaglebone). If you are using a different board, please check the board vendor for a cross-toolchain.
If you are looking for a barebone environment (without Linux), please try creating a project manually as shown in this tutorial: https://visualgdb.com/tutorials/arm/legacy/